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Tectonics of the Sierra Nevada

Tectonics of the Sierra Nevada. “The grandeur of these forces and their glorious results overpower me, and inhabit my whole being.” John Muir. Geography of the Sierra Nevada. Sierra Nevada Photos, 2010. Photo edited from Dr. Bartley. Physical Characteristics of the Sierra Nevada.

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Tectonics of the Sierra Nevada

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  1. Tectonics of the Sierra Nevada “The grandeur of these forces and their glorious results overpower me, and inhabit my whole being.” John Muir

  2. Geography of the Sierra Nevada Sierra Nevada Photos, 2010 Photo edited from Dr. Bartley

  3. Physical Characteristics of the Sierra Nevada Satellite photo of eastern Sierra Nevada N S South North Sierra Nevada Photos, 2010

  4. Sierra Nevada Structure and Motion Composition Granite solidified below the surface between 210 ma and 80 ma. Cooled magma chamber to the Sevier Orogeny Some metamorphosed rock is preserved on the tops of mountains as “roof pendants” Currently Motion of the SierranMicroplate is independent of the stable portions of the North America plate Motion relative Pacific Plate is NW 38 mm/yr Relative to the North America plate NW 11-13 mm/yr Active faulting on the east (steep) side of Sierra Nevada Unruh J et al. Geology 2003;31:327-330

  5. Formation of the Sierra Nevada Uplift Processes FarallonPlate Subduction 210-80 ma Sevier/Laramide orogeny Batholith formation Several hundred plutons of various sizes, ages, and isotopic signatures Delamination of Sierra Nevada Microplate 2-3 ma (10 ma?) Tilting of batholith block to west Variation in Moho depth along Sierra Nevada (~42 km in North to 30 km in South) Disappearance of the Moho south and east of Fresno, CA Low gravity anomaly in the southern Sierra Nevada associated with delamination Volcanic Activity Period of volcanic activity began 30 ma and continues today Zandt, et al.

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