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Alfred Wegener (1880-1930). Mid Atlantic Ridge. Mid Ocean Ridge System. Sea Floor “Stripes”. http://atlas.geo.cornell.edu/education/instructor/tectonics/polarity.html. Convergent Margin. Major Lithospheric Plates. Source: NASA. Plate Configuration of PNW. Plate Margins.
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Sea Floor “Stripes” http://atlas.geo.cornell.edu/education/instructor/tectonics/polarity.html
Major Lithospheric Plates Source: NASA
Plate Margins • Divergent margins: spreading centers where new lithosphere (sea floor) is created • Convergent margins: plates are moving toward each other • Transform margins: plates move past one another without creating or destroying lithosphere
Mantle Convection Source: University Montpellier
Plate Margins Source: USGS
Juan de Fuca Ridge Source: GSC
Plate Margins Source: USGS
Plate Margins Source: USGS
Juan de Fuca Ridge Source: GSC
Continental-Continental Convergence Source: USGS
Himalayas Source: USGS
Transform Faults Left-Lateral Right-Lateral
Volcanism and Plate Margins Source: Smithsonian
Plate Tectonics Control • Igneous rock types (type and location of volcanism) • Seismic activity (type and location of earthquakes) • Location of sedimentary basins • Location of uplifts or mountain ranges • Location of ocean basins
Interval Age (my) Distance (kms) Rate (cm/yr) 1 0.8 180 22.50 2 1.3 3 1.8 4 2.6 5 3.7 6 5.1 7 10.3 8 12 9 18.9 10 20.6 11 27.2 12 42.4 Table