SAND91-7031, 'Mineralogy, Petrology and Whole-Rock ... · studies, electron microprobe analysis and scanning electron microscopy. The sections used in the work presented here were

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SAND91-7031Unlimited ReleaseUC-814

Yucca Mountain Site Characterization Project

Mineralogy, Petrology and Whole-RockChemistry Data Compilation for SelectedSamples of Yucca Mountain Tuffs

James R. ConnollyDepartment of Geology and Institute of MeteoriticsUniversity of New MexicoAlbuquerque, NM 87131

Prepared by Sandia National Laboratories Albuquerque, New Mexico 87185and Livermore. California 94550 for the United States Department of Energyunder Contract DE-AC04-76DP00789

Printed December 1991

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SAND91-7031Unlimited Release

Printed: December, 1991

Mineralogy, Petrology and Whole-Rock Chemistry Data Compilationfor Selected Samples of Yucca Mountain Tuffs

James R. Connolly

Department of Geology and Institute of MeteoriticsUniversity of New Mexico, Albuquerque, New Mexico 87131

ABSTRACT

Petrologic, bulk chemical, and mineralogic data are presented for49 samples of tuffaceous rocks from core holes USW G-1 and UE-25a#1 at Yucca Mountain, Nevada. Included, in descending strati-graphic order, are 11 samples from the Topopah Spring Member ofthe Paintbrush Tuff, 12 samples from the Tuffaceous Beds ofCalico Hills, 3 samples from the Prow Pass Member of the CraterFlat Tuff, 20 samples from the Bullfrog Member of the Crater FlatTuff and 3 samples from the Tram Member of the Crater Flat Tuff.The suite of samples contains a wide variety of petrologic types,including zeolitized, glassy, and devitrified tuffs. Data varyconsiderably between groups of samples, and include thin sectiondescriptions (some with modal analyses for which uncertaintiesare estimated), electron microprobe analyses of mineral phasesand matrix, mineral identifications by X-ray diffraction, andmajor element analyses with uncertainty estimates.

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The work contained in this report was done within WBS Element

1.2.3.2.7.1.3.

I

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CONTENTS

Pacre1.0 INTRODUCTION .......................................... 12.0 OBJECTIVE ............................................. 33.0 ANALYTICAL TECHNIQUES AND ASSOCIATED UNCERTAINTIES .... 4

3.1 Petrography .. 43.1.1 Methods ...................................... 43.1.2 Uncertainties ............................... 5

3.2 Whole-Rock Analyses . . 63.2.1 Methods...6...... I... 63.2.2 Uncertainties ............................... 7

3.3 X-Ray Diffraction ................................. 83.3.1 Methods.. 83.3.2 Uncertainties ................................ 9

3.4 Electron Microprobe Analysis . . 93.4.1 Methods.. 93.4.2 Uncertainties ............................... 10

4.0 SUMMARY OF SAMPLE CHARACTERISTICS . .................... ll4.14.24.34.44.54.64.74.84.94.104.114.124.134.144.154.164.174. 184.194.204.214.224.234.244.254.264. 274.28

USW G-1 407.1........USW G-1 448.9........USW G-1 504.6........USW G-1 631.6........USW G-1 811.1........USW G-1 939.0........USW G-1 1079.4.......USW G-1 1208.7.......USW G-1 1245.........USW G-1 1315.2.USW G-1 1374.0.USW G-1 1442.0.USW G-1 1487.4.USW G-1 1519.9.USW G-1 1550.4.USW G-1 1594.8.UE-25a#1 1569.......USW G-1 1617.0.USW G-1 1665.5.USW G-1 1668.5.USW G-1 1719.7.USW G-1 1741.8.USW G-1 1784.8.UE-25a#1 2000.......USW G-1 2067........USW G-1 2170........USW G-1 2274........USW G-1 2276........

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.......................... 12

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......... ...... ........ 16

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4.29 USW G-1 2284........4.30 UE-25a#1 2389.......4.31 UE-25a#l 2429.......4.32 USW G-1 2312........4.33 USW G-1 2338........

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I

4.34 UE-25a#1 2499 .............. .. 284.35 USW G-1 2367 .. .............. 294.36 USW G-1 2380 .. .............. 294.37 USW G-1 2406 .. .............. 304.38 USW G-1 2415 .. .............. 304.39 USW G-1 2428 .. .............. 314.40 USW G-1 2493 .. .............. 314.41 USW G-1 2502 .. .............. 324.42 USW G-1 2510 .. .............. 324.43 USW G-1 2538 .. .............. 334.44 USW G-1 2550 .. .............. 334.45 USW G-1 2563 .. .............. 344.46 USW G-1 2585 .. .............. 344.47 USW G-1 2658 .. .............. 354.48 USW G-1 2928.6 .. .............. 354.49 USW G-1 2939.3 .. .............. 36

5.0 REFERENCES .. . 38

APPENDIX A Data Compilation for Thin Section Analyses .... 40APPENDIX B Data Compilation for Whole-Rock

Chemical Analyses .. 80APPENDIX C Data Compilation for Qualitative X-ray

Diffraction Analyses .. 86APPENDIX D Data Compilation for Electron Microprobe

Analyses .. 92APPENDIX E Applicability to Reference Information Base

and Site and Engineering Properties Data Base.... 138

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ILLUSTRATIONS

Figure Title

1 Location of the Nevada Test Site, YuccaMountain, and Existing Deep Coreholes.

Page

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2

Page

TABLES

Table Title

1 Technical Procedures Referred to in Text 3

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1.0 INTRODUCTION

This document reports the results of petrologic, chemical (whole-rock and electron microprobe), and mineralogic analyses of rocksamples from the deep coreholes UE-25af1 and USW G-1 at YuccaMountain, Nevada (Figure 1). The work was performed in theDepartment of Geology and Institute of Meteoritics IOM) at theUniversity of New Mexico (UNM), and was completed in support ofthe Yucca Mountain Site Characterization Project (YMP), which isadministered by the Nevada Operations Office of the U.S. Depart-ment of Energy. The work was directed by verbal instructionsfrom Allen R. Lappin of Sandia National Laboratories (SNL) toKlaus Keil and the author between about June, 1981 and December,1983. Data were obtained between about July, 1981 and August,1984.

The data were obtained prior to the development of a QualityAssurance (QA) plan for the YMP work, and no formal Nuclear WasteRepository Technology (NWRT) Department technical procedures(TPs) were followed. Procedures followed were those in use atthe time in the laboratory facilities at UNM, and in many cases,the procedures were functionally identical to those later imple-mented in TPs. All TPs referred to in the discussion of analyti-cal techniques (Section 3.0) are listed in Table 1.

The remainder of this report includes four sections. First, theobjectives of the study are stated briefly. Second, a discussionof the analytical techniques used and the methods employed toestimate uncertainties is presented. The third section is apartly descriptive and partly interpretive summary of the charac-teristics of each of the samples. In some cases, only descrip-tive data are available, and these are presented here; when quan-titative data were available (as tabulated in the appendices),limited interpretations of the data are presented. The last sec-tion is a series of appendices which present the thin sectionpetrographic data, the whole-rock analyses, qualitative X-raydiffraction results, and the electron microprobe analyses.

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.1

Figure 1: Location of the Nevada Test Site, Yucca Mountain, and

Existing Deep Coreholes

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Table 1

TECHNICAL PROCEDURES REFERRED TO IN TEXT

Title Number

Procedures for Laboratory Sample TP-59Petrology Determination

Procedures for Preparation of TP-60Polished Thin Sections

Procedures for Laboratory Sample TP-61Bulk Chemical Determination

2.0 OBJECTIVE

The purpose of this report is to present petrologic, mineralogic

and geochemical data obtained at UNM in support of the YMP which

have never been formally presented. This project has been for-

merly known as the Yucca Mountain Project and the Nevada Nuclear

Waste Storage Investigations (NNWSI) Project. In these early

stages of this work, a uniform approach to sample characteriza-

tion and analysis had not been developed, and different analyti-

cal techniques were applied to different suites of samples.

These analytical techniques included hand-sample descriptions,

thin section descriptions of varying detail (some with modal

analyses by point count), whole-rock chemical analysis, X-ray

diffraction to identify finely crystalline mineral phases, and

electron microprobe analysis to determine the chemical composi-

tion of constituent mineral phases and various types of matrix.

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3.0 ANALYTICAL TECHNIQUES AND ASSOCIATED UNCERTAINTIES

3.1 Petrography

3.1.1 Methods

3.1.1.1 Preparation of Polished Thin Sections

Polished thin sections of rocks are used in optical petrographicstudies, electron microprobe analysis and scanning electronmicroscopy. The sections used in the work presented here wereprepared prior to the development of formal procedures for prepa-ration of these sections (i.e., TP-60). All of the sectionsstudied here are round, 1 in. (2.54 cm) diameter glass slides,and were polished with 1 m (or finer) diamond paste to produce apolished surface acceptable for electron microprobe analysis(although all of the sections were not analyzed with the electronmicroprobe). The procedures used are generally the same as thosewhich were later incorporated into TP-60 with the exception ofsample custody and sample-preparation data-sheet requirements.

3.1.1.2 Petrographic Examination and Point Counting

The procedures used to examine the hand samples and thin sectionsdiscussed here were not formalized (in TP-59) until several yearsafter the work was completed. Lacking in the data for most ofthese samples are detailed hand-sample descriptions. For all but10 of the samples, detailed thin-section descriptions were pre-pared, in most cases including estimates of modal (volume per-cent) proportions of constituents by point count. For the onesample for which the modal proportions were estimated visually,the estimation was made by visual comparison utilizing thesize/proportion charts from Lof (1982). For the ten samples notdescribed in detail (USW G-1 407.1, USW G-1 448.9, USW G-l 504.6,USW G-1 631.6, USW G-l 811.1, USW G-1 939.0, USW G-1 1079.4, USWG-1 1208.7, USW G-1 1315.2, and USW G-1 1374.0), brief informaldescriptions were prepared. These data are summarized inAppendix A.

Optical petrographic study of polished thin sections was done inthe IOM using one of two Carl Zeiss Research Microscopes. Thesemicroscopes allow examination of sections in both transmitted andreflected light. Magnification range is between 31X and 50OX,

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.and a micrometer eyepiece is used to measure grain sizes. Themicrometer scale is a fixed, integral part of the microscope ocu-lar, and calibration of that scale has been done using a glassCarl Zeiss micrometer scale with scale divisions to 0.1 mm.Though not used to produce images for this study, microscopicfeatures of interest may be photographed with a 35mm camera builtinto one of the microscopes.

Detailed descriptions and modal analysis results (for all but theten samples mentioned above) were recorded on "Tuff Thin SectionDescription" forms. The data presented in Appendix A are summa-rized from these description forms. The complete data forms arein SNL-YMP Data Records Management System (DRMS) data base51/L04-4/19/90. Although these forms pre-date TP-59, that docu-ment's discussion of items included in a tuff sample descriptionapplies to work done on these samples.

Point counts were made using a Swift Model CD Automatic PointCounter with motorized mechanical stage (see TP-59 for details).The grid spacing for the point counts may be varied between 1/3mmand 1 1/3mm. The spacing used for individual section pointcounts was not recorded, but, in general, smaller grid sizes arerequired to produce the high number of points (typically about1000) counted on many of these samples. For all point counts,only the total number of points and the modal percentage (usuallyrounded to the nearest 1.0 percent or 0.5 percent) are availablefor reporting.

3.1.2 Uncertainties

Uncertainties can be estimated only for point counts. The uncer-tainties for thin-section point counts were calculated using themethod of Van der Plas and-Tobi (1965). The uncertainties shownin Appendix A are 2a standard deviations, calculated using thefollowing equation, giving 95% confidence that the actual amountis within the range of uncertainty given:

a = (p(100-p)/n)0 .5 (1)

where p = calculated content of a mineral in volume percent, andn = the total number of points counted.

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In those cases in which the uncertainty exceeds the amount

reported in the data sheets in Appendix A, the amount should beconsidered too low for accurate estimation. It must be empha-sized that the estimated uncertainties are for the particularthin sections counted. Tuffaceous volcanic rocks are commonlyinhomogeneous, and it is difficult to confirm that one or twosections can accurately represent the modal proportions of con-stituents in the sample as a whole. No uncertainty estimatescould be made for visually estimated modes.

The precision of these error estimates may be affected by theunavailability of the original counting data, and by the presenceof components which are significantly larger than the size of thegrid used for counting. These potential sources of error havenot been evaluated.

3.2 Whole-Rock Analyses

3.2.1 Methods

Although this work pre-dates the preparation of the technicalprocedure for major element whole-rock analyses (TP-61) by sev-eral years, the procedures followed were substantially the samethose described in TP-61, except as discussed in the followingsections.

3.2.1.1 Sample Preparation

Samples for whole-rock analyses are crushed to a fine powder(<100 mesh = <150 m). This is done by breaking the whole-rocksamples into small (pea-sized or smaller) pieces with a hardenedsteel mortar and pestle, followed by crushing in a tungsten-car-bide ball-mixer mill and passing the sample through a 100-meshnylon screen, using procedures to minimize any possibility ofsample contamination. TP-59, which post-dates this work, con-tains details of the sample crushing procedure which is substan-tially the same as those used in the preparation of the samplesdiscussed here.

3.2.1.2 Analytical Methods

Whole-rock chemical analyses are reported in Appendix B for fivesamples. These analyses were obtained in late 1981 in the Geo-

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chemistry Laboratory in the Department of Geology at the Univer-sity of New Mexico under the direction of staff chemist John W.Husler.

Weight percentages of TiO2, A10 3, total iron as Fea03, MnO, MgO,CaO, NapJ, and K were determined using atomic absorption spec-trophotometry (AA). The AA.procedures used are detailed in TP-61, Appendix C. Silica (as SiO2 ) was determined gravimetricallyusing the "Long Method" as detailed in TP-61, Appendix G. Phos-phorous (as P205) was determined by colorimetric spectrophotome-try, following procedures detailed in TP-61, Appendix H. Theproportions of ferrous iron (as FeO) and ferric iron (as Fea3)were determined volumetrically by titration with standard potas-sium dichromate, using sodium diphenylamine as an indicator, fol-lowing procedures detailed in TP-61, Appendix F. The amount ofunbound (pore) water (HP-) lost upon heating to 110*C and boundwater (H;O+) lost on ignition (LOI) at 1000C were determinedgravimetrically, following procedures detailed in TP-61, AppendixE.

Deviations from procedures detailed in TP-61 are not believed tohave affected the quality of the data produced. These deviationsare:

1. In-house standards traceable to internationally recognizedrock standards were used for the AA determinations; NationalInstitute of Standards and Technology (NIST)-certified rockstandards were not used. Standards were not independentlyrun as samples for a calibration check.

2. Strip charts, calibration curves, and laboratory notebookswere kept as detailed in TP-61, but have not been retained.

3. Multiple replicate analyses of standards were not done forFeO - Fe2O3 determinations.

4. Sample custody procedures were not implemented (and were notrequired) at the time this work was done.

3.2.2 Uncertainties

The criteria used for determining the accuracy of the analysesare that the analytical total for all components (for these sam-ples, io 2 , TiO2, AP 3, FeO, FePO3, MnO, MgO, CaO, Nap, K, P 5,Hp-, and H+) lie within the range of 99.0% and 101.0% byweight.

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Expected uncertainties are estimated for all components deter-mined (with the exception of H) as follows: For components 1wt% of the sample, the actual amount present should be within ±3%of the analyzed value. For components 0.1 wt% and <1 wt%, theactual amount present should be within ±10% of the analyzedvalue. For components 0.01% wt% and <0.1 wt%, the actual amountpresent should be within ±20% of the analyzed value. Componentsthat are <0.01 wt% are considered to be present in an amountbelow the reliable detection limit for the methods used toproduce the analysis.

For H20(+) and H(-), the method used for determination is indi-rect. The presence of volatile elements not explicitly deter-mined (i.e., C02, C1, F) may produce inaccuracies in addition tothe random variations inherent in the gravimetric loss-on-heatingand loss-on-ignition techniques. For this reason, based on theexperience of the analyst, the amounts of H20(+) and H20(-)reported are estimated to be correct within ±10% of the amountpresent if the amount is >1 wt%, and ±30% of the amount presentif the amount is <1 wt% and 0.1%. Amounts under 0.1 wt% areconsidered below the detection limit. The amount of H20(+)reported will include those volatile elements mentioned whichhave not been explicitly determined.

The errors discussed above have been calculated for the bulkchemical data and presented with the analyses in Appendix B.

3.3 X-Ray Diffraction

3.3.1 Methods

X-ray diffraction (XRD) of powdered samples was used to qualita-tively identify clay, zeolite and other minerals in several ofthe samples analyzed in 1981 (UE-25a#l 1569, UE-25a#l 2000, UE-25a#l 2429, USW G-1 1245, and USW G-l 2939.3). Analyses were byRobert Lowy and John W. Husler. Results of the analyses are sum-marized in Appendix C.

The fine grained fraction was separated from the powdered sample(Section 3.2.1.1) for analysis by standard floatation and set-tling procedures outlined by Carroll (1970). The wet powderedsample was spread evenly on a microscope slide and allowed todry. The slide was placed in an automated Phillips X-ray

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diffractometer and analyzed using nickel-filtered copper Ka radi-ation. Scan rates were 2 2 per minute, over the angular rangebetween 3 and 30°. If clays were identified in the initial run,samples were glycolated and rerun, and then heated to about 3000Cfor about an hour and rerun. X-ray peaks, in degrees 29, wererecorded with an automated goniometer and strip chart recorderfor all runs. X-ray peaks were marked and recorded. Zeoliteswere identified by comparing diffractometer patterns with pat-terns presented in Sheppard and Gude (1969). Quartz was identi-fied by the presence of a characteristic peak at 26.8°.Feldspars were identified by peaks or groups of peaks clusteredaround 250 and 28°. Clay minerals were identified by the pres-ence of peaks at 6.2@ which shift to about 8 upon heating(montmorillonite), 8.8° (illite), broad peaks in the 6 to 8°range which shift to lower values upon heating (illite-montmorillonite), 6.2° and 24.8° peaks which shift less thanmontmorillonite upon heating (chlorite), and peaks at 12.4° and24.8° which do not shift upon heating at less than 400°C(kaolinite). The original data were reexamined by the author in1990, and original results reevaluated, resulting in the identi-fication of opal-CT (21.8° 2e), and re-evaluation of the abun-dance of some of the clay minerals based on peak intensities.

The XRD data are qualitative, and relative amounts given arerough estimates based on visual estimation of peak intensities inthe strip charts.

3.3.2 Uncertainties

XRD data are qualitative. No estimate of uncertainties can bemade.

3.4 Electron Microprobe Analysis

3.4.1 Methods

Chemical analyses of minerals and "bulk" analyses of polycrys-talline matrix material were made using an electron microprobe.An automated ARL-EMX-SM electron microprobe was used for thesuite df samples analyzed in 1981 (UE-25a#1l 1569, UE-25a#1 2000,UE-25a#1 2389, UE-25a#1 2429, UE-25a#1 2499, USW G-1 1245, USW G-1 2928.6, and USW G-1 2939.3), and an automated five-spectrometerJEOL 733 Superprobe was used for analyses made in 1984 (USW G-1

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407.1, USW G-1 448.9, USW G-1 504.6, USW G-1 631.6, USW G-1811.1, USW G-1 939.0, USW G-1 1079.4, USW G-1 1208.7, USW G-11315.2). Analyses on both instruments were made by wavelengthdispersive techniques, using a 15 kV acceleration potential andvarious beam currents. Feldspars, matrix and glass were analyzedwith 0.01 microamp currents, and mafic silicates and oxides wereanalyzed with 0.02 microamp currents. A broad (10- to 15-micron-diameter) electron beam was used for most analyses to minimizeheating and volatilization in samples during analyses. For anal-yses on the ARL instrument, time-decay for sodium and potassiumwas tested for analyses of glass and zeolitized matrix by count-ing Na and K over 2 second intervals for a period of 60 secondsor more; results showed that no notable loss occurred over thistime interval. At the time these data were collected, the JEOL733 Superprobe was automated by the SANDIA TASK-83 electronmicroprobe automation package (Chambers, 1983, unpublished man-script); this package was replaced in 1985 and later by enhancedversions of the program (Chambers, 1985; Chambers and Doyle,1990) which enhance the performance of the system, but do theanalytical calculations in an identical manner to SANDIA TASK-83.Volatilization checks for Na and K were not done for analysesperformed on this instrument. Differential matrix effects onboth instruments were corrected by the method of Bence and Albee(1968), as implemented in the automation software used to reducethe data.

Various feldspars, synthetic glasses, pyroxenes, and oxides wereused as standards. The standards used are ones which are rou-tinely used in these instruments and are, in general, widely usedin numerous electron microprobe laboratories. Replicate analysesof the standards and consensus analyses are kept on file in theelectron microprobe laboratory.

3.4.2 Uncertainties

Uncertainties involved in the individual analyses are calculatedby the software used to operate the instruments and collect thedata. These uncertainties are not presented in tables of indi-vidual analyses (Appendix D), but are included in the originaldata printouts in the appropriate DRMS data sets. The standarddeviations shown on the original data printouts from the ARLinstrument are sample standard deviations (N-1 weighting) calcu-

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lated based on sample counts for each element/oxide determinationas discussed by Goldstein et al. (1981, p. 430-431). For analy-ses with the JEOL instrument, these standard deviations are cal-culated in the same manner as discussed by Goldstein et al.(1981) as implemented by Chambers (1990; p. 97-100). These cal-culated standard deviations are an accurate measure of sampleuncertainties only when all other conditions are optimal (no ran-dom electronic variations, perfect specimen position, perfectcrystal detector position, etc.). For this reason, the actualuncertainties almost always will be larger than what is calcu-lated.

The only uncertainties shown in the data in Appendix D are stan-dard deviations calculated for the multiple analyses of matrix.These are calculated using a hand-calculator, applying the fol-lowing formula for sample standard deviation, s:

n

= ( (X - Xm) 2 /(n - ))°5 (2)i=1

where n = the number of points analyzed in the groupX = individual analyzed amount in wt percent, and

Xm = mean of n individual analyses in wt percent.

The ± values shown in the data tables in Appendix D indicate arange of uncertainty with about 68% confidence; the variation ofthe size of these values are a measure of the chemical homogene-ity of the analyzed areas.

4.0 SUMMARY OF SAMPLE CHARACTERISTICS

The following sections contain brief descriptions of each sampleanalyzed for this study. The descriptions are interpretive inthe sense that there is an attempt to integrate whatever analyti-cal data are available to deduce information about each sample asa whole. Because the amount and quality of data vary betweensamples, the discussions are quite variable. Each discussion ispreceded by a geologic map acronym for the stratigraphic unit ofthe sample and a listing of the types of data used to make theinterpretations. The acronyms used are as follows:

Tpt - Topopah Spring Member of the Paintbrush Tuff.

