Assignment 8 - Deformation
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School
University of Texas, El Paso *
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Course
1313
Subject
Geography
Date
Dec 6, 2023
Type
docx
Pages
2
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1.
How a reverse fault is different from normal fault and how it is different from a
thrust fault, show sketches and label the items (hanging wall, foot wall, fault plane
and movement direction).
Reverse faults are dip slip faults in which the hanging wall block moves up relative to the
footwall block. Thrust faults are a type of reverse faults having dips less than 45 degrees and are
most pronounced along convergent plate boundaries.
2.
Compare rock deformation in near surface environments to that deep within the
Earth's crust. Show Sketches for deep and shallow environment
Brittle deformation is more common near the surface. Ductile deformation is a more common
depth.
3.
Explain the role confining pressure will have on rock strength and how the rock will
deform under pressure.
Confining pressure exerts equal pressure in all directions. As a result, the rocks are tightly
compressed, which makes them stronger. When such rocks are subjected to stress, they will be
more likely to bend rather than break.
4.
The Appalachian Mountains were formed when the North American continent
collided with Africa over 250 million years ago to form the supercontinent Pangaea.
What sort of structural features would you expect to find in this region? Explain
your answers.
Since this is a convergent boundary, expected features would include folds such as anticlines and
synclines as well as reverse or thrust faults.
5.
Explain the difference between an antiform and an anticline.
An antiform is a type of geologic structure that is the opposite of an anticline. An anticline is a
fold in rock layers that forms an upward arch, while an antiform is a fold that forms a downward
arch. In other words, an anticline is a structure that is concave upward, while an antiform is a
structure that is concave downward. The main difference between the two is the direction of the
curvature.
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