Lecture_7 _Plate Tectonics

Lecture_7 _Plate Tectonics - 8 Plate Tectonics Plate...

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9/ 9/ 2011 1 Lecture 7: Plate Tectonics, Plate Boundaries and Earth’s Interior GEOL 1014 09/ 09/ 2011 Alfred Wegener - A theory that explains the observed motion of Earth’s lithosphere through subduction and seafloor spreading, resulting in the creation of continents and ocean basins. Plate Tectonics
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9/ 9/ 2011 2 Plate tectonics Hawaiian Islands Mt. Everest Pangaea Alfred Wegener Fit of the Continents
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9/ 9/ 2011 3 Fossil evidence Similar Rock Types and Structures Today Pangaea
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9/ 9/ 2011 4 Paleoclimate evidence Today Pangaea Apparent Polar Wandering Curves Global bathymetric map Marie Tharp and Bruce Heezen, 1959
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9/ 9/ 2011 5 Seafloor spreading Magnetic Field Today: compass points N Past: compass points S Paleomagnetism
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9/ 9/ 2011 6 Magnetic Reversals Magnetic reversals Magnetic reversals and seafloor spreading
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9/ 9/ 2011 7 Global distribution? Age of Seafloor Plate Tectonics
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9/ 9/ 2011
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Unformatted text preview: 8 Plate Tectonics Plate Tectonics Plate Tectonics: Today 9/ 9/ 2011 9 Dynamic Earth: Plate tectonics Convection Mantle convection drives plate motion 9/ 9/ 2011 10 Wadati-Benioff Zone Internal Structure Earth’s plates Seven major plates; seven intermediate; over a dozen smaller ones 9/ 9/ 2011 11 Divergent boundary: Mid-ocean ridge Continental Rifting 9/ 9/ 2011 12 East African Rift Zone Convergent Boundary 9/ 9/ 2011 13 Convergence Example: Andes Mountains; Cascade Range Figure 2.23 C Convergence Example: Himalaya 9/ 9/ 2011 14 Transform boundaries Plates slide past each other no new lithosphere created no lithosphere consumed fracture zone- a system of breaks in oceanic crust consisting of a transform fault and associated fractures. Transform fault 9/ 9/ 2011 15 9/ 9/ 2011 16 1963-1988, M 5+ Most earthquakes occur at plate boundaries Most volcanoes located at plate boundaries...
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This note was uploaded on 10/12/2011 for the course GEOL 1014 taught by Professor Aufill during the Spring '08 term at Oklahoma State.

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Lecture_7 _Plate Tectonics - 8 Plate Tectonics Plate...

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