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Tht - Tuffaceous Beds of Calico Hills.

Tcp - Prow Pass Member of the Crater Flat Tuff.Tcb - Bullfrog Member of the Crater Flat Tuff.Tct - Tram Member of the Crater Flat Tuff

The samples are listed in the following sections in descendingstratigraphic order. All samples are from drill core. The sam-ple numbers are the drill hole designation followed by the depth(in feet) from which the sample was obtained. The stratigraphicunit to which the sample is assigned is based on published posi-tioning of contacts between rock units in Spengler et al. (1979)for UE-25a#l, and Spengler et al. (1981) for USW G-1. Althoughall unit assignments are believed to be correct, exact relativestratigraphic positioning of samples within stratigraphic unitsbetween USW G-1 and UE-25a#1 may not always be correct. In par-ticular, samples UE-25a#1 2389 and UE-25a#1 2429 have felsic pe-nocryst proportions, lithic fragment contents, and matrix tex-tures which make their exact placement relative to samples fromUSW G-1 questionable.

4.1 USW G-1 407.1

Stratigraphic Unit: Tpt.

Analytical Methods: Thin-section examination (brief), electronmicroprobe analysis (feldspar phenocrysts and matrix).

Description: The sample is a densely welded, devitrified, crys-tal-rich (relative to Tpt samples deeper in USW G-1), lithophysalash-flow tuff. Plagioclase appears to exceed alkali feldspar(sanidine) in abundance. The matrix is a mixture of very-finecrystalline dark brown (to almost opaque) shard relics, andcoarser crystalline lensoid zones of mosaic vapor-phase alteredquartz and feldspar. High gas pressures during the welding anddevitrification process are indicated by the combination ofdensely welded shard and matrix textures coexisting with abundantpores that are partly to completely filled with vapor-depositedtridymite. Fiamme (welded pumice) are typically spheruliticallycrystallized and contain abundant very finely crystalline (10 to30 m) opaque Fe-Ti oxides. One edge of the thin section is partof the vapor-phase altered shell of a lithophysal-cavity.Feldspar phenocrysts in this sample include sanidine (An3.3 Ab49.4Or47.2) and oligoclase plagioclase (An2l Ab69.7 Org.2). The matrix is

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considerably less silicic (SiO2 66.8 wt%) than in rhyolites fromdeeper in the section; this sample is from the caprock of quartzlatitic composition described by Lipman et al. (1966). Someother analytical data obtained from this sample (analyses of al-lanite and chevkinite/ perrierite) for another study have beenreported previously (Price et al., 1985).

4.2 USW G-1 448.9


Analytical Methods: Thin-section examination (brief), electronmicroprobe analysis (feldspar phenocrysts and matrix). Two thinsections were made of this sample, designated "A" and "B"; allmicroprobe analyses were done on the "A" sample.

Description: The sample is a densely welded, devitrified, litho-physal ash-flow tuff. Total phenocryst content is notably lessthan in USW G-1 407.1, and sanidine appears to exceed plagioclasein modal (volumetric) abundance. In one section containing mostof two small lithophysae, tabular crystals, probably tridymite(possibly with some alkali feldspar), are present. The tridymiteis probably vapor-deposited (Price et al., 1985). Matrix con-sists primarily of devitrified shards (showing relict textures)with lensoid zones of more coarsely crystallized matrix, butincludes pumice fiamme which are generally coarsely crystalline,and vapor-phase altered matrix adjacent to lithophysal cavities.Some dirty-brown areas showing locally high birefringence in thevicinity of lithophysae are probably clay-rich zones. Feldsparphenocrysts in this sample include sanidine (An3.1 Ab58.7 Or38.2) andoligoclase plagioclase (Anl4.2 Ab78.4 r7.4). Devitrified shardmatrix and vapor-phase altered matrix are chemically similar,with the main differences due to high porosity (resulting in lowanalytical totals) and higher potassium (K20) in the latter rela-tive to Na2O and CaO. Fiamme, presumed to represent devitrifiedpumice fragments, are slightly less silicic, but are otherwisechemically very similar to devitrified shard matrix. Matrix com-position is that of a high-silica rhyolite (SiO2 77.8 wt%). Someof these data have been reported previously in a slightly differ-ent format (Price et al., 1985).

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I

4.3 USW G-1 504.6



Description: The sample is a welded, devitrified ash-flow tuff.Lithophysal cavities are not evident, although coarse crystal-lization typical of the rims of lithophysal cavities is noted inwhat may be pumice fiamme or severely flattened lithophysae; asecondary mineral showing green color (epidote?) is associatedwith this crystallization. Shard relicts show textures indica-tive of dense welding, but are typically more coarsely crys-talline (axiolitic) than shallower samples, and spherulites whichcross relict fragment boundaries are present. Feldspar phe-nocrysts in this sample include sanidine (An3.8 Ab 4 9.9 r46.3) andoligoclase plagioclase (AnI8.1 Ab74.1 Or7.8). Devitrified shardmatrix and fiamme tend to be less silicic than those from USW G-1448.1, but more silicic than those from USW G-1 407.1. Some ofthese data have been reported previously in a slightly differentformat (Price et al., 1985).

4.4 USW G-1 631.6



Description: The sample is an extensively devitrified welded ash-flow tuff, which is notably phenocryst-poor. Devitrification ofmatrix is so extensive that faint relict shard forms are visibleonly in plane polarized light. Large (>lmm diameter) spherulitesare locally common, with abundant coarsely crystalline mosaics ofcristobalite (±tridymite) and feldspar. Feldspar phenocrysts inthis sample include sanidine (AnI.5 Ab42.5 Or56o) and oligoclaseplagioclase (An16.6 Ab 76.4 Or7.0). Devitrified matrix is, on aver-age, very silicic (SiO2 77.4 wt%) even though the analyses showlow totals due to microscopic-scale porosity; this is a high-silica rhyolite composition.

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4.5 USW G-1 811.1



Description: The sample is an extensively devitrified welded ash-flow tuff, which is notably phenocryst-poor. The thin section isdominated by reddish-brown devitrified matrix in which only faintrelict shard outlines are preserved. Lensoid zones of coarserdevitrified areas show local vapor-deposited tridymite, and aresimilar to vapor-phase-altered areas around lithophysae.Feldspar phenocrysts in this sample include sanidine (An2.1 Ab46.0Or5j.9) and oligoclase plagioclase (AnI5.9 Ab77.2 r6.9). Devitrifiedmatrix is, on average, very silicic (SiO2 73.6 wt%); if analysesare normalized to 100%, this is close to high-silica rhyolitecomposition. The vapor-phase-altered matrix is notably lesssilicic (SiO2 66.0 wt%), and contains a much higher proportion ofK20 than the devitrified shard matrix.

4.6 USW G-1 939.0



Description: The sample is a densely welded, devitrified ash-flowtuff. Much of matrix is brown (in thin section), elongate shardrelics with remainder consisting of small lensoid zones (up to0.5 mm long) of vapor-phase-altered matrix (now mosaic-texturedquartz and feldspar) with local central pores partly filled withtridymite. Large, elongate, spherulite-rich zones (up to severalmm long) are probably pumice fiamme. Feldspar phenocrysts inthis sample include sanidine (AnI.3 Ab3 8.0 Or60.8) and oligoclaseplagioclase (AnI6.7 Ab 76.g Or6.5); plagioclase is dominant in thesection analyzed. Devitrified shard matrix indicates a high-silica rhyolite composition (SiO2 75.7 wt%). The vapor-phase-altered matrix is notably less silicic (SiO2 67.6 wt%), but con-tains very similar proportions of CaO, Na2O and K20.

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4.7 USW G-1 1079.4



Description: The sample is a densely welded, devitrified ash-flowtuff containing very few phenocrysts. Much of matrix is brown(in thin section) elongate shard relics. Zones showing vapor-phase alteration textures are less abundant than in shallowersamples, and most (but not all) of the pore-filling tridymite hasinverted to quartz. Fiamme are dominated by relatively coarsemosaic crystallization textures. This sample contains a veryhigh density of microfractures in thin section, with an estimateddensity of about 1/2 to 1 fracture per millimeter; thesemicrofractures are most commonly filled with quartz, and locallywith some birefringent clays. Feldspar phenocrysts in this sam-ple include sanidine (An1.9 Ab43.0 Or55.1) and oligoclase plagioclase(An16.5 Ab76.4 r7.1). Devitrified matrix is near the low end forhigh-silica rhyolite (SiO2 74.1 wt%) in analyses with low analyt-ical totals (average 94 wt%).

4.8 USW G-l 1208.7



Description: The sample is a densely welded, devitrified ash-flowtuff. In thin section, matrix is dominated by elongate brownshard relics. Zones showing vapor-phase alteration textures areless abundant than in shallower samples, and all of the pore-filling tridymite has inverted to quartz (commonly retaining thetabular habit of tridymite). Coarse mosaic textures dominatecrystallization in fiamme, although a few (apparently) relictspherulitic textures were noted. Feldspar phenocrysts in thissample include sanidine (An1.5 Ab43.1 Or55.4) and oligoclase plagio-clase (Anl7.1 Ab76.3 r6.3). Devitrified matrix is typical for high-silica rhyolite (SiO2 75.8 wt%). The analyses of some areas ofvapor-phase-altered matrix show the material to be extremely

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silicic (SiO2 84.5 wt%), indicating secondary silicification hasoccurred.

4.9 USW G-1 1245


Analytical Methods: Detailed thin-section examination with pointcount, whole-rock analysis, electron microprobe analysis(feldspar phenocrysts, matrix, Fe-Ti oxides), qualitative XRD.

Description: The sample is a devitrified, partially welded ash-flow tuff. Textural indicators of welding have been obscured bysubsequent crystallization, but rare shard relics are relativelyundeformed except near rigid phenocrysts or lithic fragments.Shard relics are brown and semi-isotropic in thin section, butthe low total H20 content (a little more than 1 wt%) in whole-rock analyses, analytical totals in microprobe analyses of matrixmaterials near 100 wt%, and no indication of any amorphous mate-rial in the XRD pattern suggest that glass, if present, is not asignificant constituent in the sample. Although not obvious in.thin section, XRD analysis reveals the presence of a minor amountof clay (presumably in the devitrified shards), and the presenceof cristobalite in addition to quartz as a devitrification prod-uct. Total felsic phenocryst modal content(quartz+plagioclase+alkali feldspar) is 2, and the sample modeincludes about 14% devitrified volcanic lithic fragments. Thewhole-rock analysis is that of a typical high-silica rhyolite(SiO2 76.2 wt%). Microprobe analyses of sanidine phenocrystsshow a fairly wide range in composition (An1 Ab36 r63, to An1 Ab45Or54). Plagioclase is typically oligoclase (AnI7 Ab76 r7), butranges to labradorite (An4o Abs8 Or2). The more calcic plagioclaseis optically distinct and zoned. Analyses of cryptocrystallinematrix and devitrified shards are very similar to the whole-rockanalyses, and coarsely crystalline feldspar analyzed in devitri-fied matrix is virtually identical to sanidine phenocrysts (AnoAb37 r63).

4.10 USW G-1 1315.2


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Description: The sample is a welded, crystal-poor vitric tuff.The matrix texture is typical of welded vitrophyres illustratedby Ross and Smith (1961, p. 25). The glass is isotropic and freeof any notable crystallization but does contain numerous perliticcracks. No feldspar phenocrysts were located in thin section.Microprobe analysis of the glass indicates a high-silica rhyolitecomposition (SiO2 74.1 wt%; higher when normalized to 100%), andrelative and absolute amounts of CaO, Na2O and K20 are indistin-guishable from other analyses of devitrified matrix from otherTpt samples.

4.11 USW G-1 1374.0


Analytical Methods: Thin-section examination (brief).

Description: The sample is a nonwelded, shard-rich vitric tuff.The thin section contains very sparse lithic fragments and phe-nocrysts, including a few small feldspar, biotite and Fe-Ti oxidefragments. Glass is isotropic, pale brown in plane-polarizedlight, and contains tiny needle-like (up to 40 gm long) birefrin-gent crystallites which are probably clays.

4.12 USW G-1 1442.0

Stratigraphic Unit: Tht.

Analytical Methods: Detailed thin-section examination with pointcount.

Description: The sample is a nonwelded, zeolitized ash-flow(?)tuff. origin by ash flow is suggested by poor sorting in whichvery fine matrix and larger pumice fragments are mixed, but muchof the fine matrix may have been produced by zeolitization ofpumice. Zeolites tend to be finely crystalline (<15pm) even inpores and perlitic fragments, and centers of leached pores con-tain poorly reflective opaque material, possibly Mn-oxides.Zeolitization appears to have destroyed most primary shard forms.Total felsic phenocryst modal content (quartz+plagioclase+alkali

-18-

feldspar) is less than 3%, and devitrified lithic fragments com-prise 7% of the mode.

4.13 USW G-1 1487.4



Description: The sample is a nonwelded, zeolitized ash-flow tuff.Origin by ash flow is suggested by poor sorting, mixing very finematrix with larger pumice fragments. The matrix is highlyaltered by zeolitization, but notable relict shard forms are pre-sent. Birefringent crystallites (probably clays) occur in pumicefragments. Total felsic phenocryst modal content (quartz+ pla-gioclase+alkali feldspar) is under 3%, and devitrified lithicfragments comprise about 5% of the mode.

4.14 USW G-1 1519.9



Description: The sample is a nonwelded, zeolitized ash-flow(?)tuff. Origin by ash flow is suggested by poor sorting (mixedvery fine matrix and larger pumice fragments), but extensivealteration of primary textures has occurred, and much fine matrixmay have originated by alteration of pumice. Clay minerals arepresent, coating fragment surfaces and fractures, and appear tohave formed following alteration of glass to perlite and mostzeolitization. Zeolites are present throughout the matrix and inpores. Total felsic phenocryst modal content (quartz+plagioclase+alkali feldspar) is about 4%, and devitrified lithicfragments comprise about 10% of the mode.

4.15 USW G-1 1550.4



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- - - l -~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Description: The sample is a nonwelded, zeolitized ash-flow(?)

tuff. Origin by ash flow is suggested by poor sorting, mixing

very fine matrix with larger pumice fragments, but clast-matrix

boundaries are commonly very obscure due to zeolitization. Zeo-

lite is abundant. Clay and zeolite are developed in pores and

locally in fractures; clays appear to have crystallized last.

Total felsic phenocryst modal content (quartz+plagioclase+alkalifeldspar) is about 2%, and lithic fragments are rare (about 1% of

the mode).

4.16 USW G-1 1594.8


Analytical Methods: Detailed thin-section examination with point

count, electron microprobe analyses (feldspars).

Description: The sample is a nonwelded, zeolitized tuff. Origin

by ash flow is suggested by the poor sorting of matrix fragments,

but primary textures are largely destroyed by zeolitization, and

much of the fine matrix may have originated by alteration of

pumice. Zeolite appears to dominate the sample and occurs as

relatively coarse pore filling, and as finely crystalline

replacement of pumice and matrix. Total felsic phenocryst modal

content (quartz+plagioclase+alkali feldspar) is 5%, and lithic

fragments are relatively rare (about 2%). Feldspars analyzed by

electron microprobe include oligoclase plagioclase (average An24

Ab69 Or7) and sanidine (average Anj Ab33 Or66).

4.17 UE-25a#1 1569


Analytical Methods: Detailed thin-section examination with point

count, whole-rock analysis, electron microprobe analysis

(feldspar phenocrysts, matrix, Fe-Ti oxides), qualitative XRD.

Description: The sample is a nonwelded zeolitized silicic tuff.

Matrix appears isotropic in thin section and is probably par-

tially glassy, but birefringent crystallites (probably clays) are

evident at high magnification. Abundant tabular crystals of

clinoptilolite are present (confirmed by XRD analysis) both

replacing matrix and in pores. No shard relics are noted, and

-20-

are assumed to have been destroyed by zeolitization. Althoughpumice appears to be thoroughly zeolitized, two varieties ofpumice textures are preserved. Total felsic phenocryst modalcontent (quartz+plagioclase+alkali feldspar) is about 2%, anddevitrified lithic fragments are abundant (but less than the 27%shown in Appendix A since this amount includes some glassy andzeolitized lithics). The whole rock analysis shows an elevatedtotal H20 content of about 7.6 wt%; this is less than that char-acteristic of more extensively zeolitized tuffs which typicallyhave total H20 between 10 and 13 wt% (Connolly et al., 1984), butthis easily could be the result of the high percentage of devit-rified lithic fragments in this sample. Relative to typical rhy-olites, this sample is enriched in CaO and depleted in Na2O,probably as a consequence of zeolitization (see Connolly et al.,1984). Microprobe analyses of matrix materials indicate that anyglass which may be.present is hydrated and probably extensivelyzeolitized.

4.18 USW G-1 1617.0


Analytical Methods: Detailed thin-section examination with pointcount, electron microprobe analyses (feldspars).

Description: The sample is a nonwelded, zeolitized ash-flow tuff.Origin by ash flow is suggested by poor sorting, mixing very finematrix with larger pumice fragments. Zeolite (clinoptilolite)occurs as larger tabular crystals (5pm to 20gm) in pores andreplacing pumice and perlite, and as very finely crystalline(<lpm) material replacing matrix. Birefringent crystallites(probably clays) occur in. minor amounts in pumice fragments.Total felsic phenocryst modal content (quartz+ plagioclase+alkalifeldspar) is less than 4%, and devitrified lithic fragments com-prise about 5% of the mode. Feldspars analyzed by electronmicroprobe include oligoclase plagioclase (Anlg Ab71 OrIO) andsanidine (Ani Ab32 r67).

4.19 USW G-1 1665.5


-21-


Description: The sample is a nonwelded, zeolitized ash-flow tuff.Ash-flow origin is suggested by poor sorting, mixing fine matrixand coarser pumice fragments, but relict shards are not recogniz-able in the zeolitized matrix. Coarse (20pm to 50pm) clinoptilo-lite crystals partly fill leached pores in altered perlite frag-ments. Birefringent clay minerals are rare and largely confinedto pumice fragments. Total felsic phenocryst modal content(quartz+plagioclase+alkali feldspar) is 5, and devitrified vol-canic lithic fragments are about 4% of the mode.

4.20 USW G-1 1668.5



Description: The sample is a nonwelded, zeolitized ash-flow tuff.Ash-flow origin is suggested by poor sorting, mixing fine matrixand coarser pumice fragments. Shard outlines are commonlyaltered by zeolitization, but some are recognizable in thematrix. Opal (recognized as low-relief, semi-isotropic material)occurs as pore filling in pumice and matrix and as a lining inmicroscopic cracks and fractures; textural relations in poressuggest that opal largely postdates clinoptilolite. Total felsicphenocryst modal content (quartz+plagioclase+alkali feldspar) isabout 3%, and devitrified volcanic lithic fragments are about 6.of the mode.

4.21 USW G-1 1719.7



Description: The sample is a nonwelded, zeolitized ash-flow tuff.Ash-flow origin is suggested by poor sorting, mixing fine matrixand coarser pumice fragments. Shard outlines are commonlyaltered by zeolitization, but some are recognizable in thematrix. Felsic phenocrysts show local development of shock-

-22-

related effects: extreme fracturing of quartz and plagioclase andrare kink bands in sanidine. Total felsic phenocryst modal con-tent (quartz+plagioclase+alkali feldspar) is 6, and modal con-tent of devitrified volcanic lithic fragments is about 9%.

4.22 USW G-I 1741.8



Description: The sample is a nonwelded, zeolitized ash-flow tuff.Ash-flow origin is suggested by poor sorting, mixing fine matrixand coarser pumice fragments, but relict shards are not recogniz-able in the zeolitized matrix. Coarse (up to 6pm) clinoptilo-lite crystals partly fill pores in altered perlite fragments andpumice. Development of clay minerals rimming most non-phenocrystclasts and within pumice is extensive, and may be indicative ofsome weathering of the zeolitized tuff. Total felsic phenocrystmodal content (quartz+plagioclase+alkali feldspar) is 7%, anddevitrified volcanic lithic fragments are rare (about 1% of themode).

4.23 USW G-1 1784.8



Description: This sample is a tuffaceous (or volcaniclastic)sandstone. Matrix contains a high percentage of very fine mate-rial, but this is primarily the result of alteration of unstable(i.e., glassy) lithic fragments. Total felsic phenocryst modalcontent (quartz+plagioclase+alkali feldspar) is 22%. Recogniz-able volcanic lithic fragments are generally well-sorted, andinclude both zeolitic and devitrified tuff; together they com-prise 26% of the mode. Clay minerals occur as a rim around vir-tually all clasts in a similar (but more extensive) manner tothat observed in USW G-1 1741.8, and most fragments are roundedto some extent, indicating probable reworking.

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4.24 UE-25a#1 2000

Stratigraphic Unit: Tcp.

Analytical Methods: Detailed thin-section examination with pointcount, whole-rock analysis, electron microprobe analysis(feldspar phenocrysts, matrix), qualitative XRD.

Description: The sample is a densely to moderately welded, devit-rified ash-flow tuff. Shard relics are texturally distinct andshow axiolitic crystallization. Total felsic phenocryst modalcontent (quartz+plagioclase+alkali feldspar) is about 12%, anddevitrified lithic fragments comprise about 3% of the mode. Thesample contains almost 9% disseminated Fe oxides which isreflected in an elevated amount of Fe2O3 (1.75 wt%) in the whole-rock analysis. The whole-rock analysis is that of a high-silicarhyolite (75.9 wt% Sioz), with low H20 content (about 1 wt%) typ-ical of devitrified samples. Low relative A1203 is reflected inlow corundum in the CPW Norm (0.15), and high ferric iron isreflected in high hematite (1.55). Sanidine analyses are veryhomogeneous with an average composition of Anl.4 Ab4s.s r53.1. Pla-gioclase is predominantly a potassic variety of oligoclase(about AnIt Ab7g OrIa); subordinate, less potassic oligoclase toandesine ranges between An28.5 Ab 68.1 Or3.4 and An42.9 Ab55.1 Or2.0.Devitrified shards are much more silicic (83 to 87 wt% Sio2) thanthe whole-rock, and analyses of axiolitically crystallized frag-mental material (identified as altered pumice and counted as 19%of the mode) appear to be dominated by a potassic feldspar withlow analytical totals due to micro-scale porosity.

4.25 USW G-1 2067



Description: The sample is a partially welded zeolitized ash-flowtuff. Matrix is semi-isotropic and may be partly glassy, butappears microcrystalline at high magnification with the develop-ment of SlOj1Lm zeolite locally replacing shards in matrix and par-tially filling pores in pumice. Partial welding is recognizedfrom weak preferred orientation of shards and pumice fragments.

