UNITED STATES DEPARTMENT OF THE INTERIOR

GEOLOGICAL SURVEY

SPECTROGRAPHIC AND ATOMIC-ABSORPTION ANALYSES OF

GEOCHEMICAL SAMPLES FROM THE

MEDFRA QUADRANGLE, ALASKA

BY

H. D. King, E. F. Cooley, R. M. OILeary,

R. 6. Tr-lpp, S. K. McDanal, and D. L. Spiesman, Jr.

Open-Fi 1 e Report 79-959

1979

A geochemical survey was begun in the Medfra quadrangle, Alaska I

during 1978 as part of the Alaska Mineral Resource Assessment Program

(AMRAP). This report presents analytical data for samples collected

during the summer o f 1978 (tables 1 and 2). Sample s i t e locations are I I

shown on plate 1.

Stream-sediment samples were collected at 305 sites, and

heavy-mineral concentrate samples were collected at 246 o f the same sites.

Access to sample sites was gained by use of a helicopter.

Most of the samples were taken from active stream channels.

Minus-2-mm sediment was col 1 ected for the stream-sediment samples . This material was air-dried and sieved in the laboratory with an 80-mesh

(0.177 mm) screen; the minus-80-mesh fraction was pulverized and analyzed.

Heavy-mineral concentrate samples were collected by panning t he minus-2-mm

stream sediment to remove most o f the light-mineral fraction. The

remaining 1 ight-mineral grains were removed in the laboratory by passing

the samples through bromoform (specific gravity , 2.86). The

heavy-mineral concentrate sampl es were divided into three fractions based

on magnetic susceptibilities of the mineral grains. A fraction consisting

chiefly of magnetite was removed with the use of a hand magnet and a

Frantzl Tsodynamic magnetic separator at a setting of 0.1 ampere. Two

-- -

I ~ h e use o f this trade name is for descriptive purposes only and

does not constitute endorsement o f this product by the U.S. Geological

Survey.

additional fractions were obtained by passing the remaining sample

through the Frantz separator at a setting of 0.6 ampere. The fraction

w i t h the least magnetic susceptibility, referred to in this report as

nonmagnetic, generally contains most of the minerals of interest in

geochemical exploration. A split of this fraction was pulverized with

mortar and pestle and used for analysis. The remaining split was saved

for mineralogical examination.

Stream-sediment samples and nonmagnetic heavy-mineral concentrate

samples were analyzed for 31 elements by semi quanti tative emission

spectrography (Grimes and Marranzino, 1968). Iron, magnesium, calcium,

and titanium are reported in percent; all other analyses are reported in

parts per million. The values were reported as geometric midpoints,

1 .O, 0.7. 0.5, 0.3, 0.2, 0.15, and so on, of geometric brackets having

the boundaries 1.2, 0.83, 0.56, 0.38, 0.26, 0.18, 0.12, and so on,

Stream-sediment samples were also analyzed for gold, mercury, and

zinc using atomic-absorpti on spectrometry (methods described by Ward and

others, 1969).

Spectrographic analyses were done by E. F. Cooley. Atomic-absorption

analyses were done by R. M. OILeary, G. Y. Ito, and A . L. Gruzensky.

Sample site numbers, as shown on the map, may be obtained from

sample numbers shown in the tables by removing the prefix "M", leading

zeros, and suffixes "5" or "C3". For example, the site where sample

number MOOlS was collected i s indicated by a dot on the map next to the

number 1.

Symbols used in the tables are as follows: , an undetermined

value greater than the value shown was detected. The symbols "S" and "AA"

i n the element column headings preceding the element symbols indicate the

method of analysis as follows: S, spectrographic analysis; AA, atomic-

absorption analysis.

All of the analytical data have been entered in the U.S. Geological

Survey's computerized analysis storage system (RASS) .

REFERENCES CITED

Grimes, D. J., and Marranzino, A. P. , 1968, Direct-current arc and

alternating-current spark emission spectrographic f i e l d methods for

the semiquanti t a t i ve analysis of geologic materials : U.S, Geological

Survey Circular 591 , 6 p.

Ward, F. N., Nakagawa, H. M., Harms, T. F., and Vansickle, G. H., 1969,

Atomic-absorption methods of analysis useful in geochemical

exploration: U.S. Geological Survey Bulletin 1289, 45 p.

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0 ~ 0 0 0 00000 comma 0 ~ 0 0 0 O o m O Q m o o 0 0 o o o o c c o c o a o a c o o N N N N ~ U r c r - v m ~ r r r N - ~ N C - N - - N ~ N N N N NIVNNN N N ~ N N N N N N ~

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w bJ A h A A A A A A A A A V)

NN N N NNNN N N N N I o o o c 3 0 0 a N

E Z r t r z z x Z 3 2 8 r 8 z z o c c o o z X z z r t t t z z z t z z z z o z z s z z o z t z

VI W W W W N W N U l N N N N W N N W N W W W W W N N W N N W W N N W N N N W N W W W N N N N W I 30000 c a d 0 0 0 o o o m o o w o o o o o a o o oooaca o o o o o 00000 o o a o o - a o a ~ o P D D O D ~ o o a o 0 0 m o o o a o o o aooom o a o w o w o o o a o o o o o a

4 A 4 4 4 d 4 I O r n V r n Q & * W O W ****a * O W C a U c s m - 0 - a v . 9 u l o . m Q-4Yo.m W Q L - m P w w - 4 - 9 - O W W O O 0 ~ 3 ~ 0 0 o o o a w o o o w a o o o o o w - o w o w o w m a o o o w o o m w o w z

I

Table 1.--Semiquantitative spectrographic and atomic-abeorption analyaes of minus-80 mesh fraction of streem-sediment samples from Hedfra quadrangle, Alaska.--continued

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H l 4 l S H? 4 2 s M 1 4 3 S 8 1 4 4 s M I 4 5 5

M l C b S - H 1 4 7 5 H T 4 8 S M l 4 Q S

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