111-pp21 - UNIVERSITY OF SOUTH ALABAMA Last Time. Rock...

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1 GY 111: Physical Geology GY 111: Physical Geology UNIVERSITY OF SOUTH ALABAMA Lecture 21: Folds Lecture 21: Folds Last Time… Rock Deformation A) Confining pressure and rock deformation B) Elastic versus permanent deformation C) Types of deformation Rock Deformation Rock deformation : any change in the volume, shape or orientation of a rock body. z Ductile deformation requires a significant component of plastic mechanical behavior Strain % Stress Elastic Limit e la s t ic plastic Ductile Deformation Ductile Deformation Distortion below the elastic limit is 100% recoverable Brittle Deformation z Brittle: rocks near the surface of the Earth behave as brittle materials Strain % Stress Rupture Brittle Deformation Distortion below the elastic limit is 100% recoverable Mechanical Behavior of Rocks Near-surface rocks that are under low T-P conditions behave as brittle material: z Fault fracture (slippage) z Joint fracture (no slippage) Deep rocks under elevated T-P conditions behave as ductile material: z Folding
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This note was uploaded on 02/04/2012 for the course GLY 111 taught by Professor Haywick during the Fall '11 term at S. Alabama.

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111-pp21 - UNIVERSITY OF SOUTH ALABAMA Last Time. Rock...

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