EESA06H3 Lecture : CHAPTER 11 (2012)

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22 Apr 2012
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What causes rocks to bend / break, how they behave when stressed. Change in bedrock can be caused my powerful forces originating deep within the earth. The geologic structures or architecture that results from these tectonic forces can be studied by geoscientists. Recognition of unconformities as well as principle of original horizontality, superposition, and cross- cutting relationships important structural geology as they are determining relative time. Structural geology: branch of geology concerned with the shape, arrangement, and interrelationships of bedrock units and the forces that cause them. Tectonic forces move and deform parts of the lithosphere- especially along plate margins. Can cause orientation, location, shape of rock changes. Originally horizontal layers can be deformed by tectonic forces that push or compress the layers together until they are shortened by buckling and breaking. Stress: force per unit area where stess can be measured, it is expressed at a particular point, but cant burry stress in rocks that are currently buried.

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