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Geological Evolution of Western North America and East Pacific Rise Interaction

Explore the fascinating earth processes of the Western North American landmass and East Pacific Rise interacting through bathymetry, terrane accretion, and plate movements. Discover the tectonic history with plate reconstructions and the formation of notable geological features like the Sierra Nevada batholith and San Andreas Fault.

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Geological Evolution of Western North America and East Pacific Rise Interaction

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  1. East Pacific Rise moving into North America Seafloor bathymetry seafloor age, Ma

  2. Terrane accretion

  3. Suspect terranes along western North America

  4. Interaction of East Pacific Rise and Western North America • See Tanya Atwater’s plate reconstructions • As before, you need Quicktime to run this file. You can also download the file; it’s big, over 15 mb

  5. Western North American Transform system This is a mercator projection with the pole of the projection = pole or relative motion between the Pacific and North American Plates American Plate Pacific Plate Black areas = magmatic extrusives; lines = faults double lines = segment of oceanic spreading ridges

  6. Snake River plain (Yellowstone hot spot track) Idaho batholith Basin and Range Rio Grande Rift Colorado Plateau Remnant of Farallon Plate Cascadia vocanic arc Sierra Nevada batholith San Andreas Fault Gulf of California

  7. Shaded, 90m DEM

  8. Basin and Range Sierra Nevada Great Valley San Andreas Fault system Colorado Plateau Transverse Ranges

  9. San Andreas transform system

  10. San Andreas-Hayward- Caleveras system in region of San Francisco

  11. San Andreas system in Southern California in the region of Los Angeles

  12. Rotating blocks in Southern California

  13. Rotating blocks in Southern California

  14. Paleomagnetic declinations

  15. Transverse Ranges formed by rotations Oligocene Miocene-Pliocene

  16. Transverse Ranges formed by rotations Present

  17. transpression and transtension

  18. crustal thinning: basins crustal shortening: mountains

  19. overriding plate of subduction zone

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