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DA VBA progversio n 1.0.7 - Jun e18, 2

Josh Wilson & M

Department of G

602 South Colle

Greencastle, IN

765-658-4666 (o

765-658-4732 (f

mswilke@depau
mailto:[email protected]:[email protected]

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TACHam for modeling detachment folds04

. Scott Wilkerson

osciences

e Avenue

6135

x)

.edu

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Limb Rotation(Model 2)

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Authors

Reference

Acknowledgements

The "Fine Print"

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Running the Program

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User Input Advice

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Assumptions

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Josh Wilson & M. Scott Wilkerson

Department of Geosciences, 602 South College Avenue, Greencastle, IN 46135

765-658-4666; [email protected]

Poblet, J. and McClay, K., 1996, Geometry and kinematics of single-layer detachment folds, AAPG Bulletin, v. 80, n. 7, 1085-1

Special thanks to Josep Poblet for providing his original Basic code on which our program is based.

This software is provided to non-commercial users at no charge. This software is provided "as is" without any warranty.

The authors will not be liable/responsible for direct, indirect, incidental, or consequential damages resulting from any defect in

The authors will not be liable/responsible for versions of this software that become modified and distributed either under their

Persons using these programs are requested to appropriately acknowledge/reference their use in any written or electronic doc

These macros have been tested on Excel for Macintosh 2001 and X and on Excel for Windows 2000.

It is likely that they will work on any version of Excel that can import Visual Basic for Applications (VBA) macros, but this has n

Comments regarding the program are welcome and should be addressed to Scott Wilkerson at the address above.

Open Excel workbook file and click on enable macros.

Click on the appropriate sheet tab at the bottom of the workbook page.

Click the "Run" button.

Fill in the dialog blanks and the program will calculate the appropriate values and then redisplay the graph.Dialog blanks will contain "suggested" values based on the last values in the worksheet cell.

Model comparisons are facilitated by placing certain "watch" variables in the Calculations sheet and the graphs on the Graphs

Edit the macros by selecting Tools->Macro->Visual Basic Editor and then double-clicking any of the modules (disabled on pro

Clicking the "Output" button will transfer (x,y) points to a new sheet that can then be exported as a tab-delimited text file.

The program can be exited at any time by quitting Excel.

When slip (S) is too large relative to where the fault tip (Tip) is specified, the variable "Back" will become negative and the fold

To fix this, move the fault tip towards the foreland and/or extendthe length of the section.

For guesses of forelimb dips, choose numbers greater than 0, but much less than the expected value.

If the angle isn't small enough, the program will just accept the input as the correct answer and will not iteratively seek a soluti

Because of the wide range of input values, there undoubtedly exist geometric impossibilities or "lock-up" points.

Geologic reasoning, therefore, should be applied when inputting values and when interpreting results.Most dialogs are not error-checked for input values. If you exceed "lock-up" points, the macros may hang.

To interrupt a macro at any time, press ESCand then click on "end".

The graphs show the geometry of the top of the ductile unit. Competent units can be added by modifying the macros.

The graphs' x-axes are fixed assuming a total cross-section length of 1000, and the y-axes are fixed to provide an approximat

Clicking an axis and selecting the "Scale" tab will allow the graph properties to be changed.

For Rotation & Migration models with Backlimb/Forelimb Ratios = 1, use 1.01. Do not use ratios less than one.

All models are placed in the cross section with the anticlinal crest centered on the fault tip.

The sheets can be modified to draw the folds relative to the fault tip, to the backlimb, or to some other reference point within th

Axial surfaces are calculated assuming a "common" configuration. They bisect the angles within the competent unit, but don't

of how the folds are located relative to the fault tip. Where axial surfaces cross, the folds are drawn correctly and the crossing

Shear and non-parallel folding in the competent unit are not incorporated into the model.

All models assume that the degree of fold asymmetry of the folds does not vary during fold evolution.All models assume a constant, user-specified top crest length.

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109.

this software.

ames or the names of others.

uments.

ot been tested.

sheet.

ected versions).

backlimb will be drawn incorrectly.

n.

1:1 section.

e section.

necessarily correlate with the fault because

segments may be ignored.

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60.00 RF Forelimb Dip

30.00 RB Backlimb Dip x y

100.00 LT Top Length a 150.00 360.71

204.90 LF Forelimb Length b 242.64 360.71

354.90 LB Backlimb Length c 550.00 538.16

1.73 X Backlimb/Forelimb Ratio d 650.00 538.16

150.00 S Slip e 752.45 360.71

360.71 Z Depth to Detachment f 1000.00 360.71

177.45 U Uplift

54105.80 FCA Fold Core Area

90.00 IA Interlimb Angle x y

30.00 APD Axial Plane Dip FAULT 0.00 0.00

600.00 0.00

FAS1 752.45 360.71

544.20 0.00

600.00 Tip Fault Tip Location FAS2 650.00 538.16

1000.00 TL Total Xsection Length 581.70 419.86

1.73 TAN Psi BAS2 550.00 538.16

3.73 TANPhi 581.70 419.86

45.00 Gamma 469.20 0.00

3.7321E+00 TAN Delta BAS1 339.29 0.00242.64 360.71

208.25 X3 ASIX1Y1 469.20 0.00

247.55 Front Foreland Flat Segment ASIX2Y2 581.70 419.86

92.64 Back Hinterland Flat Segment

96.65 X4

0.0174533 pi/180

Axial Surface Graph Points

Fold Graph Points

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Hinge Migration(Poblet & McClay, 1996 - Model 1)

