Ch10_Outline

Ch10_Outline - Chapter 10 Crustal Deformation Structural...

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1 Chapter 10 Crustal Deformation Structural geology ± Structural geologists study the architecture and processes responsible for deformation of Earth’s crust ± A working knowledge of rock structures is essential to our modern way of life Deformation ± Deformation is a general term that refers to all changes in the original form and/or size of a rock body ± Most crustal deformation occurs along plate margins ± Deformation involves Force – that which tends to put stationary objects in motion or changes the motions of moving objects
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2 Deformation ± Deformation involves Stress - force applied to a given area Types of stress Compressional stress – shortens a rock body Tensional stress – tends to elongate or pull apart a rock unit Shear stress – produces a motion similar to slippage that occurs between individual playing cards when the top of the stack is moved relative to the bottom Deformation ± Strain – changes in the shape or size of a rock body caused by stress ± How rocks deform Rocks subjected to stresses greater than their own strength begin to deform usually by folding, flowing, or fracturing Deformation ± How rocks deform General characteristics of rock deformation Elastic deformation – the rock returns to nearly its original size and shape when the stress is removed Once the elastic limit (strength) of a rock is surpassed, it either flows ( ductile deformation ) or fractures ( brittle deformation )
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3 Deformation ± How rocks deform General characteristics of rock deformation Factors that influence the strength of a rock and
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This note was uploaded on 07/17/2008 for the course GS 121 taught by Professor Leavell during the Fall '07 term at Ohio State.

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Ch10_Outline - Chapter 10 Crustal Deformation Structural...

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