-24-

Although altered extensively by zeolitization, relict shards arerecognizable. Some clay minerals (as birefringent microliticaggregates) are present locally, replacing pumice and matrix.Total felsic phenocryst modal content (quartz+ plagioclase+alkalifeldspar) is 8%, and devitrified lithic fragments comprise about5% of the mode.

4.26 USW G-1 2170



Description: The sample is a nonwelded zeolitized tuff, which mayhave been somewhat reworked. All components are randomly ori-ented, with no indication of welding. Matrix appears largelyamorphous, but is clearly zeolitized when viewed in thin sectionunder high magnification. All fragments except phenocrysts anddevitrified volcanic lithics are altered and boundaries betweenmatrix and other components can be indistinct. Unlike some othersamples, however, relict shard and pumice structures are locallyfairly well preserved. Ash-flow (versus air-fall) origin is sug-gested by the presence of abundant fine matrix, but a tendencyfor pumice, perlite and lithic fragments to be somewhat roundedand the presence of hematitic alteration rims 20 to 40pm thickaround fragments suggest some reworking. Geopetal structure, inwhich pores are partially filled with zeolite first and then withopal, is well developed and suggests that deposition of thesephases occurred while the rock was in a partially saturated con-dition. The paragenetic alteration sequence indicated is 1.development of oxide rims, 2. zeolitization and 3. deposition ofopal. Total felsic phenocryst modal content (quartz+plagioclase+alkali feldspar) is 11% and all phases are commonly fractured.Devitrified volcanic lithics are 5% of the mode.

4.27 USW G-I 2274

Stratigraphic Unit: Tcb.


-25-

I~~~~~~~~~~~~~~~~

Description: The sample is a partially welded zeolitized (andoxidized) ash-flow tuff. Alteration includes replacement ofmatrix by a mixture of tabular zeolite and brown, semi-opaquenon-reflective (probably Fe2O3-rich) material overprinting pri-mary textures. Zeolite is common and partly fills pores inpumice. Oxidation is evident throughout, including extensivemarginal alteration of Fe-Ti oxide phenocrysts. Total felsicphenocryst modal content (quartz+plagioclase+alkali feldspar) is11%, and devitrified lithic fragments are notably absent.

4.28 USW G-1 2276



Description: The sample is a nonwelded to partially welded zeoli-tized ash-flow tuff. This sample is very similar to USW G-12274; notable differences include higher proportions of felsicphenocrysts (modal content of quartz+plagioclase+alkali feldsparis about 17%), more biotite, more extensive filling of pores byzeolite, and late filling of some pores by opal.

4.29 USW G-1 2284



Description: The sample is a partially welded zeolitized ash-flowtuff. In thin section, shards and pumice fragments show notablepreferred orientation but minimal deformation, with intact bubblewalls common. Fine matrix is isotropic and brown in color sug-gesting that it is at least partly glassy, but zeolite is abun-dant in pores in pumice (up to 50pm tabular clinoptilolite crys-tals with minor mordenite needles), and may be present as a veryfinely crystalline replacement of some of glassy matrix. Highporosity (7%) is due to extensive leaching of glassy fragments.Total felsic phenocryst modal content (quartz+ plagioclase+alkalifeldspar) is 16%, and devitrified lithic fragments are rare orabsent.

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4.30 UE-25a#1 2389


Analytical Methods: Detailed thin-section examination with pointcount, electron microprobe analysis (feldspar phenocrysts,matrix, Fe-Ti oxides).

Description: The sample is a moderately(?) welded, devitrifiedash-flow tuff. Matrix is completely devitrified, and devitrifi-cation textures commonly obliterate original fragmental textures.Total felsic phenocryst modal content (quartz+ plagioclase+alkalifeldspar) is 20%, and all show some resorption textures. Devit-rified lithic fragments comprise 2% of the mode. Sanidine phe-nocryst compositions average An1 Ab39 r60. Plagioclase variesbetween oligoclase (An15 Ab78 Or7) and andesine (An32 Ab65 r3).Microprobe analyses of both coarsely and finely devitrifiedmatrix appear to indicate mixture of alkali feldspars and silica,with some local micro-scale porosity producing low analyticaltotals.

4.31 UE-25a#I 2429



Description: The sample is a partially to moderately(?) weldeddevitrified ash-flow tuff. Matrix is completely devitrified, anddevitrification textures obliterate original fragmental textures.Total felsic phenocryst modal content (quartz+plagioclase+alkalifeldspar) is 15%, and devitrified lithic fragments comprise 1% ofthe mode. The whole-rock analysis indicates high-silica rhyolitecomposition (SiO2 75.2 wt%) and low H20 content (about 1 wt%)typical of devitrified tuff. Sanidine phenocryst compositionsaverage Ani Ab39 Or6o. Plagioclase phenocrysts are oligoclase(An 17 Ab78 r6), and although compositional zoning is indicatedoptically, this could not be verified by microprobe analyses.Microprobe analyses of both coarsely and finely devitrifiedmatrix suggest a mixture of alkali feldspars and silica. Somemicrocrystalline areas show low analytical totals, probably due

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- l~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

primarily to micro-scale porosity, but possibly due, in part, tothe presence of minor clay minerals identified by XRD.

4.32 USW G-1 2312



Description: The sample is a moderately welded zeolitized andglassy ash-flow tuff. Welding is indicated by shard deformationtextures in matrix and strong flattening of pumice clasts.Matrix is semi-isotropic but largely zeolitized (clinoptilolitewith minor mordenite in pores) showing the development of somebrownish cryptocrystalline opal replacing glassy fragments. Thestyle of crystallization of matrix is very similar to USW G-12274 and USW G-l 2276, although the combination of moderate weld-ing with zeolitization is unusual. Total felsic phenocryst modalcontent (quartz+plagioclase+alkali feldspar) is 11%, and devitri-fied lithic fragments are absent.

4.33 USW G-1 2338



Description: The sample is a moderately welded, devitrified ash-flow tuff. Welding is indicated by distortion of shards aroundphenocrysts, and flattening of pumice fragments. Extensivedevitrification includes axiolitic crystallization of shards,coarse mosaic-type matrix crystallization, spherulites in pumice,finely microcrystalline matrix, and quartz and feldspar crystal-lized in pores. Total felsic phenocryst modal content(quartz+plagioclase+alkali feldspar) is 16%, and devitrifiedlithic fragments are absent.

4.34 UE-25a#l 2499


-28-


Description: The sample is a partially to moderately(?) weldeddevitrified ash-flow tuff. Matrix is completely devitrified, andprimary matrix textures are difficult to recognize in thin sec-tion. Probable moderate welding is recognized by large-scalefabric in hand specimen and preferred orientation of fragments inthin section. Total felsic phenocryst modal content (quartz+Plagioclase+Alkali Feldspar) is 22%, and devitrified lithic frag-ments are absent. Sanidine phenocryst compositions clustertightly around Ani Ab38.5 r60.5; plagioclase tends to be somewhatmore variable in composition (An13 Ab79 Or5, to AnI8 Ab76 r6).Microprobe analyses of matrix are all very silicic. The analysescould indicate secondary silicification or magmatic fractionationof SiO2 into the matrix (with Al, Ca, K, and Na going intofeldspar phenocrysts). Fe-Ti oxides analyzed by microprobe areunusual in that they contain high amounts of MnO in both titanif-erous magnetite (3 to 4 wt%) and ilmenite (2 wt%).

4.35 USW G-1 2367



Description: The sample is a moderately(?) welded, devitrifiedash-flow tuff. Degree of welding suggested by strong preferredorientation of elongate spherulitic and axiolitic crystallizedareas in matrix (inferred to be areas of relict pumice andshards); primary depositional textures have been destroyed bythorough devitrification of matrix. Devitrification texturesinclude fine microcrystalline'and coarse spherulitic crystalliza-tion locally overprinted by coarser mosaic-style development ofalkali feldspar and quartz. Total felsic phenocryst modal con-tent (quartz+plagioclase+alkali feldspar) is 15%, and devitrifiedlithic fragments are extremely rare.

4.36 USW G-1 2380


-29-


Description: The sample is a moderately(?) welded, devitrifiedash-flow tuff. Textures in this sample are virtually identicalto those in USW G-1 2367. Fine matrix is microscopically crys-talline with crystals under 5m, and coarse spherulitic matrix(alkali feldspar plus a silica phase) occurs in distinctly elon-gate areas, and locally appears to be pseudomorphic after shards.Coarse (0.03 to 0.2 mm crystals) mosaic-textured matrix occursreplacing fine matrix. Total felsic phenocryst modal content(quartz+plagioclase+alIkali feldspar) is 14%, and devitrifiedlithic fragments are rare.

4.37 USW G-1 2406



Description: The sample is a welded, devitrified ash-flow tuff.In this sample, the degree of welding cannot be estimated bythin-section textures because of virtually complete destructionof primary depositional textures by devitrification, but positionbetween demonstrably welded units suggests at least moderatewelding. As with USW G-1 2367 and USW G-1 2380, early finemicrocrystalline and spherulitic devitrification textures havebeen partly replaced by coarse mosaic-style zones of alkalifeldspar and quartz. This sample contains a high percentage ofcoarse matrix (37%); abundant coarse matrix is characteristicsamples down to USW G-1 2493, and presumably represents the mostslowly-cooled part of the interior of this cooling unit. Totalfelsic phenocryst modal content (quartz+ plagioclase+alkalifeldspar) is 16%, and quartz commonly contains visible multi-phase fluid inclusions. Devitrified lithic fragments are absent.

4.38 USW G-1 2415



-30-

Description: The sample is a welded, devitrified ash-flow tuff.The rock is virtually identical to USW G-1 2406, and the samecomments regarding welding and devitrification apply; in thissample, the modal percentage of coarse crystalline matrix isslightly less at 33%. Total felsic phenocryst modal content(quartz+plagioclase+alkali feldspar) is 14%, and devitrifiedlithic fragments are very rare.

4.39 USW G-1 2428



Description: The sample is a moderately(?) welded devitrifiedash-flow tuff. Degree of welding is suggested by elongation ofspherulitic matrix (presumed to be devitrified pumice); primarydepositional textures have been destroyed by thorough devitrifi-cation of matrix. Devitrification includes a fine microcrys-talline texture (in fine matrix) grading into finely crystallinespherulitic and axiolitic structures; the latter commonly occurin elongate shapes suggesting replacement of shards. Elongatedark reddish-brown zones rich in poorly reflective Fe203-richopaque minerals are present. As in other samples in this inter-val, coarse mosaic-textured quartz-feldspar matrix (32% of mode)appears to replace other types of matrix. Total felsic phe-nocryst modal content (quartz+plagioclase+alkali feldspar) is19%; alkali feldspars show the development of optically continu-ous overgrowth rims 10 to 50 m thick. The thin section containsminor (1% of mode) volcanic lithic fragments.

4.40 USW G-1 2493



Description: The sample is a devitrified, welded ash-flow tuff.Indicators of the degree of welding are absent due to destructionof primary depositional textures by extensive crystallization.Devitrification includes fine microcrystalline textures and rela-

-31-

f

tively rare coarse spherulitic crystallization; the former com-monly is gradational with a coarse blocky mosaic of alkalifeldspar and quartz (37% of the mode). Total felsic phenocrystmodal content (quartz+plagioclase+alkali feldspar) is 19%; over-growth rims around alkali feldspars are present, but are thinner(10 to 20 pm) and less abundant than in USW G-1 2428. No lithicfragments were observed in thin section.

4.41 USW G-1 2502



Description: The sample is a moderately welded, devitrified ash-flow tuff. Degree of welding is indicated by some deformationand flow in the shard matrix; this deformation is particularlypronounced around rigid phenocrysts. Although devitrified, thesample contains very clearly defined shard relics. A few shardsare brown and appear isotropic (possibly glassy), but could bevery finely crystalline. Other devitrification textures includeelongate spherulitic zones (pumice fiamme), and a much lowermodal percentage (15%) of mosaic-textured coarse matrix (comparedwith USW G-1 2493). Total felsic phenocryst modal content(quartz+ plagioclase+alkali feldspar) is 11%, and 3 lithic frag-ments are included in the mode. Well-defined shard relics mark adistinct break in the style of devitrification (compared with USWG-1 2493), and the change in phenocryst abundance and appearanceof lithic fragments suggest that this crystallization break maybe an eruptive flow break as well.

4.42 USW G-1 2510



Description: The sample is a moderately welded, devitrified ash-flow tuff. Shard relics and flattened crystallized pumice (nowfiamme) show strong preferred orientation and elongation; flowdeformation of shards is very limited except around phenocrysts.

-32-

Devitrification textures include brown axiolitically crystallizedshard relics, finely crystalline non-shard matrix, and coarsespherulitic crystallization in pumice fiamme. Fiamme commonlydisplay dark oxidized rims. Coarse mosaic crystallization(feldspar ± quartz) occurs overprinting other matrix types, butcommonly respects relict fragment boundaries. Total felsic phe-nocryst modal content (quartz+plagioclase+alkali feldspar) is12%, and the mode includes 1% lithic fragments.

4.43 USW G-1 2538



Description: The sample is a moderately to partially welded,devitrified ash-flow tuff. Shard relics are deformed around phe-nocrysts, but show very little flow deformation and only moderatepreferred orientation in other areas of the matrix. Devitrifica-tion is extensive: crypto- to microcrystalline in fine matrix,axiolitic in relict shards, and more coarsely spherulitic inelongate areas interpreted to be formerly pumice. Coarsely crys-talline mosaic-textured matrix appears to occur only as a partialreplacement of spherulitic matrix. Rare brown isotropic(glassy?) shards are present. Overall, crystallization is skewedtowards finer crystal sizes relative to USW G-I 2502, and appearsless intense. Total felsic phenocryst modal content (quartz+plagioclase+alkali feldspar) is 11%, and the mode includes 2%lithic fragments (mostly devitrified volcanics).

4.44 USW G-1 2550



Description: The sample is a partially to moderately welded,zeolitized ash-flow tuff. Welding is indicated by preferred ori-entation of shards in matrix and deformation of shards aroundphenocrysts. Devitrification textures (spherulites, axiolites orcoarse mosaics present in Tcb samples above this one) are absent,

-33-

I~~~~~~~~~~~~~~~~~~~~~~~~~~

but zeolitization is evident throughout. Although some isotropicshards and matrix areas suggest that some glass probably remains,most shards have been leached and partially replaced by aggre-gates of small (average 3m) tabular zeolites leaving pores inthe central part of the shards. Zeolite development is irregularwithin single thin sections, both in abundance and crystal size;in some areas tabular clinoptilolite crystals as large as 20pmare noted. Total felsic phenocryst modal content(quartz+plagioclase+alkali feldspar) is 14%; plagioclase phe-nocrysts are strongly zoned and show an optically distinct core-rim break. Lithic fragments comprise 6% of the mode and are tex-turally very different from the devitrified tuff lithics presentin rock units above Tcb; they are mostly very fine grained withoccasional phenocrysts that suggest a volcanic origin.

4.45 USW G-1 2563



Description: The sample is a moderately welded, partly(?) zeoli-tized ash-flow tuff. Welding is indicated by extensive sharddeformation around phenocrysts and some flow deformation through-out the shard matrix. Porosity has largely been eliminated frompumice fragments by welding, but is present in and betweenshards, probably as a consequence of zeolitization. Yellowish,almost isotropic glass shards, which have been partly leached andreplaced by tabular zeolites, are common in the matrix. The thinsection contains a prominent micro-scale fault 50 to 100 m wide,filled with dark fine-grained material, and across which phe-nocrysts are terminated and brecciated. Total felsic phenocrystmodal content (quartz+ plagioclase+alkali feldspar) is 14%.Lithic fragments comprise about 2.5% of the sample, and most ofthese show crystallization textures (axiolites, spherulites,etc.) typical for devitrified, welded tuff.

4.46 USW G-1 2585


-34-


Description: The sample is a partially welded, zeolitized ash-flow tuff. Welding is indicated by minor shard deformationaround phenocrysts, and notable flattening of pumice fragments.Zeolitization is extensive throughout fine-grained non-shardmatrix, as pore lining and filling in large pumice and unbrokenbubble walls, and, most prominently, as partial replacement ofleached shard fragments. Interiors of partially filled porescontain a late-stage opal fill. Brown oxidized rims outliningpumice and lithic fragments are common, and occur locally withinpumice fragments. Total felsic phenocryst modal content (quartz+plagioclase+alkali feldspar) is 11%, and lithic fragments com-prise about 1% of the mode.

4.47 USW G-1 2658

Stratigraphic Unit: Tct.


Description: The sample is a nonwelded, zeolitized(?) and partlyglassy(?) ash-flow tuff. There are no textures present whichwould suggest any welding, but original textures have been exten-sively modified by zeolitization and other low-temperature alter-ation. In thin section, the matrix appears almost isotropicunder low magnification, but at high magnification numerous small(•3 m) crystallites are apparent, along with some very poorlydeveloped small (50 m) spherulites. Undeformed altered pumicefragments are present which contain pores partially filled with alow-birefringence material, probably zeolite. Total felsic phe-nocryst modal content (quartz+plagioclase+alkali feldspar) is 9%.Lithic fragments comprise about 2% of the mode, and include somedevitrified welded tuff fragments.

4.48 USW G-1 2928.6


-35-

I


Description: The sample is a moderately welded, devitrified ash-flow tuff. Moderate welding is inferred from preferred orienta-tion of elongate crystallized pumice fiamme, but devitrificationhas obscured most primary textures. Total felsic phenocrystmodal content (quartz+plagioclase+alkali feldspar) is 15%, anddevitrified lithic fragments comprise about 5% of the mode.Overall, the sample is very similar to USW G-1 2939.3. Sanidinecompositions cluster tightly around Ani Ab33 Or66. Plagioclaseranges in composition from Anj9 Ab75 Or6 to An4o Abs7 r3, and cal-cite is noted locally replacing cores of more calcic, zoned pla-gioclases. Microprobe analyses of matrix show a range of compo-sitions indicative of extensive devitrification to quartz andfeldspar.

4.49 USW G-1 2939.3



Description: The sample is a moderately to partially(?) welded,devitrified ash-flow tuff. Welding texture is ambiguous due tothe preservation of delicate "Y" and "V' shard shapes in relicsin the matrix which also contains elongate fiamme. Total felsicphenocryst modal content (quartz+plagioclase+alkali feldspar) is15%, and Fe-Ti oxides (3%) and Biotite (1%) are also notable.Devitrified lithic fragments comprise about 5% of the mode. Thewhole-rock analysis indicates high-silica rhyolite composition(Sio2 76.6 wt%), and low H20 content (about 1 wt%) typical ofdevitrified tuff. Sanidine composition is typically Anj Ab33 Or66,but varies some in Ab-Or content. Plagioclase shows a range incomposition which is roughly bimodal: oligoclase (An1I7 Ab76 Or7)and andesine (An47 Ab51 r2). The more calcic plagioclase is opti-cally and chemical zoned, and plagioclase cores are locallyaltered to calcite. Microprobe analyses show the matrix to bemore silicic than the whole rock, reflecting enrichment of SiO2

in the residuum as feldspar crystallized in the magma. Some

-36-

areas of matrix analyzed show clay-like chemistry, supporting the

presence of minor amounts of clays identified by XRD. Fe-Ti

oxide analyses show notable amounts of MnO in the analyses.

-37-

I

5.0 REFERENCES

Bence A.E., and A.L. Albee, 1968, "Empirical Correction Factors

for the Electron Microanalysis of Silicates and Oxides,"

Journal of Geology, v. 76, pp. 382-403. (NNA.890918.0509)

Carroll, D., 1970, "Clay Minerals: A Guide to Their X-Ray Identi-

fication," Geological Society of America Special Paper

126, 126 p. (NNA.910405.0058)

Chambers W.F., 1985, SANDIA TASK8: A Subroutined Electron Micro-

probe Automation System, SAND85-2037, Sandia National

Laboratories, Albuquerque, New Mexico, 115 p.

(NNA.890327.0032)

Chambers, W.F., and J.H. Doyle, 1990, SANDIA TASK8, Version C: A

Subroutined Electron Microprobe Automation System,

SAND90-1703, Sandia National Laboratories, Albuquerque,

New Mexico, 163 p. (NNA.91620.0125)

Connolly, J.R., K. Keil, W.L. Mansker, C.C. Allen, J. Husler, R.

Lowy, D.R. Fortney, and A.R. Lappin, 1984, Petrology and

Geochemistry of Samples from Bed-Contact Zones in Tunnel

Bed 5, U12g-Tunnel. Nevada Test Site, SAND84-1060, Sandia

National Laboratories, Albuquerque, New Mexico, 44 p.

(NNA.900810.0672)

Goldstein, J.I, D.E. Newbury, P. Echlin, D.C. Joy, C. Fiori, and

E. Lifshin, 1981, Scanning Electron Microscopy and X-Ray

Microanalysis, New York, Plenum Press, 673 p.

(NNA.910405.0051)

Lipman, P.W., R.L. Christiansen, and J.T. O'Connor, 1966, A Com-positionally Zoned Ash-Flow Sheet in Southern Nevada,

U.S. Geological Survey Professional Paper 524-F, 47 p.

(HQS.880517.1319)

Lof, P., 1982, Elsevier's Mineral and Rock Table, Amsterdam, The

Netherlands, Elsevier Science Publishers.

(NNA.890713.0150)

Price, R.H., F.B. Nimick, J.R. Connolly, K. Keil, B.M. Schwartz

and S.J. Spence, 1985, Preliminary Characterization of

the Petrologic. Bulk, and Mechanical Properties of a

-38-

Lithophysal Zone Within the Topopah Spring Member of the

Paintbrush Tuff, SAND84-0860, Sandia National Laborato-

ries, Albuquerque, New Mexico, 115 p. (NNA.870406.0156)

Ross, C.S. and R.L. Smith, 1961, Ash-Flow Tuffs: Their Origin

Geologic Relations and Identification, U.S. Geological

Survey Professional Paper 366, 81 p. (NNA.910405.0048)

Sheppard R.A., and A.J. Gude III, 1969, Diagenesis of Tuffs in

the Barstow Formation. Mudd Hills. San Bernadino County

California, U.S. Geological Survey Professional Paper

634, 35 p. (NNA.910522.0036)

Spengler, R.W., D.C. Muller, and R.B. Livermore, 1979, Prelimi-

nary Report on the Geology and GeophVsics of Drill Hole

UE25a-1 Yucca Mountain. Nevada Test Site, U.S. Geologi-

cal Survey Open-File Report 79-1244, 43 p.

