Geol111_ Rock Deformation_2007

Geol111_ Rock Deformation_2007 - Click to edit Master...

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Unformatted text preview: Click to edit Master subtitle style Rock Deformation: Excursions in Structural Geology Rock Deformation • Stress: the pressure or force applied to rocks that cause deformation • Uniform (confining) stress is equal in all directions • Differential stress is not equal in all directions • Three types of differential stress – Tensional - pulling apart – Compressional - squeezing together – Shear - slipping, twisting, or wrenching • Strain is the result of applying a stress to a rock – Ductile deformation • Irreversible change in size and/or shape • Volume and density may change – Brittle deformation - Fracture • Stress exceeds the ductile limit Geometry of Rock Structures • Structures defined by the orientation of planes – Dip – the angle of inclination downward from a horizontal plane – Strike – the compass bearing of a horizontal line where the inclined plane intersects an imaginary Joints...
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Geol111_ Rock Deformation_2007 - Click to edit Master...

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