4. CA Geology All

4. CA Geology All - Geology of Western North America A...

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1 Geology of Western North America A brief tour of rock types, tectonics, and evolution of the region Will California fall into the sea? How did California evolve? First Note Topography and Geography of WNA 632 Central and Western US topography 602 Western US Relief Yellowstone hot spot Great Valley (syncline) Basin and Range (extension) Colorado Plateau (uplifted block) Rio Grande Rift (extension) California California Geomorphic Provinces Klamath Mts Modoc Plateau Sierras Coast Ranges Great Valley Basin and Range Mojave Transverse Ranges Salton Trough 601 CA Geo Map Simplified Geologic Map (USGS &CDMG) red = granite yellow = Quat. alluvium pink = basalt orange, gray = melange = accretionary wedge, mix of sea floor and sediments, some once deeply buried
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2 Badwater Mt Whitney Ring of Fire Andean suubduction zone How do we form rocks like those in Coast Ranges and Sierras? Subduction Zones! (drawing from Press et al.) Sierra granites Coast ranges are scraped from seafloor or formed in basins of an ‘accretionary wedge’ Sierra Roof Pendant Conclusion: Many of the rocks in CA were formed in a subduction zone Sierra granites Coast ranges are scraped from seafloor or formed in basins of an ‘accretionary wedge’
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3 Present Tectonics in W. NA • Subduction in Pacific NW • Rifting in Gulf of CA • San Andreas site of horizontal motion 609 N. Pacific seafloor 608 Juan de Fuca Plate Juan de Fuca Subduction 607 Mt Shasta Mt. Shasta Vc-15. Cascade Volcanoes. View southward over Mt. Washington (L. foreground--eroded conduit), Belknap Crater (R- -shield), basalt flows, and the Sisters (bkg). OR.
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4 611 Mt St. Helens before 612Mt. St. Helens erupts 615 MSH 2 PM 613 Aerial View MSH 616 MSH Ash deposits 614 MSH after
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This note was uploaded on 11/30/2010 for the course GEOL 125Lxg at USC.

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4. CA Geology All - Geology of Western North America A...

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