(HQS.880517.1491)

Spengler, R.W., F.M. Byers, Jr., and J.B. Warner, 1981, Stratig-

raphy and Structure of Volcanic Rocks in Drill Hole USW

G1 Yucca Mountain. Ne County. Nevada, U.S. Geological

Survey Open-File Report 81-1349, 50 p. (HQS.880517.1492)

Van der Plas, L., and A.C. Tobi, 1965, "A Chart for Judging the

Reliability of Point Counting Results," Am. Jour. Sci.,

v.263, pp. 87-90. (NNA.890522.0286)

-39-

APPENDIX A

DATA COMPILATION FOR THIN-SECTION ANALYSES

-40-

Petrographic Data Compilation for the Yucca Mountain Project SEPDB(Thin-Section Data)

Part 1. SAMPLE LOCATION AND IDENTIFICATION

Sample ID: G-1245 Sample Origin: Drill Hole USW G-1Location: Depth 1,245 ft Test : 1

Part 2. PARAMETERSThin-Section Description

Thin-Section ID s: Gl-1245

Welding: PartialLithologic Type: Silica-feldsparType of Pore-Filling Material: Quartz

Thin-Section Mode Estimated by: Point Count--#Points: 600

Constituents

Matrix:Shards:Pumice:

Altered Perlite:Devitrified Lithics:Zeolitized Lithics:

Glassy Lithics:Alkali Feldspar:

Plagioclase Feldspar:Quartz:Biotite:

Fe-Ti Oxides:Others (See below):Porosity (Visible):

Total:

Amount (%)

83.00.00.00.0

14. 00.00.01.01.00.00.01.00.00.0

________100_0100. 0

Est Errcr(95% Conf)

+/- 3.1

+/- 2.8

+/- 0.8+/- 0.8

+/- 0.8

Includedin "Others": Trace quartz, biotite.

Note: Error calculation uses method of Van der Plas and Tobi (1965)and estimates counting errors at a 95% confidence level.

Thin-Section Comments:Possible partial welding, but textural indicators not good.Spherulitic, axiolitic, & mosaic (pore filling?) devitrification.Opaques are mostly fine, disseminated in matrix.

Part 3. EXPERIMENT CONDITIONSStandard. See SAND91-7031 for details of procedures followed.

Part 4. REFERENCE AND SUPPORTING INFORMATION

QA LEVEL OF DATA- YMP DRMS DATA SET SNL DATAGATHERING ACTIVITY: TBD ID: 51/L04-4/19/90 REPT : SAND91-7031

DCF COMPILED BY: J.R. Connolly DIV: 6315 (UNM) Date: 9/24/91

-41-



Sample ID: G1-1442.0 Sample Origin: Drill Hole USW G-1Location: Depth 1,442 ft Test #: 1


Thin-Section ID #s: Gl-1442-A, Gl-1442-B

Welding: NonweldedLithologic Type: ZeolitizedType of Pore-Filling Material: Zeolite


Constituents






Amount (%)Est Error(95% Conf)

+/- 3.448.00.0

28.05.07.00.00.01.01.01.00.00.00.09.0

+1 -+1 -+1 -

+1 -+1 -+1 -

3.01.51.7

0.70.70.7

+/- 1.9

Total: 100.0Includedin "Others": Trace biotite, opaque oxides.


Thin-Section Comments:Clays not noted with abundant clinoptilolite. Shard forms veryrare--most destroyed by zeolitization. Some Fe-Mn oxides maybe present in pores.



QA LEVEL OF DATA- YMP DRMS DATA SET SNL DATAGATHERING ACTIVITY: TBD ID: 51/L04-4/19/90 REPT #: SAND91-7031


-42-

4



Sample ID: G1-1487.4 Sample Origin: Drill Hole USW G-1Location: Depth 1,487.4 ft Test 4a: 1


Thin-Section ID s: Gl-1487.4-A, G-1487.4-B

Welding: NonweldedLithologic Type: Zeolitized, clay(?)Type of Pore-Filling Material: Zeolite

Thin-Section Mode Estimated by: Point Count--#Points:1022

Constituents






Amount (%)

52.00.0

33.01.05.00.00.01.00.01.00.00.00.08.0

Est Error(95% Conf)

+/- 3.1

+1 -+1 -+1-

2.90.61.4

+/- 0.6

+/- 0.6

+/- 1.7_____________

Total: 101.0Includedin "Others": Trace plagioclase, biotite, opaque oxides.


Thin-Section Comments:Altered perlite clasts (2 to 20 mm across) noted in handsample. Zeolite commonly fills pores in pumice, and some claynoted. Matrix and pumice division on arbitrary 30 micron size.





-43-



Sample ID: G1-1519.9 Sample Origin: Drill Hole USW G-1Location: Depth 1,519.9 ft Test : 1


Thin-Section ID s: Gl-1519.9-A, Gl-1519.9-B

Welding: NonweldedLithologic Type: Zeolitized, claysType of Pore-Filling Material: Zeolite, clay


Constituents




Plagioclase Feldspar:Quartz:

Biotite:Fe-Ti Oxides:

Others (See below):Porosity (Visible):

Amount (%)

45.028.0

0.07.0

10.00.00.02.01.01.01.00.00.05.0

Est Error(95% Conf)

+/- 3.0+/- 2.7

+/- 1.5+/- 1.8

+1 -+1 -+1 -+1-

0.80.60.60.6

+/- 1.3

Total: 100. 0Includedin "Others": Trace biotite. Clays present in pumice.


Thin-Section Comments:Clays commonly coat zeolites, and are most abundant in smallerpumice fragments, natrix, and lining pores in altered perlite.Perlite paragenesis is: hydration, leaching, zeolite, clay.





-44-





Thin-Section ID #s: Gl-1550.4-A, Gl-1550.4-B

Welding: NonweldedLithologic Type: Zeolitized, claysType of Pore-Filling Material: Zeolite, clay


Constituents






Amount (%)Est Error(95% Conf)

+/- 2.843.00.0

47.02.01.00.00.01.00.01.00.00.00.05.0

+1-+1 -+1 -

2.80.80.6

+/- 0.6

+/- 0.6

+/- 1.2

Total: 100.0Includedin "Others": Trace plagioclase, biotite, oxides.


Thin-Section Comments:Several-clay filled fractures noted. Pumice-matrix division isarbitrary, based on 30 micron size. Perlite paragenesis is:hydration (perlitization), leaching, zeolite, clay.





-45-

- -~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Petrographic Data Compilation for the Yucca Mountain Project SEPD3(Thin-Section Data)




Thin-Section ID #s: Gl-1594.8-A, Gl-1594.8-B



Constituents Amount (%)Est Erro:(95% Conf)

+/- 3.3Matrix: 42.0Shards: 0.0Pumice: 39.0

Altered Perlite: 4.0Devitrified Lithics: 2.0Zeolitized Lithics: 0.0

Glassy Lithics: 0.0Alkali Feldspar: 2.0

Plagioclase Feldspar: 1.0Quart::: 2.0

Biotite: 0.0Fe-Ti Oxides: 0.0

Others (See below): 0.0Porosity (Visible): 8.0

_____________

+1 --'�1 -

+1 -

+1 -

3.31.30.9

0.90.70.9

+/- 1.8



Thin-Section Comments:Matrix-pumice size division 30 microns. Much matrix createdby zeolitization of pumice. Perlite leached and replaced byzeolite. Point count on one section due to plucking in other.




DCF COMPILED BY: J.R. Connally DIV: 6315 (UNM) Date: 9/24/91======================:===-=========--=================================

-46-



Sample ID: A-1569 Sample Origin: Drill Hole UE-25a#lLocation: Depth 1,569 ft Test # 1


Thin-Section ID s: Al-1569



Constituents Amount (%)

Matrix: 59.3Shards: 0.0Pumice: 8.0



Plagioclase Feldspar: 0.1Quartz: 0.8Biotite: 0.1

Fe-Ti Oxides: 0.8Others (See below): 0.0Porosity (Visible): 2.4

Est Error(95% Conf)

+/- 3.9

+/- 2.1

+/- 3.5

+1 -+1 -+1 -+1 -+1 -

0.80.30.70.30.7

+/- 1.2

Total: 99.9Includedin "Others": N/A


Thin-Section Comments:About 12% of matrix is relatively coarsely crystalline zeolite."Devitrified Lithics" includes subordinate glassy & zeoliticfragments. Porosity count is probably low.




DCF COMPILED BY: J.R. Connolly DIV: 6315 (UNM) Date: 9/24/91========= ========= ========= ========= ========= ========= =========

-47-





Thin-Section ID s: G-1617.0-A, Gl-1617.0-B

Welding: NonweldedLithologic Type: Zeolitized, minor clayType of Pore-Filling Material: Zeolite


Constituents






Amount (%)

49.00.0

37.01.05.00.00.02.01.01.00.00.00.04.0

Est Error(95% Conf)

+1- 2.9

�1 -

+1 -+1 -

+1 -+1 -+1 -

2.80.61.2

0.80.60.6

+/- 1.1



Thin-Section Comments:Pores include unfilled bubbles in pumice, partly filled leachedareas in perlite (clinoptilolite), leached areas in pumice.Zeolites are commonly fairly large, 5 to 20 microns.



QA LEVEL OF DATA- YMP DRMS DATA SET SNL DATAGATHERING ACTIVITY: TBD ID: /L04-4/19/90 REPT #: SAND91-7031

DCF COMPILED BY: J.R. Connolly DIV: 6315 (UNM) Date: 9/24/91===== ===== ===== ====_ ===== ==== ===== =====-==== ===== ===== ====

I

-48-



Sample ID: G1-1665.5 Sample Origin: Drill Hole USW G-1Location: Depth 1,665.5 ft Test : 1========== == == == == == == == == == == == == == == == == == == == =


Thin-Section ID s: G-1665.5-A, G-1665.5-B

Welding: NonweldedLithologic Type: Zeolitized, minor clayType of Pore-Filling Material: Zeolite


Constituents






Amount (%)

45.00.040.0

1.05.00.00.02.51.01.50.00.00.04.0

Est Error(95% Conf)

+/- 2.8

4/ -

4/ -

4/ -

4/-4/-4/ -

2.80.61.2

0.90.60.7

4/- 1.1



Thin-Section Comments:Leached areas in perlite and pumice pores commonly lined withclinoptilolite 20 to 50 microns across. Clays relativelyminor, usually in pumice.





-49-



Sample ID: G-1668.1 Sample Origin: Drill Hole USW G-1Location: Depth 1,668.1 ft Test #: 1





Constituents







Amount (%)

53. 00.0

32.02.06.00.00.02.00.01.00.00.00.04.0

Est Error(95% Conf)

+/- 4.1

+/- 3.8+/- 1.1+/- 2.0

+/- 1.1

+/- 0.8

+/- 1.6

Total: 100.0Includedin "Others": Trace plagioclase, biotite, opaque oxides.


Thin-Section Comments:Matrix incl minor recognizable shard relics, and local opalinesilica as pore filling in pumice and microfractures. Only "A"section counted due to excessive plucking in "B".





-50-

i








Constituents






Amount (%)

50.=00.0

28.03.09.00.00.02.01.03.00.00.00.04.0

Est Error(95% Conf)

+/- 3.0

+1 -+1 -+1 -

+1 -+1 -+1 -

2.71.01.7

0.80.61.0

+/- 1.2

Total: 100. 0Includedin "Others": Trace biotite, opaque oxides.


Thin-Section Comments:Matrix incl minor recognizable shard relics. Feldspar and quartzshow prominent shock features (fractures, rare kink bands).Pores in pumice partly filled and perlite replaced with zeolite.





-51-





Thin-Section ID s: Gl-1741.8-A, G-1741.8-B

Welding: NonweldedLithologic Type: Zeolitized, clayType of Pore-Filling Material: Zeolite, clay


Constituents







Amount (%)

47.00.0

34.06.01.02.00.03.01.03.00.00.00.03.0

Est Error(95% Conf)

+/- 3.0

+1 -+1 -+1 -+1 -

+1 -+1 -+1 -

2.81.40.60.8

1.00.61.0

+/- 1.0

Total: 100.0Includedin "Others": Trace biotite, hornblende, opaque oxides.


Thin-Section Comments:Zeolitization is very extensive and coarse (to 60 microns).Later argillic alteration produced clay rims on fragments andlining pores. Clinoptilolite clearly the dominant zeolite.





-52-



Sample ID: G-1784.8 Sample Origin: Drill Hole USW G-1Location: Depth 1,784.8 ft Test : 1


Thin-Section ID s: G-1784.8

Welding: VolcaniclasticLithologic Type: ZeolitizedType of Pore-Filling Material: None noted


Constituents==================== =






Total:

Amount (%)

44.00.00.02.0

10.016.0

0.08.0

10.04.00.00.03.03.0

100.0

Est Error;(95% Conf) -

+/- 4.2

+1-+1-+1-

+1 -+1-+1-

1.22.53.1

2.32.51.7

+/- 1.4+/- 1.4

biotite, hornblende, opaques.Includedin "Others": 3% "other" lithics; trace


Thin-Section Comments:Rock is volcaniclastic sandstone; zeolitized lithics and matrixdominant. Non-zeolitized fragments tend to be angular. Claysare common rimming all clast types.





-53-

I



Sample ID: Al-2000 Sample Origin: Drill Hole UE25a#lLocation: Depth 2,000 ft Test #: 1


Thin-Section ID #s: A-2000

Welding: Dense to moderateLithologic Type: Silica-feldsparType of Pore-Filling Material: None


Constituents






Amount (%)

36.022.019.0

0.03.00.00.06.03.02.50.08.50.00.0

Est Error(95% Conf)

+/- 3.9+/- 3.4+/- 3.2

+/- 1.4

+1 -+1 -+1 -

1.91.41.3

+/- 2.3

Total: 100. 0Includedin "Others": N/A


Thin-Section Comments:Matrix, shards, and pumice are all devitrified and identifiedby different cryst. textures. Fe-Ti oxides are disseminated inmatrix, hematite dominates, highly oxidized. No large pores.




DCF COMPILED BY: J.R. Connolly DIV: 6315 (UNM) Date: 9/24/91====== ===== ====== ===== ===== ====== ===== ===== ====== ===== =====

-54-



Sample ID: Gl-2067 Sample Origin: Drill Hole USW G-lLocation: Depth 2,067 ft Test : 1


Thin-Section ID s: Gl-2067-A and Gl-2067-B

Welding: PartialLithologic Type: ZeolitizedType of Pore-Filling Material: Clay, some zeolite








_____________

Est Error(95% Conf)

+/- 2.9+/- 1.4+/- 2.6

+/- 1.3+/- 1.0

+1 -+1 -+1-

0.81.01.0

+/- 0.8



Thin-Section Comments:Extensively zeolitized, but may be partially glassy. Clays aredominant filling microfractures, and clay is abundant (withzeolites) replacing pumice and locally in matrix.





-55-



Sample ID: Gl-2170 Sample Origin: Drill Hole USW G-1Location: Depth 2,170 ft Test : 1


Thin-Section ID #s: Gl-2170

Welding: NonweldedLithologic Type: ZeolitizedType of Pore-Filling Material: Zeolite, opal


Constituents






Amount (%)

56.=05.0

20.02.05.00.00.04.04.03.00.00.00.01.0

Est Error(95% Conf)

+/- 3.2+/- 1.4+/- 2.6+/- 0.9+/- 1.4

+1-+1 -+1 -

1.31.31. 1

+/- 0.6

Total: 100.0Includedin "Others": Trace biotite, oxides, hornblende.


Thin-Section Comments:Alteration includes zeolitization, hematitic oxidation, andbrownish opal filling lower parts of pores. Fragments are well-sorted suggesting winnowing of fines or reworking.





7

-56-



Sample ID: Gl-2274 Sample Origin: Drill Hole USW G-1Location: Depth 2,274 ft Test #: 1



Welding: PartialLithologic Type: Zeolitized, oxidizedType of Pore-Filling Material: Zeolite


Constituents=






Amount (%)

56.09.0

14.04.00.00.00.04.03.03.00.01.00.06.0

_____________

Est Error(95% Conf)

+1-+1-+1 -+1 -

+1 -+1 -+1 -

3.31.92.31.3

1.31.11.1

+/- 0.7

+/- 1.6

Total:Includedin "Others": Trace biotite.

100.0


Thin-Section Comments:Matrix is altered to brown, semi-opaque, non-reflective material.Many "gas" pores in matrix. Zeolite fills many pores. Lithicfragments are notably absent; Fe-Ti oxides marginally oxidized.




DCF COMPILED BY: J.R. Connolly DIV: 6315 (UNM) Date: 9/24/91===== ==== ===== ==== ==== ===== ==== ===== ==== ==== ===== ==== ====

-57-






Welding: Nonwelded to partialLithologic Type: ZeolitizedType of Pore-Filling Material: Zeolite, opal


Constituents







Amount (%)

48.011.015.05.00.00.00.06.57.53.00.50.50.03.0

Est Error(95% Conf)

+1 -+1 -+1 -+1 -

+1 -+1 -+1 -+1 -+1 -

3.11.92.21.4

1.51.61.10.40.4

+/- 1.1_____________

Total: 100.0Includedin "Others": Trace hornblende, lithic fragments.


Thin-Section Comments:Very similar to G1-2274, but shows more extensive zeolite porefilling, more phenocrysts and more biotite. Alteration processincl hydration, zeolitization, "opalization" and late oxidation.





t

-58-





Thin-Section ID s: Gl-2284-A and Gl-2284-B

Welding: PartialLithologic Type: Zeolitized, glassyType of Pore-Filling Material: Zeolite

Thin-Section Mode Estimated by: Point Count--#Points:l000

Constituents






Est Error(95% Conf)Amount (%)

49.014. 013.0

0.00.00.00.07.07.02.01.00.00.07.0

+/- 3.2+/- 2.2+/- 2.1

+1 -

+1 -+1 -

1.61.60.90.6

+/- 1.6_____________

Total: 100.0Includedin "Others": Trace lithic fragments and Fe-Ti oxides.


Thin-Section Comments:Much matrix is brownish and isotropic (glass?). Clinoptiloliteand lesser mordenite are prominent replacing leached glass, andprobably in matrix. Fe-Ti oxides appear highly altered.





-59-



Sample ID: Al-2389 Sample Origin: Drill Hole UE-25a#1Location: Depth 2,389 ft Test #: 1


Thin-Section ID ffs: Al-2389

Welding: Moderate?Lithologic Type: Silica-feldsparType of Pore-Filling Material: None noted








Est Error(95% Conf)

+/- 3.6

+/- 1.1

-I-I -+1 -+1 -+1 -

2.31.62.10.80.8

+/- 1. 1



Thin-Section Comments:Welding and constituents indefinite because of devitrification.Fiamme structure in hand specimen suggests moderate welding.All but very distinct constituents counted as matrix.





-60-

r

Petrographic Data Compilation for the Yucca Mountain Project SEPDB- (Thin-Section Data)


Sample ID: Al-2429 Sample Origin: Drill Hole UE-25a*1Location: Depth 2,429 ft Test #: 1


.

Thin-Section ID s: A-2429

Welding: Partial to moderateLithologic Type: Silica-feldsparType of Pore-Filling Material: None noted


Constituents







Amount (%)

81.00.00.00.01.00.00.0

10.02.03.01.02.00.00.0

________100.0100. O

Est Error(95% Conf)

+/- 3.2

+/- 0.8

+1 -+1-+1 -+1 -

2.41.11.40.81.1

Total:

I

I

II

Includedin "Others": Trace zircon, apatite.


Thin-Section Comments:Matrix textures largely destroyed by crystallization; weldingbased on examination of hand sample textures. Only texturallydistinct lithics counted.



QA LEVEL OF DATA- YMP DRMS DATA SET SNL DATAGATHERING ACTIVITY: TD ID: 51/L04-4/19/90 REPT #: SAND91-7031


-61-






Welding: ModerateLithologic Type: Glassy, zeolitizedType of Pore-Filling Material: Zeolite, opal


Est Error(95% Conf)Constituents






Amount (%)

53. 010.019.03.00.00.00.04.54.52.00.01.00.03.0

+1 -+1 -+1 -+1 -

+1 -+1 -+1 -

3.11.92.41. 1

1.31.30.9

+1- 0.6

+1- 1.1

Total: 100.0Includedin "Others": Trace biotite and pyroxene or amphibole.


Thin-Section Comments:Welding texture without silica/feldspar devitrification isunusual. Clinoptilolite and minor mordenite are abundant butvery fine, and brownish opal replaces some glass fragments.





-62-



Sample ID: G-2338 Sample Origin: Drill Hole USW G-1Location: Depth 2,338 ft Test #: 1


Thin-Section ID #s: Gl-2338-A and Gl-2338-B

Welding: ModerateLithologic Type: Silica-feldsparType of Pore-Filling Material: None (See comments)


Constituents






Amount (%)

65.05.08.00.00.00.00.06.07.03.00.50.50.05.0

Est Error(95% Conf)

+1 -+1 -+1-

+1 -+1 -+1-+1 -+1-

3.01.41.7

1.51.61.10.40.4

+/- 1.4

Total___100_0Total: 100.0

Includedin "Others": N/A


Thin-Section Comments:Devitrification textures include axiolitic, spherulitic, coarse"vapor phase" pore filling, and microcrystalline mosaics. Muchcounted porosity may be artifact of thin section preparation.





-63-

_ !~~~~~~~~~~~~~~~~~~~~~~~~~



Sample ID: Al-2499 Sample Origin: Drill Hole UE-25a#1Location: Depth 2,499 ft Test #: 1


Thin-Section ID s: A-2499

Welding: Partial to moderate?Lithologic Type: Silica-feldsparType of Pore-Filling Material: Silica-feldspar?


Constituents






Amount (%)

77.00.00.00.00.00.00.09.06.07.00.31.00.00.0

Est Error(95% Conf)

+/- 3.4

+/- 2.3+/- 1.9+/- 2.1+/- 0.4+/- 0.8

_____________

Total: 100.3Includedin "Others": Trace apatite, zircon.


Thin-Section Comments:Devitrification has destroyed shard textures; welding indicatedby examination of hand specimen. Pore filling is sperulitic,possibly cristobalite. All phenocrysts highly fractured.





-64-

7



Sample ID: Gl-2367 Sample Origin: Drill Hole USW G-lLocation: Depth 2,367 ft Test #: 1



Welding: Moderate(?)Lithologic Type: Silica-feldsparType of Pore-Filling Material: None noted


-i

Constituents







Amount (%)

77.04.00.00.00.00.00.06.04.05.01.00.00.03.0

Est Error(95% Conf)

+/- 2.7+/- 1.2

+1-+1 -+1 -+1-

1.51.21.40.6

+/- 1.1

Total: 100.0Includedin "Others": Trace Fe-Ti oxides, lithic fragments.


