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ESS112-lect-4-09-new

ESS112-lect-4-09-new - Brittle Deformation 1 Joints Modes...

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Brittle Deformation 1: Joints
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Modes of deformation: (a) Flow: distributed deformation (b) Slip: faulting 2. Deformation Mechanisms: (a) Brittle deformation : (1) discrete deformation (it is a scale-dependent concept; it can be both slip or flow); deformation by breaking rocks (vague). (b) Ductile deformation : penetrative deformation (also a scale- dependent concept; it can be both slip or flow). (c) Plastic deformation : It refers to two things, (a) irreversible deformation after stress reaches the yield strength of material, and/or (b) crystal plastic deformation referring to deformation achieved by rearranging crystal lattice and expressed by dynamic recrystallization. (d) Cataclastic deformation : deformation achieved by frictional sliding and fracturing of rocks without changing the arrangement of crystal lattice.
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Joints control regional morphology (Southern tip of Sinai Peninsular)
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Classification of cracks Mode I: Motion perpendicular to plane Mode II: Parallel to plane but perpendicular to intersection line Mode III: Parallel to plane and intersection line Strike-slip faulting Tensile fractures Dip-slip faulting
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