Geol 9/6/18 - Testing the plate tectonics model-Evidence from paleomagnetism-Basaltic rock contains magnetite-When the basalt cools below the curie

Geol 9/6/18 - Testing the plate tectonics model-Evidence...

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Testing the plate tectonics model -Evidence from paleomagnetism -Basaltic rock contains magnetite. -When the basalt cools below the curie point the iron-rich minerals become magnetized and aligned with the magnetic field. -Magnetite is then “frozen” in position and forms a compass -Called paleomagnetism How is plate motion measured -Geologic measurement of plate motion -dates of ocean floor -measuring plate motion from space -GPS -measure plate motions to the millimeter What drives plate motion? -Researchers agree that convection in the mantel is the ultimate driver of plate tectonics Convection is a type of heat transfer that involves the movement of a substance(warm up cold sinks) Forces driving plate motions diagram(push,pull,drag) Models of plume-mantle convection diagram
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  • Spring '08
  • Olinsky

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