Lecture 13 - GEOS 1004, SPOTILA Lecture 13, 10/15/09 PLATE...

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GEOS 1004, SPOTILA Lecture 13, 10/15/09 PLATE TECTONICS SOURCES OF EVIDENCE FOR PLATE TECTONICS 1) geography 2) how edges of continents fit together 3) topography of continents 4) bathymetry- topography of the ocean floor 2) When continents come back together stuff matches up (like a puzzle) - rocks -mountains -fossils 3)Active Earth Motions -earthquakes define boundaries between plates -volcanoes -gps, inSar (measures earths motions) 4) Position of continents with respect to earth (latitude and longitude): a) climate zones b) hot-spot traces (mantle plumes) c) geomagnetism -rocks have paleomagnetism that records orientation of magnetic field at the time the rock cooled Track motion of continents through geologic time by changes in inclination and declination based on paleomagnetism of rocks. PLATE TECTONICS - THE BASICS 1) Driven by mantle convection (heat transfer); slow, over millions of years, driven by density contrasts (gravity, heat). Upward part = spreading, heat loss at mid-ocean ridge
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This note was uploaded on 09/11/2011 for the course GEOG 1004 at Virginia Tech.

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Lecture 13 - GEOS 1004, SPOTILA Lecture 13, 10/15/09 PLATE...

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