Thin-Section Comments:Matrix is devitrified, obscuring original textures: "Shards"are discrete coarsely crystalline areas, and welding texturesare largely destroyed. Some pores are from thin sect plucking.





-65-








Constituents






Amount (%)

74.08.00.00.00.50.00.05.05.04.01.00.50.02.0

Est Error(95% Conf)

+/- 2.8+/- 1.7

+/- 0.5

+1 -+1-+1 -+1 -+1 -

1.41.41.30.60.5

+/- 0.9

Total: 100.0Includedin "Others": None.


Thin-Section Comments:Matrix is devitrified, obscuring original textures: "Shards"are discrete coarsely crystalline areas, and welding texturesare largely destroyed. Some pores are from thin sect plucking.





-66-






Welding: Welded(?)-see commentsLithologic Type: Silica-feldsparType of Pore-Filling Material: None noted


Constituents------------------- =







Amount (%)

76.05.00.00.00.00.00.06.06.05.00.51.50.00.0

Est Error(95% Conf)

+/- 2.7+/- 1.4

+1 -+1 -+1 -+1 -+1 -

1.51.51.40.40.8

Total:Includedin "Others": Trace porosity.

100.0


Thin-Section Comments:Textural evidence for welding destroyed by devitrification butwelding indicated by position between welded samples. Containshigh percentage of coarsely crystalline matrix (37% of mode).





-67-






Welding: Welded(?)-see commentsLithologic Type: Silica-feldsparType of Pore-Filling Material: None noted


Constituents






Amount (%)

82.00.00.00.00.00.00.05.05.04.00.50.50.03.0

Est Error(95% Conf)

+1- 2.3

+1 -+1 -+1 -+1 -+1 -

1.31.31.20.40.4

+/- 1.0

Total:________100_0

100.0Includedin "Others": Trace lithic fragments.


Thin-Section Comments:Textural evidence for welding destroyed by devitrification butwelding indicated by position between welded samples. Enhancedporosity (bubbles) in coarse spherulitic matrix (8% of mode).





-68-





Thin-Section ID s: G-2428-A and Gl-2428-B



Constituents






Total:

Amount (%)

78.00.00.0

: ~0.01.00.00.09.07.03.01.00.00.01.0

100.0

Est Error(95% Conf)

+/- 2.3

+/- 0.6

+1 -+1-+1 -+1 -

1.61.41.00.6

+/- 0.6

Includedin "Others": Trace Fe-Ti oxides.


Thin-Section Comments:Welding textures obscured by devitrification. Coarsely crystmatrix is abundant (32 modal%) and includes Fe2O3-rich zones(2%). Alkali feldspars show 10-50 micron overgrowth rims.





-69-






Welding: Welded(?)-See commentLithologic Type: Silica-feldsparType of Pore-Filling Material: None noted


Constituents






Total:Includedin "Others": N/A

Amount (%)

78.00.00.00.00.00.00.0

10.05.04.01.50.50.01.0

________100.0

: 100.0

Est Error(95% Conf)

+/- 2.6

+1 -+1 -+1 -

+1 -

+1 -

1.91.41.20.80.4

+/- 0.6


Thin-Section Comments:Welding indicated by elongation of matrix; original textures areobscured by devitrification. Coarsely crystalline matrix isabundant (37 modal%) and includes discrete hematite (2%).





-70-



Sample ID: Gl-2502 Sample Origin: Drill Hole USW G-lLocation: Depth 2,502 ft Test #: 1



Welding: ModerateLithologic Type: Silica-feldspar, glassy(?)Type of Pore-Filling Material: None noted


Constituents






Amount (%)

43. 028.013.0

0.03.00.00.05.04.02.01.01.00.00.0

________100_0100. O

Est Error(95% Conf)

+/- 3.1+/- 2.8+/- 2.1

+/- 1.1

+1 -+1 -+1 -+1 -+1 -

1.41.20.90.60.6

Total:Includedin "Others": Trace pores, amphibole.


Thin-Section Comments:Rare shards are brown and semi-isotropic and may be glass; mostare crystalline. Shard percentage based on visual estimate.Some zeolite may be developed in fine matrix.





-71-

I~~~~~~~~~~~~~~~~~~~~






Welding: ModerateLithologic Type: Silica-feldspar, glassy(?)Type of Pore-Filling Material: None noted


Constituents






Amount (%)

70.07.09.00.01.00.00.04.06.02.00.50.00.00.5

Est Error(95% Conf)

+/- 2.9+/- 1.6+/- 1.8

+/- 0.6

+1 -+1 -+1 -+1 -

1.21.50.90.4

+/- 0.4

Total: 100.0Includedin "Others": Trace Fe-Ti oxides.


Thin-Section Comments:Only texturally distinct shards counted; indistinct relictshards are included with matrix. Pumice fiamme are large,flattened, spherulitic areas with oxidized rims.





-72-





Thin-Section ID #s: G-2538-A and Gl-2538-B

Welding: Moderate to partialLithologic Type: Silica-feldspar, glassy(?)Type of Pore-Filling Material: None noted


Constituents







Amount (%)

77.00.09.00.02.00.00.04.05.02.00.01.00.00.0

Est Error(95% Conf)

+/- 2.7.

+/- 1.8

+/- 0.9

+1 -+1 -+1-

1.21.40.9

+/- 0.6

Total: 100.0Includedin "Others": Trace biotite, altered sphene, amphibole, pores.


Thin-Section Comments:Relict shards are included with matrix in point count; rarebrown semi-isotropic shards may be partly glassy. Elongatefiamme-like spherulitic areas are counted as pumice.





-73-






Welding: Partial to moderateLithologic Type: ZeolitizedType of Pore-Filling Material: Zeolite


Constituents






Total:

Amount (%)

33.024.019.00.06.00.00.05.06.00.03.00.01.03.0

_________00_0

: 100.0

Est Error(95% Conf)

+/- 3.0+/- 2.7+/- 2.5

+/- 1.5

+/- 1.4+/- 1.5

+/- 1.1

+/- 0.6+/- 1.1

Includedin "Others": 1% hornblende counted, trace biotite.


Thin-Section Comments:Some glass may remain, but all matrix is strongly zeolitizedwith shards and pumice identified by relict textures. Shardshave been leached and partly replaced by zeolite, leaving pores.





-74-






Welding: ModerateLithologic Type: Zeolitized, glassyType of Pore-Filling Material: Zeolite


Constituents=====================







Total:

Amount (%)

39.028.013.0

0.02.50.00.05.05.04.00.50.00.03.0

________100.0

: 100. O

Est Error(95% Conf)

+/- 3.4+/- 3.1+/- 2.4

+/- 1.1

+1 -+1 -+1 -+1 -

1.51.51.40.5

+/- 1.2

Includedin "Others": Trace hornblende, Fe-Ti oxides.


Thin-Section Comments:Zeolitization is extensive throughout matrix, pumice and shardsalthough some glass may remain. Pores commonly zeolite-lined.Section contains a prominent microfault (with fine, dark fill).





-75-

I






Welding: PartialLithologic Type: ZeolitizedType of Pore-Filling Material: Zeolite


Constituents






Total:

Amount (%)

45.017.024.0

0.00.01.00.05.03.03.00.01.00.01.0

________100_0

100.0

Est Error(95% Conf)============

+1-+1 -+1-

3.12.42.7

+/- 0.6

+1 -+1 -+1-

1.41.11.1

+/- 0.6

+/- 0.6

Includedin "Others": Trace hornblende, biotite, epidote(?).


Thin-Section Comments:Zeolite (clinoptilolite w/ minor mordenite) is extensive possiblywith some opal-CT. Zeolitic lithics are usually indistinct frommatrix. Visible porosity (>30 micron) reduced by zeolite fill.





-76-



Sample ID: G-2658Location: Depth 2,658 ft

Sample Origin: Drill Hole JSW G-1Test #: 1



Welding: Nonwelded(?)Lithologic Type: Zeolitized, glassy(?)Type of Pore-Filling Material: Zeolite(?)

Thin-Section Mode Estimated by: Visual Estimate

Constituents






Amount (%)

81.00.05.00.01.01.00.03.04.02.01.00.00.02.0

Est Error(95% Conf)

Total: 100.0Includedin "Others": Trace Fe-Ti oxides, zircon


Thin-Section Comments:Matrix appears nonwelded, but textures are obscured by altera-tion. Coarse zeolite is uncommon but matrix appears crystallineunder high magnification. Matrix may be partially glassy.



QA LEVEL OF DATA-GATHERING ACTIVITY: TBD

YMP DRMS DATA SETID: 51/L04-4/19/90

SNL DATAREPT #: SAND91-7031

DCF COMPILED BY: J.R. Connolly DIV: 6315 (UNM) Date: 9/2I,'* != = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = _ _

-77-





Thin-Section ID s: G1-2928.6

Welding: ModerateLithologic Type: Silica-feldsparType of Pore-Filling Material: None noted


Constituents






Amount (%)

47. 020.010.0

0.05.00.00.06.06.03.01.01.00.01.0

Est Error(95% Conf)

+/- 4.6+/- 3.7+/- 2.8

+/- 2.0

+1 -+1 -+1 -+1 -+1 -

2.22.21.60.90.9

+/- 0.9

Total:Includedin "Others": Trace calcite.

100.0


Thin-Section Comments:Shards, pumice recognized by shapes; now all devitrified.Welding indicated by elongation of relict fragments. Alllithic fragments are devitrified.





-78-





Thin-Section ID s: G1-2939

Welding: Moderate?Lithologic Type: Silica-feldsparType of Pore-Filling Material: None noted


Constituents







Est Error(95% Conf)Amount (%)

46.030.0

0.00.05.00.00.05.06.04.01.03.00.00.0

+/- 4.4+/- 4.0

+/- 1.9

+1 -+1 -+1 -+1 -+1 -

1.92.11.70.91.5

_____________

Total: 100.0Includedin "Others": Trace porosity, calcite.


Thin-Section Comments:Overall fabric suggests moderate welding, but delicate Y and Vshaped shards are well preserved and only slightly deformed.All phenocrysts fractured. Calcite replaces plagioclase cores.





-79-

APPENDIX B :

DATA COMPILATION FOR WHOLE-ROCK CHEMICAL ANALYSES

e

-80-

Bulk Chemistry Data Compilation for the Yucca Mountain Project SEPDB


SAMPLE ID: G-1245 SAMPLE ORIGIN: Drill Hole USW G-1LOCATION: Depth 1,245 ft TEST : 1

Part 2. PARAMETERSWhole-Rock Analysis Results

Whole-Rock Analysis IDs: Gl-1245Comments: Low H20 typical for devitrified sample. High-silica

rhyolite composition. ''

*11

Estimated AnalysisI) Error MethodElement/Oxide Amount(I

CIPWNormative Minerals

============= =========

SiO2:TiO2:

A1203:Fe2O3:

FeO:MnO:MgO:CaO:

Na2O:K20:

P205:H20(+):H20(-):

76.2-0.06012.420.780.080.0570.140.483.294.86

+/- 2.3+/- 0.012+/- 0.37+/- 0.08+/- 0.02+/- 0.011+/- 0.01+/- 0.05+/- 0.10+/- 0.15

G . Quartz:AA. Corundum:AA- Orthoclase:

-AA,V Albite:V Anorthite:AA Hypersthene:AA Magnetite:AA Hematite:AA Ilmenite:AA Rutile:C Apatite:

H20:G

37.830.87

29.2428.282.430.360.270.600.12

j.0.75 +/- 0.230.52 +/- 0.16

Norm Total: 100.00Total:

Total Fe as Fe2O3:Loss on Ignition:

99.637

0.87 +/- 0.090.75 +/- 0.23

Differentiation index:AA Qtz+Orth+Alb= 95.35G'..

I1

Notes: 1. H20(+) includes H20, C02 & other volatiles.2. Norms for samples are based on analyses-normalized to 100%

excluding all H20 from the norm. CIPW normative mineralsare reported in weight percents.

3. Error values shown are based on acceptance criteria forwhole-rock analyses-specified in SAND91-7031. Decimalplaces shown approximate the precision for that element.

Key to Analysis Method:'XRF=X-ray fluorescence; V=volumetric analysis;AA=atomic absorption; G=gravimetric analysis; C=colorimetric analysis.



QA LEVEL OF DATA YMP DATA SET SNL DATAGATHERING ACTIVITY: TBD ID: 51/L04-4/19/90 REP #: SAND91-7031


-81-



SAMPLE ID: Al-1569 SAMPLE ORIGIN: Drill Hole UE25a#1LOCATION: Depth 1,569 ft TEST : 1


Whole-Rock Analysis IDs: Al-1569Comments: About 8% total H20 content indicates partial zeolitization.

Shows higher CaO and less Na2O than to devitrified samples.

Element/Oxide Amount(%)

SiO2: 72.0TiO2: 0.060

A1203: 11.73Fe2O3: 0.86

FeO: 0.01MnO: 0.065MgO: 0.04CaO: 1.69

Na2O: 1.46K20: 4.50

P205: 0.010H20(+): 4.68H20(-): 2.91

Total: 100.015

EstimatedError

+/- 2.2+/- 0.012+/- 0.35+/- 0.09+1 -+1 -+1 -+1-�1 -+1 -+1 -

AnalysisMethod

GAAAA

AA, VVAAAAAAAAAA

CGG

0.0130.010.050.040.14

Quartz:Corundum:

Orthoclase:Albite:

Anorthite:Hypersthene:

Magnetite:Hematite:Ilmenite:

Rutile:Apatite:

H20:


46.151.50

28.7913.35

9. 020.090.080.880.12

0. 03+/- 0.47+/- 0.29

Norm Total: 100.01

Differentiation index:Qtz+Orth+Alb= 88.29Total Fe as Fe2O3:

Loss on Ignition:0.87 +/- 0.094.68 +/- 0.47

AAG

Notes: 1. H20(+) includes H20, C02 & other volatiles.2. Norms for samples are based on analyses normalized to 100%


3. Error values shown are based on acceptance criteria forwhole-rock analyses specified in SAND91-7031. Decimalplaces shown approximate the precision for that element.

Key to Analysis Method: XRF=X-ray fluorescence; V=volumetric analysis;AA=atomic absorption; G=gravimetric analysis; C=colorimetric analysis.

Part 3. EXPERIMENT CONDITIONSStandard. See SAND9l-7031 for details of procedures followed.




-82-

4



SAMPLE ID: Al-2000 SAMPLE ORIGIN: Drill Hole UE25a#1LOCATION: Depth 2,000 ft TEST #: 1


Whole-Rock Analysis IDs: Al-2000Comments: Low H20 content typical for devitrified sample.


SiO2: 75.9TiO2: 0.080

A1203: 11.90Fe2O3: 1.75

FeO: 0.14MnO: 0.032MgO: 0.07CaO: 0.38

Na2O: 3.59K20: 4.77

P205: 0.012H20(+): 0.77H20(-): 0.22

Total: ____614Total: 99.614

Estimated AnalysisError Method

========= --------

CIPWNormative Minerals===============-==

+/- 2.3+/- 0.016+/- 0.36+/- 0.05+/- 0.01+/- 0.006+/- 0.01+/- 0.04+/- 0.11+/- 0.14+/- 0.002+/- 0.23+/- 0.07

GAAAA

AA, VV

AAAAAAAAAA

CGG

Quartz:Corundum:

Orthoclase:Albite:



Rutile:Apatite:

H20:

36.380.15

28.6130.771.840.190.331.550.15

0.03

- Norm Total: 100.00

Differentiation index:Qtz+Orth+Alb= 95.76Total Fe as Fe2O3: 1.91

Loss on Ignition: 0.76+/- 0.06+/- 0.23

AAG

Notes: 1. H20(+) includes H20, C02 & other volatiles.2. Norms for samples are based on analyses normalized to 100t


3. Error values shown are-based on acceptance criteria forwhole-rock analyses specified in SAND91-7031. Decimalplaces shown approximate the precision for that element.




QA LEVEL OF DATA YMP DATA SET SNL DATAGATHERING ACTIVITY: TBD ID: 51/L04-4/19/90 REP : SAND91-7031


-83-



SAMPLE ID: Al-2429 SAMPLE ORIGIN: Drill Hole UE25a#1LOCATION: Depth 2,429 ft TEST #: 1


Whole-Rock Analysis IDs: Al-2429Comments: Low H20 typical for devitrified sample.

rhyolite composition, highly oxidized.High-silica


SiO2: 75.2TiO2: 0.080A1203: 13.22Fe2O3: 1.22

FeO: 0.01MnO: 0.076MgO: 0.10CaO: 0.47

Na2O: 3.14K20: 5.13

P205: 0.020H20(+): 0.85H20(-): 0.32

EstimatedError

-I-, -+1 -+1 -+1 -.4-/ -

+1-+1-+1 -+1 -+1 -+1 -+1 -+1 -

2. 30.0160.400.04

0.0150. 010.050.090.150.0040.260.10

AnalysisMethod

GAAAA

AA ,VV

AAAAAAAAAA

CGG


Quartz: 36.70Corundum: 1.69

Orthoclase: 30.74Albite: 26.89

Anorthite: 2.26Hypersthene: 0.26

Magnetite: 0.05Hematite: 1.20Ilmenite: 0.15Rutile:

Apatite: 0.05H20:

Norm Total: 99.99Total:


99.336Differentiation index:

Qtz+Orth+Alb= 94.331.23 +/- 0.040.85 +/- 0.26

AAG





Part 3. EXPERIMENT CONDITIONSStandard. See SAND91-7031-for details of procedures followed.


QA LEVEL OF DATA YMP DATA SET SNL DATAGATHERING ACTIVITY:. TBD ID: 51/L04-4/19/90 REP #: SAND91-7031

DCF COMPILED BY: J.R. Connolly DIV: 6315 (UNM) Date: 9/23/91= = = = = = = = = = = = = = = = = = = = = = = _ = = = = = = = = = = = = = -== = = = = = = = = = = = = = = = = = = = = = = _ = = =-

-84-



SAI4PLE ID: G1-2939.3 SAMPLE ORIGIN: Drill Hole USW G-1LOCATION: Depth 2,939.3 ft TEST #: 1


Whole-Rock Analysis IDs: Gl-2939Comments: Low H20 typical for devitrified sample.

rhyolite composition.High-silica

Element/Oxide Amount(%)Estimated AnalysisError Method


SiO2:TiO2:

A1203:Fe2O3:

FeO:MnO:MgO:CaO:

Na2O:K20:P205:

H20(+):H20(-):

76.60. 110

12.401.170.160.0410.140.733.124.910.0280.900.28

+1 -+1 -+1 -+1-+1-+1-+1 -+1 -+1 -+1 -+1 -+1 -+1 -

2.30 0110.370.040.020.0080.010.070.090.150.0060.270.08

GAAAA

AA,VV

AAAAAAAAAA

CGG

Quartz:Corundum:

Orthoclase:Albite:



Rutile:Apatite:

H20:

38.210.67

29.2126.523.490.340.330.950.21

0.07

T o t a l :_ _0 0 _5 8

Total: 100.589---- Norm Total: 100.00

Differentiation index:AA Qtz+Orth+Alb= 93.94G


1.35 +/- 0.040.90 +/- 0.27









-85-

APPENDIX C

DATA COMPILATION FOR QUALITATIVE X-RAY DIFFRACTION ANALYSES

-86-

X-Ray Diffraction Data Compilation, Yucca Mountain Project SEPDB(Qualitative Results only)


SAMPLE ID: Gl-1245 SAMPLE ORIGIN: Drill Hole USW G-1LOCATION: Depth 1,245 ft TEST : 1

Part 2. PARAMETERSX-Ray Diffraction (XRD) Analysis Results

XRD Analysis IDs: G-1245-KKInitial data collected on 9/30/81 using filename: NA

Mineral and Glass Identification by X-Ray Diffraction

MineralCriteria Amountfor ID** Est.(@) Mineral

Criteriafor ID**

AmountEst. ()=======

Silica Phases--------Quartz: Y

Cristobalite: YTridymite:

Opal-CT:Feldspars------------

Plagioclase: PriSanidine: Pri

Anorthoclase: PriOrthoclase:Microcline:

Zeolites-------------Clinoptilolite:

Mordenite:Phillipsite:Heulandite:

Analcime:

es Majes Maj

obobob

Maj?Maj?Maj?

Clays----------------Montmorillonite: Yes Min

Illite:Smectite:Saponite:Chlorite:

Other Clays:Other Phases---------

Glass:Calcite:

Aragonite:All Others:

** ID Criteria:Yes = Positive IDProb = Probably PresentPoss = Possibly PresentBlank = Not identified

XRD Data Restrictions: NoneNote : Qualitative Estimate. Maj=Major Phase; Min=Minor; Tr=Trace

Other Clays: Not IdentifiedOther Phases: None IdentifiedNotes on XRD Analysis:

Feldspar presence definite, but no individual phases identifiedhence "Prob" and "Maj?" designations above. Montmorillonite IDby prominent broad peak centered at about 5.2 deg 2-theta.Cristobalite identified by re-examination of original data.Quartz provides strongest peak in pattern.

Part 3. EXPERIMENT CONDITIONSSee SAND91-7031 experiment conditions and procedures.


QA LEVEL OF DATA YMP DRMS DATA SET SNL DATAGATHERING ACTIVITY: TBD ID: 51/L04-4/19/90 REPT #: SAND91-7031


-87-



SAMPLE ID: Al-1569 SAMPLE ORIGIN: Drill Hole UE-25a#lLOCATION: Depth 1,569 ft TEST #: 1


XRD Analysis IDs: A-1569-MMInitial data collected on 9/30/81 using filename: NA


CriteriaMineral for IDk*

Silica Phases--------Quartz: Poss

Cristobalite:Tridymite:

Opal-CT: ProbFeldspars------------

Plagioclase: ProbSanidine: Prob

Anorthoclase: ProbOrthoclase:Microcline:

Zeolites-------------Clinoptilolite: Yes


Analcime:

AmountEst. (@) Mineral

Criteriafor ID**

Tr

Tr

MinMinMin

Maj

Clays----------------Montmorillonite: Yes

Illite: PossSmectite:Saponite:Chlorite: Poss


Glass: YesCalcite:


AmountEst. ()

MinTr

Tr

Maj?

** ID Criteria:Yes = Positive IDProb = Probably PresentPoss = Possibly PresentBlank = Not identified====================:==========



Feldspar is definitely present; individual phases NOT identified.Glass "hump" in XRD pattern is notable but not large. Opal-CT isidentified by peak at 21.8 deg 2-theta. Montmorillonite peak isbroad but definite; other clays are not well defined in pattern.Quartz and opal-CT not identified in original 1982 report.





