Geology 404C Plate Tectonics & Earth History Outline 4

Geology 404C Plate Tectonics & Earth History Outline 4...

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    Outline 4 2/5/03   Exotic terranes (W. Rockies, elsewhere?), tectonic tracers      (Appalachians, W. Europe)   Plate tectonics and fossil distributions      Continent-to-continent collisions - head-on                                                     - glancing - N+S Amer.      World-wide biosphere diversity           supercontinents as a cause of extinction?   Spreading cycles + ocean chemistry - calcite vs. aragonite seas,       affects on deposition, organisms     Outline 4A Unresolved Issues and Anomalies of Present-day Plate Tectonics
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1. How important are the different proposed mechanisms for plate movements  (spreading or subduction factors at the back or front of a plate vs. convection  currents underneath? Are convection currents driving plates or are plates driving  convection currents? 2. Is convection in the mantle shallow (entirely within the asthenosphere) or deep 
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This note was uploaded on 05/05/2011 for the course GEO 404c taught by Professor Staff during the Spring '08 term at University of Texas.

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Geology 404C Plate Tectonics & Earth History Outline 4...

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