Earth Sciences 1022A/B Lecture Notes - Lecture 9: Azimuth, Monocline, Asthenosphere
7 Dec 2015
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Earth sciences 1022a lecture 9 crustal deformation. Rocks can be deformed to produce structures that can yield energy and ore reserves. When rocks are stressed beyond their strength they change shape and size. Stress (force) on rocks, there are three different types. Rocks are being pulled apart, usually because plates are moving apart from each other because of the convection of the asthenosphere underneath. What happens to rocks being stressed (stress is the force, strain is the result) Under stress, rocks can exceed the elastic limit before flowing (ductile deformation) or being fractured (brittle deformation) Strong rocks tend to fracture while weak rocks tend to flow (in the solid state) however, with enough time even strong brittle rocks will eventually flow. Strike: azimuth of a horizontal line on the surface of a plane. Dip: angle of inclination of the surface from horizontal. Folds: compressional forces o o o o o. Strike slip: movement laterally along strike of fault.