-88-



SAMPLE ID: Al-2000 SAMPLE ORIGIN: Drill Hole UE25a#lLOCATION: Depth 2,000 ft TEST #: 1


XRD Analysis IDs: A-2000-NNInitial data collected on 9/30/81 using filename: NA


MineralCriteriafor ID**

AmountEst. () Mineral

Criteria Amountfor ID** Est.(@)

Silica Phases--------Quartz: Ye



Plagioclase: Pr4Sanidine: Pr4

Anorthoclase: Pr(Orthoclase:Microcline:



Analcime:

es Maj

o)bo)bo)b

Maj?Maj?Maj?

Clays----------------Montmorillonite:

Illite:Smectite:Saponite:Chlorite:


Glass:Calcite:



XRD Data Restrictions: NoneNote 0: Qualitative Estimate. M=Major Phase; Min=Minor; Tr=Trace


only quartz and feldspar identified in XRD pattern. Feldspar isdefinitely present, but individual phases were not identified,hence the probable and "Maj?" designations above. Chabazite,tentatively identified as possible phase in original 1982 report,is not supported by reexamination of the original data.



QA LEVEL OF DATA YMP DRMS DATA SET SNL DATAGATHERING ACTIVITY: TBD ID: 51/L04-4/19/90. REPT : SAND91-7031


-89-



SAMPLE ID: Al-2429 SAMPLE ORIGIN: Drill Hole UE-25a#1LOCATION: Depth 2,429 ft TEST #: 1


XRD Analysis IDs: A-2429-00Initial data collected on 9/30/81 using filename: NA


MineralCriteria Amountfor ID** Est.(@) Mineral

Criteria Amountfor ID** Est.(Q)

Silica Phases--------Quartz: Y(



Plagioclase: Pr(Sanidine: Prc

Anorthoclase: PrcOrthoclase:Microcline:



Analcime:

es MajClays----------------Montmorillonite: Poss

Illite: PossSmectite:Saponite:Chlorite:

Other Clays: PossOther Phases---------

Min?Min?

Min?Obobob

Maj?Maj?Maj? Glass:

Calcite:Aragonite:All Others:

** ID Criteria:Yes = Positive IDProb = Probably PresentPoss = Possibly PresentBlank = Not identified==============================

XRD Data Restrictions: NoneNote : Qualitative Estimate. Maj=Major Phase; Min=Minor; Tr=Tracea

Other Clays: Kaolinite (12.4 deg 2-theta) possibleOther Phases: None IdentifiedNotes on XRD Analysis:

Feldspar presence definite, but no individual phases identifiedhence "Prob" and "Maj?" designations above. Some clays presentbut original (3/82) identifications are not good; data above isreinterpretation of original data. Quartz dominates pattern.



QA LEVEL OF DATA YMP DRMS DATA SET SNL DATAGATHERING ACTIVITY: TBD ID: 51/L04-4/19/90 REPT : SAND91-7031


-90-



SAMPLE ID: G1-2939.3 SAMPLE ORIGIN: Drill Hole USW G-1LOCATION: Depth 2,939.3 ft TEST #: 1


XRD Analysis IDs: G-2939-LLInitial data collected on 9/30/81 using filename: NA


Mineral================

Criteria Amountfor ID** Est.(Q) Mineral

================

Criteriafor ID**

AmountEst. ()

Silica Phases--------Quartz: Yes



Plagioclase: ProbSanidine: Prob

Anorthoclase: ProbOrthoclase:Microcline:



Analcime:

Maj

Maj?Maj?Maj?

Clays----------------Montmorillonite: Poss Tr

Illite: Poss MinSmectite:Saponite:Chlorite:


Glass:Calcite:





Feldspar presence definite, but no individual phases identifiedhence "Prob" and "Maj?" designations above. Illite ID by broadpeak centered at about 8.8 deg. Montmorillonite may be indicatedby very weak peak at about 6 deg. Pattern is quartz and feldspardominated.





-91-

I

APPENDIX D

DATA COMPILATION FOR ELECTRON MICROPROBE ANALYSES

-92-

Bence-Albee Corrected Feldspar Phenocryst and Matrix Analyses of Sample: USW G1 407.1

Point IDs:

Element:

SiO2A1203

FeO*

MnO

M&OCaONa2O

K20BaO

Total:

F1-F5F7,F8

64.1018.80

0.02

B-0.00B-0.00

0.695.68

8.250.22

97.76

F6 Ml.M2 +/-Std Dev

58.8022.40

0.37B-0.00

B-0.014.37

8.00

1.61B-0.00

95.55

21.069.79.2

1

1

Plag.

66.80

14.701.17

0.05

0.050.60

4.616.25

B-0.04

2.200.40

0.50

0.08

0.250.36

co

An 3.3Ab 49.4Or 47.2

94.23

3.7

50.945.4

2

10Notes:

# Anal. Avgd.:Name:

113

Sanidine

An, Ab, Or are molecular amounts of Ca, Na and K, calculated from the weight percents of CaO, Na2O and K20 and normalized

to 100?. An. A and Or are calculated for Matrix analyses ONLY for comparison with relative proportions of Ca, N and K

in feldspars.

Notes: 1 - Feldspar Phenocrysts

2 - Devitrified Shard Matrix

* All Fe is reported as FeO. Amounts shown as "B-" are reported as analyzed, but are below detection limit and not

included in totals.

Standard deviations (calculated for matrix only) are (n-i) weighted, and estimate sample errors at a 68% confidence

level. -

YMP DRMS Data Set ID: L04.A-08/01/84

Bence-Albee Corrected Feldspar Phenocryst and Matrix Analyses of Sample: USW G-1 448.9

Point IDs:

Element:SiO2

A1203

FeO*

MnO

M&O

CaO

K20BaO

Total:

F3-F8

67.8019.200.16

B-0.02B-0.00

0.52

5.380.09

98.60

F1,F2

F5,F9

65.40

21.900.15

B-0.01

B-0.002.72

o.2a1.19

B-0.03

99.64

Mdl-Md3 t/-Std Dev

M11-M13 +/-Std Dev

MF1-Dark +/- MF-1-Light +/-

Std Dev Std DevMF1-All t/-

Std Dev

77.8012.10

0.87B-0.04

0.140.44

3.673.11

B-0.01

4.10

1.90

0.97

0.170.10

0.640.74

71.20

11.90

0.380.030.400.48

2.o73.64

B-0.02

15.106.00

0.370.03

0.960.39

1.66

2.18

73.90

14.40

1.030.070.050.41

4.20

4.03B-0.04

2.100.900.330.030.030.04

0.360.30

69.40

15.50

1.05

0.070.540.50

4.14

4.34B-0.05

3.60

1.30

0.81

0.051.01

0.130.660.67

71.8014.90

1.04

0.070.280.454.174.18

B-0.04

3.601.20

0.59

0.040.720.10

0.51

0.52

98.13 90.90 98.09 95.54 96.89

IN

An 3.1Ab 58.7

Or 38.2

14.278.47.4

1

6

Plag.

4.161.6

34.3

222

See Notes

4.851.943.3

3,521

See Notes

3.259.3

37.5

411

See Notes

3.856.939.3

4.510

See Notes

3.558.2

38.4

4,521

See Notes

Notes:# Anal. Av~d.:

Name:

16

Sani dine

An, Ab, Or are molecular amounts of Ca, Na and K, calculated from the weight percents of CaO, Na2O and 20 and normalizedto 100%. An, Ab and Or are calculated for Matrix analyses ONLY for comparison with relative proportions of Ca, Na and Kin feldspars.

Notes: 1 - Feldspar Phenocrysts2 - Devitrified Shard Matrix

3 - Coarsely crystalline or "vapor phase" altered lithophysal matrix

4 - Crystalline fiamme (dark and light colored areas differentiated)

5 - Low totals due to extensive porosity in areas analyzed


included in totals.

Standard deviations (calculated for matrix only) are (n-l) weighted, and estimate sample errors at a 68% confidence

level.



Point IDs: F2-F4,F6 F1,F5,F8 Mdl +/- Mil +/- HF1-Dark +/-

F7,F9 F9 Std Dev Std Dev Std DevElement:

SiO2 64.60 62.60 72.60 3.50 65.70 11.00 69.10 1.50A1203 19.20 22.20 12.60 0.88 15.10 3.80 15.50 0.60FeO* 0.21 0.22 0.86 1.10 0.38 0.49 1.13 0.23

MnO B-0.00 B-0.00 B-0.03 B-0.01 0.07 0.02M&O B-0.00 B-0.00 0.16 0.15 B-0.00 0.09 0.05CaO 0.79 3.84 0.39 0.17 0.37 0.11 0.66 0.38Na2O 5.66 8.67 3.48 0.53 4.43 1.27 4.70 0.62K20 7.99 1.39 4.41 0.93 5.15 1.47 5.47 1.00BaO 0.30 B-0.05 B-0.02 B-0.01 B-0.03

Total: 98.75 98.92 94.50 91.13 96.72

An 3.8 18.1 3.3 2.5 4.2Ab 49.9 74.1 52.7 55.2 54.2Or 46.3 7.8 44.0 42.2 41.5

Notes: 1 1 2.5 3,5 4# Anal. Avgd.: 10 8 11 13 11

Name: Sanidine Plag. See Notes See Notes See Notes

An, Ab, Or are molecular amounts of Ca, Na and K, calculated from the weight percents of CaO, Na2O and K20 and normalizedto 100X. An, Ab and Or are calculated for Matrix analyses ONLY for comparison with relative proportions of Ca, Na and Kin feldspars.


3 - Coarsely crystalline or "vapor phase" altered lithophysal matrix4 - Crystalline fiamme (light and dark areas differentiated)


* All Fe is reported as FeO. Amounts shown as "B-" are reported as analyzed, but are below detection limit and notincluded in totals.

Standard deviations (calculated for matrix only) are (n-l) weighted, and estimate sample errors at a 68% confidencelevel.



Point IDs:

Element:

s102A1203

FeO*

MOM&OCaO

Na2O

K20BaO

Total:

F3 F4.F5

64.40

18.80B-0.02

B-0.00

B-0.000.31

4.81

9.630.19

98.14

62.80

22.30

0.11

B-0.00

B-0.003.559.001.25

B-0.01

99.01

16.676.47.0

1

Plag.

F2

57.9025.800.08

B-0.00

B-0.007.79

7.130.45

0.10

99.25

36.760.82.5

12

Ca-Plag.

Ml t/-

Std ev

77.409.81

0.39B-0.02

0.10

0.262.56

4.728-0.03

8.004.70

0.25

0.120.121.24

2.43

An 1.5Ab 42.5

Or 56.0

95.24

2.544.1

53.5

2,5

15See Notes

Notes:

# Anal. Avgd.:Name:

12

Sanidine

An, Ab, Or are molecular amounts of Ca, Na and K, calculated from the weight percents of CaO, Na2O and K20 and normalizedto 100x. An. Ab and Or are calculated for Matrix analyses ONLY for comparison with relative proportions of Ca, Na and Kin feldspars.

Notes: 1 - Feldspar Phenocrysts2 - Devitrified Shard Matrix3 - Coarsely crystalline or "vapor phase" altered lithophysal matrix

4 - Crystalline fiamme (light and dark areas differentiated)


^ All Fe is reported as FeO. Amounts shown as "-" are reported as analyzed, but are below detection limit and not

included in totals.

Standard deviations (calculated for matrix only) are (n-l) weighted, and estimate sample errors at a 68% confidence

level..


.,

.,I


Point IDs: F1,FZF6 F3-F5

F7,F8

Mal +/-

Std Dev

Mvl +/-

Std Dev

Element:SiO2

A1203

FeO*MnO

MgOCaO

Na2OK20BaO

Total:

62.3018.700.15

B-0.00

B-0.000.43

5.299.08

0.19

96.14

62.3021.60

0.17

B-0.00

B-0.003.399.10

1.23B-0.02

97.79

15.977.2

6.9

73.6012.00

0.65

B-0.010.11

0.64

4.213.61

B-0.05

3.301.70

0.25

0.07

0.33

1.192.02

66.0014.60

0.46

B-0.000.11

0.423.88

6.84B-0.07

5.302.50

0.14

0.150.110.72

1.92

ItZ-41

An 2.1Ab 46.0

Or 51.9

94.82

5.160.7

34.2

92.31

2.7

45.052.3

Notes:

# Anal. Avgd.:Name:

15

Sanidine

110

Plag.

2.510

See Notes

3.5

10See Notes

An, Ab, Or are molecular amounts of Ca. Na and K, calculated from the weight percents of CaO, Na2O and K20 and normalized

to 100S. An, Ab and Or are calculated for Matrix analyses ONLY for comparison with relative proportions of Ca, Na and K

in feldspars.

Notes: 1 - Feldspar Phenocrysts

2 - Devitrified Shard Matrix

3 - Coarsely crystalline or "vapor phase" altered lithophysal matrix.

4 - Crystalline fiamme (light and dark areas differentiated)

5 - Low totals due to porosity in areas analyzed.


included in totals.

Standard deviations (calculated for matrix only) are (n-i) weighted, and estimate sample errors at a 681 confidence

level.

YVP FVIS Data Set ID: L04.A-08/01/84


Poin

El

t IDs: F3 F1,F4-F8

F2,F10-F1Zement:

Si02 65.10 62.90A1203 18.60 22.00

FeOC 0.15 0.22

MnO B-0.00 B-0.00MgO B-0.00 B-0.00CaO 0.26 3.56Na2O 4.31 9.ObK20 10.49 1.17

BaO 0.13 B-0.02

Total: 99.04 98.91

An 1.3 16.7Ab 38.0 76.8Or 60.8 6.5

Notes: 1 1A~vgd.: 2 18Name: Sanidine Plag.

Mdl +/-

Std DevMvl +/-

Std Dev

75.7011.700.57

8-0.010.070.45

3. 8

4.838-0.02

3.401.70

0.16

0.040.180.63

1.41

67.60

13.900.27

8-0.03

0.490.653.515.11

B-0.01

10.90

5.10

0.20

0.440.33

1.271.86

to00l

96.90

3.551.145.4

2,512

See Notes

91.53

5.0

48.5

46.5

3 or 4,512

See Notes# Anal.

An, Ab. Or are molecular amounts of Ca, Na and K, calculated from the weight percents of CaO, Na2O and K20 and normalizedto 100X. An, Ab and Or are calculated for Matrix analyses ONLY for comparison with relative proportions of Ca, Na and Kin feldspars.


3 - Coarsely crystalline or "vapor phase" altered lithophysal matrix4 - Crystalline fiamme (light and dark areas differentiated)5 - Low totals due to porosity in areas analyzed


Standard deviations (calculated for matrix only) are n-l) weighted, and estimate sample errors at a 68Z confidence

YMP DMS Data Set ID: L04.A-08/01/84


Point IDs:

Element:

SiO2A1203

FeO*

MgOM&O

CaO

Na2O

K20BaO

Total:

F2,F4

65.8018.60

0.21B-0.00

B-0.000.40

4.95

9.65B-0.03

99.61

Fl Mdl-Md2 +/-Std Dev

63.6021.70

0.19

B-0.00B-0.00

3.47

8.89

1.26B-0.02

99.11

* 16.5

76.4

7.1

74.1010.80

0.90

0.080.150.45

3.154.44

B-0.01

6.702.50

1.49

0.18

0.190.240.75

2.04

I

An 1.9Ab 43.0Or 55.1

94.07

3.949.846.2

Notes:# Anal. Avgd.:

Name:

13

Sanidine

1

4

Flag.

2,525

See Notes

An, Ab, Or are molecular amounts of Ca. Na and K, calculated from the weight percents of CaO, Na2O and K20 and normalizedto 100%. An, Ab and Or are calculated for Matrix analyses ONLY for comparison with relative proportions of Ca, Na and Kin feldspars.

Notes: 1 - Feldspar Phenocrysts2 - Devitrified Shard Matrix3 - Coarsely crystalline or "vapor phase" altered lithophysal matrix.4 - Crystalline fiamme (light and dark areas differentiated)5 - Low totals due to porosity in areas analyzed.


Standard deviations (calculated for matrix only) are (n-i) weighted, and estimate sample errors at a 68% confidencelevel.



Point IDs:

Element:SiO2A1203FeO*MnO

M&O

CaO

Na2O

K20BaO

F4,F6

F8

67.0018.60

0.14

B-0.00B-0.00

0.30

4.929.61

0.10

Fl-F3

F5,F7

64.6022.10

0.17B-0.00B-0.00

3.739.011.13

B-0.03

Mdl-Md2 +/-Std Dev

Hvl +/-Std Dev

75.8012.40

0.60

0.06

0.120.39

3.475.40

B-0.01

4.302.500.26

0.04

0.10

0.220.81

1.70

84.506.51

0.29

B-0.03

0.280.29

1.71

2.27

B-0.00

13.107.370.39

0.430.371.91

2.75

Total: 100.67 100.74 98.24 95.85

An 1.5Ab 43.1

Or 55.4I-0.

17.476.3

6.3

114

Plag.

3.047.9

49.1

215

See Notes

4.850.844.4

3(?).5

10

See Notes

Notes:

# Anal. Avgd.:Name:

17

Sanidine

An, A Or are molecular amounts of Ca, Na and K, calculated from the weight percents of CaO, Na2O and K20 and normalizedto 100%. An. Ab and Or are calculated for Matrix analyses ONLY for comparison with relative proportions of Ca, Na and Kin feldspars.


3 - Coarsely crystalline or "vapor phase" altered lithophysal matrix.

4 - Crystalline fiazme (light and dark areas differentiated)

5 - Low totals due to porosity in areas analyzed.


Standard deviations (calculated for matrix only) are (n-l) weighted, and estimate sample errors at a 68% confidencelevel.

YMP DRS Data Set ID: L04.A-08/01/84

. ,.,

Bence-Albee Corrected Feldspar Phenocryst and Xenocryst Analyses of Sample: USW G-1 1245

Point ID: 1 2 3 5 6 7 8 9 10

Element:

Si02A1203FeO*MgO

CaONa20

K20BaO

66.8018.96

B-0.06

B-0.00

0.214.2510.90

B-0.12

64.0222.72B-0.09B-0.00

3.978.54

1.10

B-0.00

64.2422.78

B-0.09B-0.00

3.948.59

1.01

B-0.00

63.4722.91B-0.08

B-0.00

3.678.721.26

B-0.00

64.1922.84B-0.08B-0.00

3.768.89

1.08

B-0.00

66.31

19.22B-0.09

B-0.00

0.344.93

8.89

B-0.00

66.6119.10

B-0.05

B-0.00

0.214.14

10.30

B-0.01

62.6923.85

B-0.05

B-0.00

4.678.390.96

B-0.01

66.8119.27

B-0.06B-0.00

0.416.35

6.990.20

57.3727.57

B-0.04

B-0.008.436.670.36

B-0.00

Total: 101.12 100.35 100.56 100.03 100.76 99.69 100.36 100.56 100.03 100.40

ICD

An 1.0

Ab 36.8Or 62.2

Name: Sanidine

19.174.5

6.3

Plag.

19.0

75.15.8

Plag.

17.575.37.2

Plag.

17.876.1

6.1

1.745.053.3

1.1

37.561.4

22.272.3

5.4

2.056.841.2

40.357.72.0

Plag.Plag. Sanidine Sanidine Plag. Sanidine

An, Ab, Or are molecularto 100X.

amounts of Ca, Na and K calculated from the weight percents of CaO, Na2O and K20 and normalized

* All Fe is reported as FeO. Amounts shown as B-" are reported as analyzed, but are below detection limit and notincluded in totals.

YMP DRMS Data Set ID: 51/L04-4/19/90

Rence-Albee Corrected Feldspar Phenocryst and Xenocryst Analyses of Sample: USW G-1 1245 (Continued)

Point ID: 11 12

Element:SiO2 62.81 64.41A1203 22.33 22.54

FeO* B-0.07 Ba0.08

M&O B-0.00 B-0.00

CaO 3.30 3.48NaZO 8.87 8.97

K20 1.27 1.09

BaO B-0.00 B-0.00

Total: 98.58 100.49

An 15.8 16.6

Ab 76.9 77.3Or 7.2 6.2

Name: Plag. Plag.

An, Ab. Or are molecular amounts of Ca, Na and K, calculated from the weight percents of CaO. Na2O and K20 and normalized

to 100X.


included in totals.


.. 4

8ence-Albee Corrected Matrix and Glass Fragment Analyses of Sample: USW G-1 1245

Point ID:

Element:

SiO2

A1203FeO*

MgOCaO

Na2O

K20

MnOT102

D1

79.86

12.58

0.620.07

0.303.31

5.06

B-0.10B-0.06

D2

86.798.28

0.50B-0.04

0.11

1.90

3.80B-0.00B-0.00

D3

100.24

0.31

B-0.03

B-0.00B-0.00B-0.05

.04

B-0.00

B-0.00

D4

70.5216.69

B-0.06B-0.00

0.364.71

6.80

B-0.02

B-0.00

D5

81.8211.010.72

0.090.613.652.49

0.05

B-0.07

D6

75.9013.64

0.71

0.07

0.152.95

6.00B-0.01

B-0.08

D7

97.402.63

B-0.05

B-0.01

0.20

0.80

0.32B-0.00

B-0.10

D8

101.970.13

B-0.04

B-0.00

B-0.00B-0.00

B-0.01

B-0.00B-0.01

D9 D1O

80.7512.78

0.55B-0.02

0.18

3.24

5.80B-0.06

B-0.10

66.7918.570.32

B-0.00

B-0.053.87

9.89B-0.00B-0.00

Total: 101.80 101.38 100.55 99.08 100.44 99.42 101.35 102.10 103.30

I-

CD,

An 2.4Ab 48.6Or 48.9

1.442.6

56.0

2.150.247.7

6.064.929.1

* 1.242.3

56.6

1.4

45.3

53.3

99.44

0.0

37.362.7

Comment: Quartz- Quartz-Feldspar Feldspar

Tridymite? Repl. Repl.Cryst. Cryst.

FractureFill

MostlyQuartz

Quartz Repl. Repl.Cryst. Feldspar

An, Ab, Or are molecular amounts of Ca, Na and K, calculated from the weight percents of CaO, Na20 and K20 and normalized

to 100X. These are calculated ONLY for comparison with feldspar data, and are not calculated if silica phases aredominant.



