# Lab # 5 Review

Lab # 5 Review Fractures, Faults, & Friction Coulomb Failure Law QuickTime and a decompressor are needed to see this picture.

QuickTime and a decompressor are needed to see this picture. Byerlees Law QuickTime and a decompressor

are needed to see this picture. Envelope of Frictional Sliding QuickTime and a decompressor are needed to see this picture.

Importance of Differential Sress QuickTime and a decompressor are needed to see this picture. Sandbox Experiment

QuickTime and a decompressor are needed to see this picture. Andersons Theory of Faulting QuickTime and a decompressor

are needed to see this picture. Principal Stresses and Faulting QuickTime and a decompressor are needed to see this picture.

QuickTime and a decompressor are needed to see this picture. Lab #7 Balancing & Restoring Cross Sections

Structure of the Lab Go through terminology and example

Build a simple cross section (Problem 1) Restore a simple cross section (Problem 2) Start working on assignment, Problem 3 Cross Sections

Deformed Cross Section: subsurface geology as it is now Restored Cross Section: what subsurface looked like before deformation Balanced Cross Section: deformed cross

section capable of being restored Fold and Thrust Belt result of crustal shortening Older Younger

Foreland Hinterland flat

ramp blind thrust Assumptions

Conservation of Area Consistency of Bed Length Plane Strain

Break-Forward Sequencing Forward Ramping Faults Kink-Style Folds Kink Folds Kink Method Example

We first find the line L12 that bisects the angle between dips 1 and 2 Extend the dips out to L12. When you cross the line, continue with the dip on the opposite side Continue Plotting Axial Traces (Steven Dutch)

Completed Beds (Steven Dutch) Fill in the Lithologic Units (Steven Dutch)

Restoring a Cross Section

Identify the foreland & hinterland Identify the transport direction Choose a pin line Label each point where the trace of the axial plane of a fold crosses a contact - these will be

your line segment end-points restore youngest fault first restore line segments evaluate your loose line Bed Length Conservation If you encounter a

folded layer in the deformed cross section that does not intersect a fault, simply reproduce it as a horizontal line in the restored section. Restoring a Cross Section - Faults Follow the fault in the direction opposite the

Transport Direction until you hit the ramp. Draw a horizontal line segment at the top of the ramp with the same length as you measured above for the line segment. Faults should be reproduced as they are (without making lines horizontal) unless they show signs of being folded by younger stage faulting. This is part

of why we restore youngest faults first! Chevron Fold QuickTime and a decompressor are needed to see this picture.

Kink bands QuickTime and a decompressor are needed to see this picture.

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