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100.00 LT Top Length a 100.01 89.59



2.00 LB/LF Backlimb/Forelimb Ratio d 750.00 186.42

100.00 S Slip e 774.99 89.59

100 Zi Initial Depth to Detachment f 1000.00 89.59

89.59 Z Depth to Detachment

96.83 U Uplift

19364.87 FCA Fold Core Area x y

100.01 X Slip FAULT 0.00 0.00

75.51389895 IA Interlimb Angle 700.00 0.00

66.71305053 APD Axial Plane Dip FAS1 774.99 89.59

705.58 0.00



1.29 TAN Psi BAS2 650.00 186.42

3.87 TAN Phi 675.00 89.61

37.76 Gamma 636.43 0.00

2.3234E+00 TAN Delta BAS1 498.14 0.00475.00 89.59

69.41 X3 ASIX1Y1 636.43 0.00



23.13 X4

0.0174533 pi/180

100000 Orig Area Zi*TL=Original Area

100000 Final Area Z*(TL-S)+FCA=Final Area

Fold Graph Points


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Limb Rotation(Poblet & McClay, 1996 - Model 2)

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100.00 LT Top Length a 50 192

53.98 LF Forelimb Length b 397 192

161.96 LB Backlimb Length c 550 244

3.00 X Backlimb/Forelimb Ratio d 650 244

50.00 S Slip e 663 192

192.00 Z Depth to Detachment f 1000 192

52.47 U Uplift

9598.96 FCA Fold Core Area

84.72 IA Interlimb Angle x y

61.26 APD Axial Plane Dip FAULT 0.00 0.00

49.99 (Y / Z) 600.00 0.00

191.98 (A / S) FAS1 662.71 192.00

511.68 0.00



1.27 TAN Psi BAS2 550.00 244.47

6.01 TAN Phi 567.47 139.55

42.36 Gamma 490.94 0.00

1.82 TAN Delta BAS1 428.74 0.00396.77 192.00

151.03 X3 ASIX1Y1 490.94 0.00



31.9619679 X4

0.01745329 pi/180

Fold Graph Points


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Rotation & Migration-Dahlstrom(Poblet & McClay, 1996 - Model 3)

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75.31 RF Forelimb Dip Fold Graph Points


100.00 LT Top Length a 200.00 249.89



1.33 X Backlimb/Forelimb Ratio d 550.00 416.23

200.00 S Slip e 593.59 250.00

250.00 Z Depth to Detachment f 1000.00 250.00

166.23 U Uplift

249.86 Y

33300.14 FCA Fold Core Area x y

58.03 IA Interlimb Angle FAULT 0.00 0.00

75.68 APD Axial Plane Dip 500.00 0.00

FAS1 593.59 250.00

400.69 0.00



1.30 TAN Psi BAS2 450.00 416.23

2.32 TAN Phi 485.85 333.09

29.02 Gamma 400.80 0.00

3.92 TAN Delta BAS1 400.85 0.00293.03 249.89

192.90 X3 ASIX1Y1 400.80 0.00



107.82 X4

0.01745329 pi/180

Note: Model sensitive to low depths to detachment.


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Hinge

MigrationLimb Rotation

Rotation &

Migration -

Dahlstrom

Rotation &

Migration -

Blay

RF Forelimb Dip 60.00 75.53 76.38 75.31

RB Backlimb Dip 30.00 28.96 18.90 46.66

LT Top Length 100.00 100.00 100.00 100.00LF Forelimb Length 204.90 100.00 53.98 171.85

LB Backlimb Length 354.90 200.00 161.96 228.71

X Backlimb/Forelimb Rati 1.73 2.00 3.00 1.33

S Slip 150.00 100.00 50.00 200.00

Z Depth to Detachment 360.71 89.59 192.00 250.00

U Uplift 177.45 96.83 52.47 166.23

FCA Fold Core Area 54105.80 19364.87 9598.96 33300.14

IA Interlimb Angle 90.00 75.51 84.72 58.03

APD Axial Plane Dip 30.00 66.71 61.26 75.68

X Slip 100.01

(Y/Z) 49.99

(A/S) 191.98

Y 249.86

*Bold = Input values

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2004_06_18_DETACH_1_0_7p