East Pacific Rise moving into North America

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Presentation transcript:

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

Terrane accretion

Suspect terranes along western North America

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

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

San Andreas Fault 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

Shaded, 90m DEM

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

San Andreas transform system

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

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

Rotating blocks in Southern California

Rotating blocks in Southern California

Paleomagnetic declinations

Transverse Ranges formed by rotations Oligocene Miocene-Pliocene

Transverse Ranges formed by rotations Present

transpression and transtension

crustal shortening: mountains crustal thinning: basins

overriding plate of subduction zone