ROCK DEFORMATION FAULTING FOLDING WHATS THE DIF WHAT

ROCK DEFORMATION FAULTING & FOLDING

WHATS THE DIF?

WHAT DAT?

Elastic Deformation 1. Original shape 2. Shape under stress 3. Shape with stress removed

Effects Of Plate Locking

How a rock responds to stress depends on: • • Composition of the rock Temperature of location Amount of pressure in surrounding rock Length of time stress is applied v. Bending (Folds) = high temp. & pressure v. Fractures (Faults) = most near surface

NORMAL FAULT Scarp (cliff) Divergence of plates

Fault Scarp (cliff)

Scarp REVERSE-THRUST FAULT Convergence of plates

Scarp Cliff

HORST

GRABEN

Shearing Tearing Slip-Strike Fault Transform

Cascadia Subduction Zone Transform Faults

Bird’s Eye View Extends up the coastline of B. C. Becomes Queen Charlotte Fault

FOLDING Best seen in Sedementary rocks Warping of rock layers from crustal compression

ANTICLINE

SYNCLINE

syncline anticline

RECUMBANT FOLD Greater force on one side Anticline collapses on the syncline

Nappe

Continued compression creates a fault line which separates the anticline from the syncline

Erosion of Folds

COMPRESSION

Synclinical Hill

If the process illustrated in the diagram below continues, the resulting feature will be a(n) A. island arc. B. rift valley. C. fold mountain. D. shield volcano.

Before erosion altered the landform in the diagram below, feature X was a(n) A. graben. B. volcano. C. syncline. D. anticline. X

A normal fault is best depicted by which diagram below? B A D C

Video: Born of Fire