Bence-Albee Corrected Matrix and Glass Fragment Analyses of Sample: USW G-1 1245 (Continued)

Point ID:

Element;

SiO2A1203

FeO*

H&O

CaONa2O

K20

HnO

IiO2

Dll D12 D13 D14 SH-1

102.740.19

8-0.02B-0.00B-0.00B-0.00B-0.01B-0.03B-0.06

101.440.92

B-0.04

B-0.00B-0.00

0.070.27

B-0.00B-0.00

73.6914.880.77

B-0.030.11

3.11

7.67B-0.01

B-0.06

88.228.33

B-0.05B-0.00B-0.06

1.91

3.91B-0.06B-0.01

77.8313.38

0.640.06

0.343.005.73

B-0.06B-0.08

SH-2

79.0312.54

0.800.060.173.01

5.93B-0.03B-0.07

SH-3

79.6512.74

0.56B-0.04

1.434.302.33

B-0.00B-0.05

SH-4

80.1412.650.44

B-0.02

0.153.01

5.99B-0.00

0.17

SH-5

79.2611.62

0.68B-0.04

0.663.96

2.71B-0.08

B-0.09

PU-1

79.5212.640.39

B-0.010.253.005.65

B-0.06B-0.00

Total: 102.93 102.70 100.23 102.37 100.98 101.54 101.01 102.55 98.89 101.45

I

AnAb

Or

0.737.8

61.4

0.0

42.657.4

2.743.1

54.2

1.343.055.7

11.964.9

23.1

1.242.8

56.0

Devit.Shard

6.064.8

29.2

2.043.8

54.2

Comment: Quartz Quartz Quartz- Quartz-Feldspar Feldspar

Devit. Devit. Devit.Shard Shard Shard

Devit. Devit.Shard Pumice

An, A. Or are molecular amounts of Ca, Na and , calculated from the weight percents of CaO, Na2O and K20 and normalizedto 100%. These are calculated ONLY for comparison with feldspar data, and are not calculated if silica phases aredominant.



Ia

Bence-Albee Corrected Opaque Oxide Analyses of Sample: USW G-1 1245

Point ID: 01

Element:SiO2 0.12TiO2 9.06

A1203 0.94V205 B-0.08

Cr303 8-0.00FeO* 81.30

MnO 0.26M&O B-0.01CaO B-0.01

Total: 91.68

Comment: Titano-Magnetite


included in totals.


U'

Bence-Albee Corrected Matrix Analyses of Sample: USW G-1 1315.2

Point U~s: G1-G2 t/-

Std DevElement:

SiO2 74.10 0.60A1203 11.70 0.10

FeO* 0.51 0.20MnO B-0.04M&O . 0.03 0.02

CaO 0.44 0.05NalO 3.27 U.17

K20 4.88 0.08BaO B-0.00

Total: 94.93

An 3.6

Ab 48.6Or 47.8

Notes: 1.2

I Anal. Avad.: 20Name: Glass

An, Ab, Or are molecular amounts of Ca, Na and K, calculated from the weight percents of CaO, Na2O and K20 and normalizedto 100X. An, A and Or are calculated for Matrix analyses ONLY for comparison with relative proportions of Ca, Na and K

in feldspars.

Notes: 1 - Glassy Shards in Vitrophyre2 - Low totals due to porosity in areas analyzed


included in totals.

Standard deviations are (n-i) weighted, and estimate sample errors at a 68% confidence level.


.

Bence-Albee Corrected Feldspar Phenocryst and Xenocryst Analyses of Sample: USW G-1 1594.8

Point ID:

Element:

SiO2A1203

FeO*MnOMgOCaO

Na2OK20

Total:

FPZ1

58.7325.900.13

8-0.00

B-0.007.277.140.59

FPZ2B

64.74

23.380.19

B-0.00

B-0.003.99

8.511.14

FPZ2C

65.95

22.130.17

B-0.00B-0.00

3.436.383.08

FPZ2D

62.6523.590.16

B-0.00

B-0.004.378.32

1.43

FPZ2E

63.1923.65

0.14

B-0.00B-0.00

4.428.56

1.04

FS1A

65.0219.120.10

B-0.01

B-0.000.233.97

10.01

98.45

FS1B

64.2419.250.11

B-0.01B-0.00

0.203.04

11.35

98.19

FS2A

64.5219.200.10

B-0.04

B-0.000.20

3.3910.59

98.00

FS2B

64.8218.91

0.10

B-0.00

B-0.000.19

3.3710.24

97.6399.76 101.95 101.14 100.52 101.00

An 34.8Ab 61.8Or 3.4I

CD

19.274.26.5

Plag.

2

18.4

61.919.7

Plas.

2

20.7

71.38.1

Plag.

2

20.9

73.25.9

Plag.2

1.237.261.7

1.0

28.670.3

1.1

32.466.6

1.0

33.066.0

Name:

Notes:Plag.

1Sanidine Sanidine

3 3Sanidine Sanidine

4 4


to 100%.

Notes: 1 - Optically unzoned phenocryst2 - Optically zoned (distinct core) but chemically unzoned

3 - Two parts of glomerocryst4 - Not notably zoned. FS3 and FS5 in lithic fragments.

* All Fe is reported as FeO. Amounts shown as *'B-" are reported as analyzed, but are below detection limit and not

included in totals.


Bence-Albee Corrected Feldspar Phenocryst and Xenocryst Analyses of Sample: USW G-1 1594.8 (Continued)

Point ID:

Element:

SiO2A1203

FeO*

MOMgOCaO

jNa2oK.20

FS3A

66.0119.47

0.13

B-0.00B-0.00

0.24

3.40

10.60

FS3B

66.20

19.450.10

B-0.04

B-0.000.233.3810.48

99.84

FS4 FS5

65.6719.29

0.10

B-0.00

B-0.000.243.54

10.59

99.43

66.5718.850.09

B-0.02

B-0.000.202.3311.18

99.22Total: 99.85

0

An 1.3

Ab 32.4Or 66.4

Name: Sanidine

Notes: 4

1.232.566.3

Sanidine

4

1.233.365.5

Sanidine

4

1.1

23.875.1

Sanidine

4


amounts of Ca, Na and K, calculated from the weight percents of CaO, Na2O and X20 and normalized

Notes: 1 - Optically unzoned phenocryst

2 - Optically zoned (distinct core) but chemically unzoned

3 - Two parts of glomerocryst

4 - Not notably zoned. FS3 and FS5 in lithic fragments.

* All Fe is reported as FeO. Amounts shown as *-B-" are reported as analyzed, but are below detection limit and not

included in totals.


.,

p

Bence-Albee Corrected Feldspar Phenocryst and Xenocryst Analyses of Sample: Al-1569

Point ID: 3

Element:SiO2

A1203FeO*

M&OCaO

Na2OK20BaO

Total:

66.3419.34

B-0.06B-0.02

0.18

5.827.98

B-0.07

99.66

56.78

27.390.11

B-0.00

8.606.370.48

B-0.06

66.8919.33

B-0.05

B-0.000.13

3.3110.250.12

99.73 100.03

0to

An 0.9Ab 52.1Or 47.0

Name: Sanidine

41.5

55.72.8

0.732.766.6

Plag. Sanidine

An, Ab, Or are molecularto 100%.

amounts of Ca, Na and , calculated from the weight percents of CaO, Na2O and K20 and normalized


included in totals.


Bence-Albee Corrected Matrix and Glass Fragment Analyses of Sample: Al-1569

Point ID:

Element:

SiO2A1203

FeO*

MgOCaO

Na2O

K20

MnO

TiO2

Total:

Gl

65.42

13.19

0.90

0.06

0.95

0.75

7.01

8-0.01

B-0.08

88.28

G2

69.05

10.86

0.83

B-0.03

1.48

0.75

5.20

B-0.07

B-0.08

88.17

G3

79.63

5.38

0.25

B-0.00

1.45

0.67

1.20

B-0.05

B-0.00

88.58

G4

72.74

9.10

0.68

B-0.02

1.04

0.58

4.00

B-0.04

B-0.05

88.14

G5

72.84

8.05

0.22

B-0.00

1.90

0.96

2.58

B-0.06

8-0.00

86.55

R1

55.5413.291.23

0.061.700.55

5.898-0.00B-0.05

78.26

R2 PU-3 xi X2

69.22

12.85

B-0.08

B-0.04

4.21

1.09

3.25

B-0.07

8-0.00

90.62

66.53

11.83

0.74

B-0.03

3.34

1.11

2.79

B-0.05

B-0.05

86.34

59.17

10.73

2.68

0.10

2.91

0.74

2.62

B-0.09

8-0.10

78.95

66.47

14.18

0.90

8-0.05

0.86

0.77

7.43

B-0.06

0.22

90.83

II-

I

An 8.9

Ab 12.7

Or 78.3

Comment: Zeolite &

Glass(?)

16.4

1S.068.6

35.4

29.6

34.9

15.2

15.3

69.5

28.3

25.9

45.8

17.5

10.3

72.2

41.9

19.6

38.5

38.5

23.2

38.3

39.5

18.2

42.3

7.7

12.6

79.7

Zeolite & Glass with Glass with Glass with ZeolitizedGlass(?) Zeolite Zeolite Zeolite Pumice

Devit. Zeolitized

Tuff Perlite

Zeolite Mostly

Feldspar

An, Ab, Or are molecular amounts of Ca, Na and K, calculated from the weight percents of CaO, NaZO and K20 and normalizedto 100%. These are calculated ONLY for comparison with feldspar data, and are not calculated if silica phases aredominant.



4 ,.-

., I

I

Bence-Albee

Point ID:

Element:

SiO2TiO2

A1203

V205

Cr303FeO*

MnO

MgC

CaO

Total:

Comment:

Corrected Opaque

01

Oxide Analyses of Sample: A-1569

02 03

1.98 0.45 0.6411.61 12.05 13.021.20 1.30 0.650.10 B-0.04 B-0.07

B-0.00 B-0.01 B-0.0074.88 78.30 77.01

P 0.50 0.37 1.600.09 0.04 0.050.10 B-0.02 B-0.00

90.46 92.51 92.97

Titano- Titano- Titano-Hagnetite Magnetite Magnetite

* All Fe is reported as FeO. Amounts shown as "B-" are reported as analyzed, but arebelow detection limit and not included in totals.


I

1-4I

Bence-Albee Corrected Feldspar Phenocryst and Xnocryst Analyses of Sample: USW G-1 1617.0-A

Point ID: FP1 FS2

Element:

Si02 64.47 66.08A1203 23.92 19.09FeO* 0.15 0.09HnO B-0.03 B-0.01M&O B-0.00 B-0.00CaO 4.07 0.22Na2O 8.40 3.44K20 1.77 10.77

Total: 102.78 99.69

An 19.0 1.1Ab 71.1 32.3'Or 9.9 66.6

Name: Plag. Sanidine

An, Ab, Or are molecular amounts of Ca, Na and K, calculated from the weight percents of CaO, Na2O and K20 and normalizedto 100%.



Bence-Albee Corrected Feldspar Phenocryst and Xenocryst Analyses of Sample: A1-2000

Point ID: 1 2 3 4 5 6 7 8 9 10

Element:

SiO2A1203FeO*

MaOCaONa2O

K20

BaO

66.3721.950.13

B-0.00

2.359.331.84

B-0.00

66.0322.220.18

B-0.00

2.529.211.71

B-0.04

66.2619.050.11

B-0.00

0.244.999.06

B-0.08

66.54

21.530.16

B-0.002.429.051.75

B-0.06

66.9319.070.12

B-0.00

0.245.149.18

B-0.13

66.5019.410.09

B-0.00

0.305.148.92

B-0.13

65.9919.430.14

B-0.00

0.35

5.139.06

0.27

66.9621.40

0.09B-0.00

2.349.14

1.80

B-0.00

58.4526.580.24

B-0.008.376.600.40

B-0.07

61.9324.92

0.17B-0.00

5.987.890.60

B-0.10

Total: 101.97 101.87 99.71 101.45 100.68 100.36 100.37 101.73 100.64 101.49

1�-4

W

I

An 11.0

Ab 78.8Or 10.2

Name: K-RichPlag.

11.978.5

9.6

K-RichPlag.

1.245.053.8

Sanidine

11.6

78.410.0

K-RichPlag.

1.245.453.4

1.546.0

52.5

1.745. 552.8

11.1

78.710.2

K-RichPlag.

40.357.4

2.3

Plag.

28.568.1

3.4

Plag.Sanidine Sanidine Sanidine

An, Ab. Or are molecularto 100%.

amounts of Ca, Na and K, calculated from the weight percents of CaO, Na20 and K20 and normalized


included in totals.


Bence-Albee Corrected Feldspar Phenocryst and Xenocryst Analyses of Sample: Al-Z000 (Continued)

Point ID:

Element:

SiO2

AlZO3

FeO*

MaO

CaO

Na2O

1iZO

BaO

12

55.49

27.56

0.28

B-0.00

8.99

6.37

0.35

B-0.00

13

65.80

21.87

0.15

B-0.00

2.34

9.38

1.84

B-0.03

14

60.56

25.90

B-0.06

B-0.00

7.03

7.35

0.53

B-0.05

15

66.06

22.16

0.09

B-0.00

2.86

9.22

1.45

B-0.00

16

66.40

19.34

0.11

B-0.00

0.29

4.92

9.02

0.25

18

65.96

19.44

0.13B-0.00

0.245.208.85

0.14

19

66.43

19.23

0.09

B-0.00

0.28

5.14

9.10

0.14

Total: 99.04 101.38 101.37 101.84 100.33 99.96 100.41

II.-

.t�-I

An 42.9

Ab 55.1

Or 2.0

Name: Plag.

10.978.9

10.2

K-Rich

Plag.

33.5

63.53.0

13.4

78.4

8.1

1.5

44.7

53.9

1.2

46.6

52.2

1.445.6

53.1

Flag. K-Rich

Plag.

Sanidine Sanidine Sanidine

An. Ab, Or are molecular

to 1001.

amounts of Ca, Na and K, calculated from the weight percents of CaO, Na20 and K20 and normalized

* All Fe is reported as FeO. Amounts shown as B-" are reported as analyzed, but. are below detection limit and not

included in totals.


'V


Point ID:

Element:SiO2

A1203

FeO*

MgO

CaO

Na2OK20

MnO

TiO2

Total:

D1

82.969.60

0.58B-0.00

0.37

3.572.49

B-0.00B-0.03

99.57

D2

83.708.94

0.81B-0.02

0.35

3.211.91

B-0.04

B-0.05

D3 Pu/Xl

87.158.06

0.65

B-0.000.24

3.011.85

B-0.06

B-0.06

52.1714.28

0.350.08

0.262.70

6.88B-0.05

B-0.00

76.72

X2

55.8814.85

1.30B-0.01

0.122.308.59

B-0.09B-0.05

83.04

X3

51.5113.99

0.11

0.11

0.212.247.68

B-0.00B-0.00

75.85

X4

59.1015.35

1.04B-0.00

0.092.49

9.50B-0.02

B-0.00

87.57

X5

51.36

13.661.94

0.07

0.192.81

6.29

B-0.00B-0.04

76.3298.92 100.96

'-A

I-

An 3.8Ab 66.0

Or 30.3

4.2

68.9

27.0

3.069.0

27.9

1.936.661.4

0.828.770.5

1.630.268.2

0.628.371.1

1.539.8

58.7

Comment: Devit. Devit. Devit. Devit. Devit. Devit. Devit. Devit.

Shards Shards Shards Pumice Pumice Pumice Pumice Pumice

An, Ab, Or are

to 1001.

molecular amounts of Ca, Na and , calculated from the weight percents of CaO, Na2O and 20 and normalized


included in totals.


Bence-Albee Corrected Feldspar henocryat and Xenocryst Analyses of Sample: A1-2389

Point ID: 1 2 3 4 5 6 7 8-1 8-2 8-3

Element:

SiO2

A1203FeO*

MHO

CaONa2O

K20

BaO

65.9022.380.12

B-0.00

3.506.59

1.32

B-0.12

64.52

22.25

0.13B-0.00

3.349.14

1.34

B-0.00

61.0624.34

0.10

B-0.006.217.74

0.58B-0.06

65.8521.610.14

B-0.00.2.80

8.851.36

B-0.13

59.2125.010.11

B-0.007.047.52

0.54B-0.04

64.3722.130.17

B-0.003.169.07

1.19B-0.04

65.6819.14

B-0.05B-0.00

0.204.24

10.45

0.45

63.40

21.900.16

B-0.003.19

8.961.27

B-0.01

63.3922.48

0.09

B-0.003.579.14

1.20

B-0.09

64.7122.32

0.11

B-0.003.508.971.20

B-0.02

Total: 99.81 100.72 100.03 100.61 99.43 100.09 100.16 98.88 99.87 100.81

An 20.6Ab 70.2Or 9.2

I-

15.6

77.0

l .4

Plag .

29.767.0

3.3

Plag.

13.778.4

7.9

Plag.

33.163.9

3.0

Plag.

15.178.2

6.8

1.0

37.861.2

15.377.5

7.2

Plag.

Zoned

16.6

76.86.6

Plag.

Zoned

76.7

6.8

Plag.

ZonedName: Plag. Plag. Sanidine

An, Ab. Or are molecular amounts of Ca,to 100X.

Na and K, calculated from the weight percents of CaO, a20 and K20 and normalized

* All Fe is reported as FeO. Amounts shown as B-" are reported as analyzed, but are below detection limit and not

included in totals.


Bence-Albee Corrected Feldspar Phenocryst and Xenocryst Analyses of Sample: A1-2389 (Continued)

Point ID:

Element:

SiO2A1203

FeO*

MgOCaO

Na2O

K20BaO

9

64.2019.17

0.08

B-0.010.214.35

10.01

0.50

10

64.33

21.97

B-0.07B-0.00

2.95

9.251.40

B-0.08

99.90

11

63.84

18.860.10

B-0.00

0.254.25

10.200.67

98.17

12

62.74

22.360.17

B-0.00

3.658.94

1.08

B-0.08

98.94

13

62.8322.86

0.18B-0.00

4.398.57

0.83

B-0.12

99.66

14

63.04

22.79

0.18

B-0.00

3.908.69

1.02B-0.00

99.62

15

63.96

22.22

0.08

B-0.003.468.97

1.28

B-0.11

16

63.8422.81

0.11B-0.01

4.048.90

1.12B-0.00

20

62.48

22.350.17

B-0.00

3.478.94

1.07

0.15

21 22

63.96

22.220.09

B-0.00

3.409.34

1.23B-0.09

64.55

22.13

0.09

B-0.00

3.389.251.26

B-0.00

Total: 98.02 99.97 100.82 98.63 100.24 100.66

An 1.0Ab 39.4Or 59.6

-13.8

78.4,

7.8

1.238.360.5

17.3

76.66.1

Plag.

21.074.24.7

plas.

18.7

75.55.8

Plag.

16.3

76.57.2

Plag.

18.8

75.06.2

Plag.

16.677.36.1

Plag.

15.6

77.76.7

15.677.46.9

I

�-A

-4

I

Name: Sanidine Plag. Sanidine Plag. Plas.

An, Ab, Or are

to 1002.

molecular amounts of Ca, Na and , calculated from the weight percents of CaO, Na20 and K20 and normalized

* All Fe is reported as FeO. Amounts shown as "8-" are reported as analyzed, but are below detection limit and notincluded in totals.


Bence-Albee Corrected Feldspar Phenocryst and Xenocryst Analyses of Sample: Al-2389 (Continued)

Point ID: 23 24 25 26

Element:SiO2 65.23 65.36 62.86 63.96A1203 19.11 19.18 22.28 22.11FeO* B-0.08 B-0.07 0.15 0.13M&O B-0.00 B-0.00 B-0.00 B-0.00CaO 0.23 0.25 3.43 3.19

Na2O 4.36 4.51 9.16 9.03K20 10.12 10.17 1.27 1.32BaO 0.96 0.46 B-0.13 B-0.02

Total: 100.01 99.93 99.15 99.74

An 1.1 1.2 15.9 15.1Ab 39.1 39.8 77.0 77.4Or 59.7 59.0 7.0 7.4

0o Name: Sanidine Sanidine Plag. Plag.

