Lecture18 -...

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Unformatted text preview: http://www.jwolfe.clara.net/Humour/NonMedPicts/Stress-FishInBlender.gif Chapter 10 Crustal Deformation Deformation Deformation is a general term that refers to all changes in original form and/or size of 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 Force = (mass x acceleration) Stress - force applied to a given area in a solid Stress = (force / surface area) Pressure - force applied to a given area in a fluid Mass acceleration 0.5in 2 1in 2 0.5in 2 1in 2 force force force force 1in 2 1in 2 1in 2 1in 2 force force force force 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 cards sliding past each other when pushed from the side Figure 10.2 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 General characteristics of rock deformation Elastic deformation the rock returns to nearly its original size and shape when the stress is removed. fractures http://www.learner.org/jnorth/images/graphics/m/Muscle_RubberBand1.jpg http://www.learner.org/jnorth/images/graphics/m/Muscle_RubberBand2.jpg Elastic deformation of a rubber band. Band will return to original size after the stress is removed. 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,...
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Lecture18 -...

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