7-Deformation - Deformati on(Chapter Click to edit Master...

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Click to edit Master subtitle style 3/1/11 Deformati on
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3/1/11 Why should we care? Loma Prieta, 1989 San Francisco, 1906 Earthquak es! Oil and Gas!
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3/1/11 Deformation Forces (Stresses) Rocks deform in response to forces (stresses) acting on them. 1) Tensional forces : pulls rocks apart; stretching (divergent boundary) 2) Compressive forces : pushes rocks together; squeezing; shortening (convergent boundary) 3) Shearing forces : pushes either side of a formation in opposite directions (transform boundary)
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3/1/11
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3/1/11 Deformation and Plate Boundaries Most deformation occurs near plate boundaries. shearing tensional compressive
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3/1/11 Rocks Response to Forces Brittle vs. Ductile Behavior Brittle (think potato chip): minor internal strain, catastrophic break example: bending glass at room temperature Ductile (think modeling clay): smooth, continuous plastic deformation example: slowly bending a copper wire
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3/1/11 Ducti le Brittl e
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3/1/11 Variables that control which response occurs: - Temperature - Confining pressure - Deform quickly vs. slowly (strain rate) - Type of force - Rock type (mineralogy) - Water content Rocks Response to Forces Brittle vs. Ductile Behavior
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3/1/11 Is ice brittle or ductile?
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3/1/11 Low confining P Low T High strain original brittle ductile High confining P High T Low strain rate
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This note was uploaded on 03/01/2011 for the course GEO 302D taught by Professor Rowe during the Spring '07 term at University of Texas.

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7-Deformation - Deformati on(Chapter Click to edit Master...

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