EESA09H3 Chapter 11: EESA06 Chapter 11.doc

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23 Apr 2012
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Structural geology: branch of geology concerned with the shapes, arrangemnet, and interrelationships of bedrock units and forces that cause them. Tectonic forces move and deform parts of the lithosphere, particularly along plate mar- gins. Stress: a force per unit area (can only observe stress of rock bodies that are exposed, difficult for buried rocks) Strain: change in size (volume) or shape, or both, in response to stress. Compressive stress common along convergent plate boundaries and result in rocks being defromed by a shortening strain (changes in perpendicular direction to applied stress) Tensional stress: caused by forces pulling away from one another in opposite direc- tions, results in stretching or extension of material (changes in parellel direction to ap- plied stress) Tensional stress occurs at divergent plate boundaries (since rocks are very weak when pulled apart, fractures and faults are common)

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