EESA06H3 Chapter 11: Chapter 11 - Geologic Structures.doc

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Structural geology can be thought of as the study of the architecture of the. Earth"s crust, its deformational features, and their mutual relations and origins. Structural geology - the branch of geology concerned with the shapes, arrangements and interrelationships of bedrock units and the forces that cause them. Tectonic forces move and deform parts of the lithosphere, particularly along plate margins. Stress a force acting on a body, or rock unit that tends to change the size or shape of that body, or rock unit. Hard to measure stress in rocks that are currently buried. Strain the change in size (volume) or shape, or both of a body or rock unit in response to stress. Compressive stress a stress due to a force pushing together on a body. Common along convergent plate boundaries and typically results in rocks being deformed by a shortening strain.

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