An, Ab. Or are molecular amounts of Ca, Na and K, calculated from the weight percents of CaO. Na2O and K20 and normalizedto 1002.



~~~~~~~~~~~ , >~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~N

Bence-Albee Corrected Matrix and Glass Fragment Analyses of Sample: A2389

Point ID:

Element:

SiO2A1203

FeO*M&OCaO

Na2O

S20MnO

TiO2

G1

50.1013.59

0.12B-0.03

0.142.087.72

B-0.01B-0.00

G2

89.087.46

B-0.09B-0.00

0.22

2.522.42

B-0.00B-0.02

G3

82.559.170.32

B-0.000.202.38

3.98B-0.00B-0.00

Dl

99.840.51

B-0.02B-0.03B-0.02

0.120.14

B-0.00B-0.00

D2

99.521.41

B-0.00B-0.00B-0.000.28

0.81B-0.00B-0.04

D3 PUl

58.9714.40

B-0.08B-0.00

0.615.423.35

B-0.02B-0.08

98.992.08

B-0.04B-0.00B-0.000.32

1.08B-0.01B-0.00

R1

59.2816.41

0.16B-0.03

0.744.715.91

B-0.03B-0.02

R2 R3

87.966.690.13

B-0.030.201.77

3.050.21

B-0.10

65.6620.950.17

B-0.002.658.601.56

B-0.00B-0.00

Total: 73.75 101.70 98.60 100.61 102.02 82.75 102.47 87.21 100.01 99.59

1

I

An 1.1Ab 28.7Or 70.2

2.959.537.6

2.246.6

51.3

4.268.127.7

0:0

31.069.0

4.552.343.2

2.845.5

51.6

13.277.5

9.3

Comment: Devit. Devit. Devit. Devit. Devit.Matrix Matrix Matrix Tridymite? Tridymite?

Devit. Devit. Devit. Devit. Devit.Matrix Silica Matrix Matrix Matrix

An, Ab, Or are molecular amounts of Ca, Na and K, calculated from the weight percents of CaO, Na2O and K20 and normalizedto 100%. These are calculated ONLY for comparison with feldspar data, and are not calculated if silica phases aredominant.



Bence-Albee Corrected Opaque Oxide Analyses of Sample: A-2389

Point ID: 02 03

Element:Sio2 0.08 0.31iO2 15.46 10.78

A1203 0.61 1.02V205 B-0.00 0.18

Cr303 B-0.10 B-0.06FeO* 79.50 79.28MJ-.O 0.67 0.63Mao B-0.01 B-0.00CaO 0.05 B-0.04

Total: 96.37 92.20

Comment: Titano- Titano-Magnetite Magnetite

* All Fe is reported as FeO. Amounts shown as B-" are reported as analyzed, but arebelow detection limit and not included in totals.


Va -


Point ID: 1 2 3 4 5 6 8 10 11

Element:

SiO2

A1203FeO*M8OCaONa2O

K20

BaO

66.6018.720.12

B-0.00

0.234.229.85

0.69

64.3819.24

B-0.07B-0.00

0.224.20

10.11

0.53

98.68

64.5518.93

0.13

B-0.000.264.25

9.37

0.61

63.89

22.46

0.08

B-0.003.57

9.311.30

B-0.09

64.8418.65

0.12B-0.00

0.264.16

10.14

0.76

98.93

65.08

18.610.11

B-0.000.164.179.83

0.46

98.42

63.28

22.420.10

B-0.00

3.649.101.21

B-0.04

99.75

66.0218.56

0.11B-0.00

0.244.16

10.170.58

99.84

66.31

18.520.11

B-0.000.21

4.1610.20

0.35

66.1421.77

0.17B-0.00

3.22

9.12

1.08B-0.03

Total: 100.43 98.10 100.61 99.86 101.50

An 1.2Ab 39.0Or 59.9

Name: Sanidine

1.1

38.360.6

1.440.358.4

16.3 1.376.7 37.97.0 60.8

0.8

38.960.3

16.9

76.46.7

1.2

37.960.9

1.1

37.9

61.1

15.378.66.1

Plag.I-A

Sanidine Sanidine Plag. Sanidine Sanidine Plag. Sanidine Sanidine


amounts o Ca, Na and , calculated from the weight percents of CaO, Na2O and K20 and normalized



Bence-Albee Corrected Feldspar Phenocryst and Xenocryst Analyses of Sample: A1-2429 (Continued)

Point ID:

Element:

SiO2A1203FeO*

MaOCaO

Na2OK20BaO

12

63.27

22.92

0.18

B-0.00

4.28

8.39

0.88

B-0.12

13

65.59

21.820.19

B-0.003.098.871.29

B-0.06

15

64.68

18.79

0.12

B-0.00

0.21

4.12

9.97

0.62

16

65.3422.29

0.19

B-0.003.958.721.03

B-0.06

17

64.51

22.31

0.10

B-0.00

3.29

9.37

1.3

B-0.03

Total: 99.92 100.85 98.51 101.52 100.96

IP-t"Dt1aI

An 20.9

Ao 74.0

Or 5.1

Name: Plag.

An, Ab. Or are

to 1001.

14.9

77.6

7.4

1.1

38.2

60.8

18.8

75.3

5.9

Plag.

15.0

77.5

7.5

Plag.Plag. Sanidine

molecular amounts of Ca, Na and K, calculated from the weight percents of CaO, Na2O and K20 and normalized

* All Fe is reported as FeO. Amounts shown as "B-" are reported as analyzed, but, are below detection limit and not

included in totals.


.. V.


Point ID:

Element:

SiO2A1203

FeO*MgO

C6ONaZO

K20

MnOTiO2

Total:

Gi

95.40

2.83B-0.07B-0.00

B-0.060.770.75

B-0.05

B-0.03

99.75

G2

61.0016.74

0.12B-0.00

0.583.487.88

B-0.07

B-0.02

89.80

3.638.7

57.7

G3

64.1615.84

0.23

B-0.01

0.322.54

9.11

B-0.01B-0.05

92.20

2.029.268.8

Dl

63.4918.68

0.12B-0.04

0.886.544.55

B-0.00

B-0.00

94.26

4.965.329.9

D2

65.6118.94

0.28

0.09

0.192.46

10.86B-0.04

B-0.00

RI

100.570.350.70

0.15

B-0.010.110.17

B-0.04

B-0.05

R2

64.26

20.610.39

0.21

1.907.132.89

B-0.00

B-0.00

97.3998.43 102.05

c.A

AnAbOr

1.1

25.373.6

10.470.718.9

Comment: Silica Sanidine Sanidine Rock Frag. Rock Frag. Rock Frag. Rock Frag.Dominant Dominant Dominant Na-K Feldsp. Sanidine Quartz Na-K Feldsp.


to 100%. These are calculated ONLY for comparison with feldspar data, and are not calculated if silica phases are

dominant.


included in totals.



Point ID: 01 02

Element:SiOZ 0.11 0.14TiO2 10.90 10.51

A1203 0.60 0.56

V205 0.10 0.13

Cr303 B-0.01 B-0.00

FeO* 79.68 79.29

MnO 1.12 1.04

M&O 0.18 0.06

CaO 0.05 B-0.03

Total: 92.74 91.73

Comment: Titano- Titano-Magnetite Hignet~lte

* All Fe is reported as FeO. Amounts shovni as "B-" are reported as analyzed, but are

below detection limit and not included in totals.

YMP RMS Data Set ID: 51/L04-4/19/90

w


Point ID: 2 3 4 5P 6 8

Element:SiO2

A1203FeO*

MgO

CaONa2O

K20BaO

65.7819.270.12

B-0.00

0.244.25

10.57B-0.12

65.3319.160.11

B-0.00

0.244.25

10.24

0.34

65.5422.390.15

B-0.00

3.308.85

1.26B-0.05

63.26

22.60.09

B-0.00

3.639.041.16

B-0.00

64.8323.020.17

B-0.00

3.588.921.08

B-0.08

66.95

19.50

0.12B-0.00

0.224.09

10.32

0.42

9

64.13

23.30

0.19B-0.00

3.778.83

1.12B-0.04

11

66.5919.360.11

B-0.000.174.27

10.470.27

12 13

64.7019.230.10

B-0.000.214.29

10.080.23

98.84

65.1919.370.13

B-0.00

0.234.229.610.74

99.49Total: 100.23 99.67 101.49 99.78 101.60 101.62 101.34 101.24

An 1.2Ab 37.5Or 61.3

1.238.260.6I

U'-

15.976.9

7.2

Plag.

17.076.5

6.5

Pla .

17.076.8

6.1

1.137.261.7

17.975.8

6.3

0.837.961.2

1.138.960.1

1.239.559.3

Name: Sanidine Sanidine Plag. Sanidine Plag. Sanidine Sanidine Sanidine

An. Ab, Or are molecularto 1002.

amounts of Ca. Na and K. calculated from the weight percents of CaO. Na2O and K20 and normalized

* All Fe is reported as FeO. Amounts shown as "B-" are reported as analyzed,included in totals.

but are below detection limit and not


Bence-Albee Corrected Feldspar Phenocryst and Xenocryst Analyses of Sample: A-2499 (Continued)

Point ID: 14P 15 16

Element:Si02 64.36 63.40 66.13

Al203 22.32 22.76 22.43FeO* 0.08 0.16 0.16

M&O B-0.00 B-0.00 B-0.00

CaO 3.40 3.57 2.74Na20 9.20 8.92 8.97

K20 1.1o 1.10 1.41

BaO B-0.00 B-0.04 B-0.06

Total: 100.54 99.91 101.84

An 15.8 17.0 13.3Ab 77.6 76.8 78.6Or 6.5 6.2 8.1

Name: Plag. Plag. Flag.

An, Ab, Or are molecular amounts of Ca, Na and K, calculated from the weight percents of CaO, Na2D and K20 and normalizedto 00g.



.*


Point ID:

Element:

SiO2A1203

FeO*

MgOCaONa2O

K20

MnO

TiO2

(D&G)1 (D&G)2 (D&G)3 (D&G)4

100.680.29

B-0.03

B-0.00B-0.00B-0.06

0.05B-0.00

B-0.01

46.7618.190.200.510.481.185.63

B-0.00B-0.00

99.371.68

B-0.05

0.120.12

B-0.050.12

B-0.00B-0.00

90.894.37

B-0.04B-0.03

0.180.911.24

B-0.03

B-0.00

D5

95.774.19

B-0.06

B-0.00

0.080.43

1.62B-0.04

B-0.00

D6

91.874.16

B-0.03

B-0.00

B-0.000.72

3.31B-0.00

B-0.05

D7

83.457.38

B-0.02

B-0.000.14

1.62

3.29B-0.00

B-0.01

Total: 101.02

AnAb

Or

72.95 101.41 97.59 102.09 100.06

-.

to3

5.222.971.9

5.449.9

44.7

2.927.9

69.2

0.0

24.8

75.2

95.88

2.041.9

56.1

Comment: Quartz & Feldspar Quartz &Tridymite? Porous Tridymite?

Quartz + Quartz + Quartz +Feldspar Feldspar K-Feldspar

Quartz +Feldspar



dominant.


included in totals.



Point ID: 01 02 03 04

Element:SiO2 0.22 0.13 0.14 0.35TiO2 7.05 42.14 8.98 11.80A1203 0.43 0.33 0.72 1.45V205 B-0.07 0.14 B-0.00 B-0.07Cr303 B-0.00 B-0.01 B-0.00 B-0.01FeOC 78.50 59.51 83.35 71.62MnO 3.48 2.89 2.11 4.26M&O 0.14 0.09 0.12 0.32CaO B-0.02 B-0.02 B-0.03 B-0.03

Total: 89.82 105.23 95.42 89.80

Comment: Titano- Ilmenite Titano- Titano-Magnetite Magnetite Magnetite

(Note: All analyses show relatively high MnO content.)

* All Fe is reported as FeO. Amounts shown as "B-" are reported as analyzed, but arebelow detection limit and not included in totals.

YMP DMS Data Set ID: 51/L04-4/19/90

.0

.

.j


Point ID:

Element:

SiO2A1203

FeO*

MaoCaONa2OK20

BaO

1S

65.51

19.12

B-0.07

B-0.00

0.20

3.62

11.29

B-0.13

2S SP

64.12

18.98

B-0.05

B-0.00

0.19

3.70

10.98

0.33

63.19

23.28

0.12

B-0.00

4.46

8.48

1.13

B-0.00

63.17

23.02

0.11

B-0.00

4.59

8. 61

0.94

B-0.02

6P

62.22

23.32

0.10

B-0.01

4.63

8.74

0.90

B-0.00

7S

64.46

19.35B-0.08

B-0.00

0.313.74

10.80

0.55

8S 9P-Z1 1oF-Z2 lip-Zi

66.49

18.91

B-0.06

B-0.00

0.18

3.61

11.45

B-0.15

57.14

26.38

0.15

B-0.00

8.30

6.77

0.51

B-0.14

63.7223.45

0.11B-0.00

4.80

8.53

1.04B-0.04

62.98

23.26

0.12

B-0.00

4 .44

8.55

1.06

B-0.00

Total: 99.74 98.30 100.66 100.44 99.91 99.21 100.64 99.25 101.65 100.41

An 1.0

Ab 32.4

Or 66.6

1.0

33.5

65.5

21.1

72.6

6.4

21.6

73.2

5.3

21.573.5

5.0

1.6

33.964.5

0.9

32.167.0

39.2

57.9

2.9

22.4

71.9

5.8

21.073.1

6.0

Name: Sanidine Sanidine Plag. Plag. Pla. Sanidine Sanidine Plas.Zoned Core

Plas. Plag.Zoned Rim Zoned Core

An, Ab, Or are

to 100X.

molecular amounts of Ca, Na and K, calculated from the weight percents of CaO, Na2O and KZO and normalized


included in totals.



Point ID: 11P-Z2 13P-Z1 14P-Z2 15P-Z1 16P-Z2 18P-Z1 19P-Z2 20P-Z1 21P-Z2

Element:

SiO2

A1203

FeO*

M&O

CaO

Na2O

K20

BaO

63.38

22.57

0.09

B-0.00

4.06

9.06

1.08

B-0.00

61.26

23.69

0.13

B-0.00

5.47

8.17

0.84

B-0.05

64.07

22.97

0.11B-0.00

4.21

8.70

1.18

B-0.01

60.97

23.76

0.12

B-0.01

5.51

8.20

0.81

B-0.08

58.80

25.25

0.09

8-0.00

7.13

7.36

0.61

B-0.10

59.73

24.64

0.13

B-0.00

6.18

7.88

0.74

B-0.11

62.20

22.67

0.11

B-0.00

4.07

8.78

1.13

B-0.01

63.30

23.01

0.10

B-0.00

4.29

9.14

0.77

B-0.05

57.8026.22

0.11

B-0.00

8.09

7.05

0.51

B-0.13

Total: 100.24 99.56 101.24 99.37 99.24 99.30 98.96 100.61 99.78

An 18.7

Ab 75.4

Or 5.9

25.7

69.6

4.7

19.7

73.7

6.6

25.9

69.6

4.5

33.7

62.9

3.4

29.0

66.9

4.1

19.1

74.6

6.3

19.7

76.1

4.2

37.7

59.5

2.8

Name: Plag. Plag.

Zoned Rim Zoned Core

Plag. Plag.


Plag. Plag.


Plag. Plag.


Plag.

Zoned Rim

An, Ab. Or are molecular

to 100%.

amounts of Ca. Na and K, calculated from the weight percents of CaO, Na2O and K20 and normalized



14 ...t

Bence-Albee Corrected Matrix and Glass Fragment Analyses of Sample: USW G1 2928.6

Point ID:

Element:

SiO2A1203FeO*

M&O

CaONa2O

K20MnO

TiO2

(D&G)1 (D&G)2 (D&G)3 Pu/X-l Pu/X-2

91.845.71

B-0.03

B-0.00

B-0.060.90

2.96B-0.07B-0.00

79.31

11.710.21

0.01

0.12

2.01

6.95B-0.04B-0.05

79.8011.72

0.18B-0.01

0.833.852.99

B-0.09

B-0.08

51.73

15.00

0.190.130.47

3.205.84

B-0.02

B-0.02

80.19

13.65

0.30B-0.00

1.034.303.34

B-0.05B-0.05

X4

54.19

15.00

0.250.090.24

2.06

7.80

B-0.03B-0.01

X5

64.6417.48

0.17B-0.02

B-0.001.92

11.93

B-0.00B-0.00

X6

101.181.07

B-0.05B-0.02

B-0.010.13

0.53

B-0.00B-0.00

Total: 101.41 100.32

I6

An 0.0Ab 31.6

Or 68.4

1.0

30.268.8

99.37

7.361.3

31.3

3.643.8

52.6

8.160.8

31.1

76.56 102.81 79.63

1.828.1

70.1

96.14 102.91

0.0

19.780.3

Devit. QuartzFeldspar Dominant

Comment: Devit. Qtz Devit. Qtz Devit. Qtz Qtz-FeldspFeldspar Feldspar Feldspar (Porous)

Quartz Qtz-FeldspFeldspar (Porous)

An, Ab. Or are molecular amounts of Ca, Na and K. calculated from the weight percents of CaO, Na2O and K20 and normalized


dominant.

* All Fe is reported as FeO. Amounts shown as B-" are reported as analyzed, but are below detection limit and not

included in totals.


Bence-Albee Corrected Opaque Oxide Analyses of Sample: USW G-l 2928.6

Point ID: 01

Element:SiO2 0.49TiO2 8.98

A1203 0.96V205 0.10

Cr3O3 B-0.00FeO* 82.20

M&O 0.05CaO 0.08

Total: 95.06

Comment: Titano-Manetite

* All Fe is reported as FeO. Amounts shown as "-" are reported as analyzed, but arebelow detection limit and not included in totals.


.9 .9

v *

I


Point ID: 1 2-Z1

Element:

SiO2A1203

FeO^

M&OCaONa2O

K20BaO

66.0919.17

B-0.06

B-0.000.143.5611.43

0.27

57.0327.720.17

B-0.008.81

6.010.47

B-0.00

3-Z2

58.9326.420.14

B-0.007.746.590.65

B-0.03

4-Z3

59.3026.03

0.15B-0.00

7.406.710.72

B-0.03

- 5

65.6419.25

B-0.05B-0.00

0.19

3.4910.34

0.26

65.96

19.06B-0.05

B-0.00

0.18

3.4810.17

0.21

65.9318.97

0.06B-0.00

0.143.76

10.710.20

63.34

23.18

B-0.08

B-0.003.808.771.23

B-0.00

8-Z1 9-Z2

59.3726.36

0.16

B-0.007.366.960.45

B-0.06

10-Z3

63.5322.72

0.12B-0.00

3.60

8.521.11

B-0.01

Total: 100.66 100.21 100.47 100.31 99.17 99.06 99.77 100.32 100.66 99.60

c

An 0.7Ab 31.9Or 67.4

Name: Sanidine

43.553.7

2.8

37.958.33.8

36.3

59.54.2

Plag.

Rim

1.0

33.665.4

Sanidine

1.0

33.965.2

0.734.564.7

18.0

75.16.9

35.961.5

2.6

17.7

75.86.5

Plag.

Rim

Plag. Plag.Core Intermed.

Sanidine Sanidine Plag. Plag.Core Intermed.

An, A Or are molecular

to 1001.

amounts of Ca, Na and K, calculated from the weight percents of CaO, Na2O and K20 and normalized


YMP DRMS Dats Set ID: 51/L04-4/19/90


Point ID: 11 12 13 15 16 17 20 22-Zl 23-Z2 24-Zl 25-Z2

Element:SiO2A1203

FeO*

MgO

CaONa2O

K20BaO

61.89

23.09

0.10

B-0.00

3.69

6.54

1.19

B-0.03

60.62

23.96

B-0.07

B-0.00

4.76

8.25

0.77

B-0.00

65.33

18.92

B-0.05

B-0.00

0. 13

3.39

10.91

0.87

63.84

23.23

0.11

B-0.00

4.03

8.36

1.04

B-0.10

66.45

19.01

B-0.06

B-0.00

0.14

3.52

11. 8

B-0.10

65.82

19.01

B-0.07

B-0.00

0.13

3.55

11.94

B-0.05

66.19

19.23

B-0.07

B-0.00

0.19

3.58

10.88

0.12

64.07

23.28

0.09

B-0.00

3.97

8.67

0.70

B-0.04

60.6025.14

0.10B-0.00

6.227.35

0.61

B-0.09

59.19

26.22

0.11

B-0.00

6.87

6.94

0.56

B-0.04

63.47

23.40

B-0.08

B-0.00

4.09

8.36

0.98

B-0.00

Total: 98.50 98.36 99.55 100.61 101.00 100.45 100.19 100.78 100.02 99.89 100.30

An 17.9

Ab 75.2

Or 6.9

23. 1

72.5

4.4

0.7

31.9

67.5

19.8

74.2

6.1

0.7

30.8

68.5

0.6

30.9

68.4

1.0

33.0

66.0

19.4

76.6

4.1

30.7

65.7

3.6

34.2

62.5

3.3

20.1

74.2

5.7

Name: Flag. Plag. Sanidine Plag. Sanidine Sanidine Sanidine Plag.

Core

Flag.

Rim

Plag.

Core

Plag.Rim

An, Ab, Or are molecular

to 100Z.

amounts of Ca, Na and , calculated from the weight percents of CaO. Na20 and K20 and normalized

* All Fe is reported as FeO. Amounts shown as "B-" are reported as analyzed, but are

included in totals.below detection limit and not


%) so. ,, 1.

*U I

.1


Point ID: 26-Zl 27-Z2 29-Zl 30-Z2 33-ZI 34-Z2

Element:

SiOz 60.03A1203 25.36

FeO* 0.09

MSO B-0.00CaO 5.99Na2O 7.53K20 0.58BaO B-0.00

Total: 99.58

An 29.5Ab 67.1Or 3.4

Name: Plag.

Core

An, Ab, Or are

to 100%.

62.6123.41

B-0.07

B-0.00

3.938.24

1.08B-0.08

99.27

19.574.16.4

Plag.

Rim

molecular

55.94

28.38B-0.05

B-0.009.44

5.650.46

B-0.01

99.87

46.7

50.62.7

Plag.

Core

amounts of Ca,

62.65

22.86

B-0.08B-0.00

3.568.75

1.27

B-0.00

99.09

17.075.77.2

Plag.

Rim

Na and K.

63.40

23.310.11

B-0.00

3.928.570.78

B-0.00

100.09

19.3

76.24.6

Plag.

Core

calculated

60.1225.07

0.11B-0.00

5.817.510.82

0.23

99.67

28.566.7

4.e

Plag.

Rim

from the weight percents of CaO, Na2O and K20 and normalized

I-

U'



Bence-Albee Corrected Matrix and Glass Fragment Analyses of Sample: USW G-1 2939.3

Point ID: (G&D)l (G&D)2 (G&D)3

Element:

SiO2A1203FeO*

M&OCaO

Na2O

YnO

TiO2

82.4010.49

1.490.09

0.653.962.2S.

0.040.17

85. 98.790.240.020.693.430.00

B-0.00B-0.00

85.1610.210.93

0.150.82

4.131.2u

B-0.09B-0.10

D4

93.126.19

0.14B-0.02

0.362.19

1.26

B-0.03B-0.00

D5

86.339.20

0.21B-0.05

0.783.78

1.17B-0.03

B-0.00

Xl

45.48

13.090.440.11

0.221.537.18

B-0.00

B-0.00

68.05

1.924.0

74.1

X2

56.8315.650.43

0.14

0.182.22

9.67B-0.00

B-0.01

85.12

1.125.6

73.3

X3

51.2914.19

0.620.23

0.32

1.501.17

B-0.01B-0.06

75.32

2.823.573.8

Total: 101.57 100.24 102.60 103.26 101.47

IP_W

I

An 6.2Ab 68.0Or 25.8

8.374.816.9

8.4

76.914.7

6.268.1

25.8

8.775.915.5

Comment: Quartz & Quartz & Quartz &Feldspar Feldspar Feldspar

Devit. Devit. Porous Porous PorousShard Shard Clay-rich? Clay-rich? Clay-rich?

An, Ab, Or are molecular amounts of Ca, Na and K, calculated from the weight percents of CaO, Na2O and K20 and normalizedto 100%. These are calculated ONLY fordominant.

comparison with feldspar data, and are not calculated if silica phases are


YMP DRMJS Data Set ID: 51/L04-4/19/90

, ,*.

.4.9

Bence-Albee Corrected Opaque Oxide Analyses of Sample: USW G-1 2939.3

.

Point ID:

Element:

Si02Ti02

A1203V205

Cr303

FeO*

M&O

CaO

Total:

01

0.518.73

0.930.18

0.10

82.062.16

0.13

0.08

94.88

02

0.so

0.28

0.79

B-0.06B-0.06

85.252.70

0.08

0.17

89.77

I-

Comment: Titano- Hematite

Magnetite in Lithic

* All Fe is reported as FeO. Amounts shown as "B-" are reported as analyzed, but are

below detection limit and not included in totals.

YMP DRHS Data Set ID: 51/L04-4/19/90

APPENDIX E

APPLICABILITY TO REFERENCE INFORMATION BASE

AND SITE AND ENGINEERING PROPERTIES DATA BASE

All data presented on the data compilation forms in Appendix B

are intended for entry in the Site and Engineering Properties

Data Base (SEPDB).

-138-

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Documents

SAND91-7031, 'Mineralogy, Petrology and Whole-Rock ... · studies, electron microprobe analysis and scanning electron microscopy. The sections used in the work presented here were