deformationRock - DEFORMATION OF ROCKS [L17P.363373/IPB]...

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DEFORMATION OF ROCKS OF ROCKS [L17 P. 363-373  /IP-B] [L17 P. 363-373  /IP-B]
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Deformation of Deformation of rocks rocks Folds and faults are geologic structures. Structural geology - the study of the forces that deform rocks (stress applied) and the effects of this force (strain).
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Phil Dombrowski Fig. 10.1 Small-scale Folds
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Small-scale Faults Tom Bean Fig. 10.2
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Stress Stress (force per unit area) (force per unit area) Types of directed (or differential ) stresses include : Compression - shorten Extension - elongate Shear - distort shape
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Differential stress
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Strengt Strengt h h Ability of an object to resist deformation (low pressure vs. high pressure)
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Strai Strai n n is any change in original shape or size of an object in response to stress acting on the object
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Types of deformation Types of deformation Elastic Ductile (plastic) Brittle (rupture)
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Elastic deformation Elastic deformation T emporary change in shape or size that is recovered when the deforming force is removed Think “rubber band”
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Ductile (plastic) deformation Ductile (plastic) deformation Permanent change in shape or size that is not recovered when the stress is removed Occurs by the slippage of atoms or small groups of atoms past each other in the deforming material, without loss of cohesion Think “deck of cards”
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Brittle deformation (rupture (rupture ) ) Loss of cohesion of a body under the influence of deforming
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deformationRock - DEFORMATION OF ROCKS [L17P.363373/IPB]...

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