chapter 2 - These rates (cm/yr) are essentially the same as...

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Understanding Earth Chapter 2: Plate Tectonics: The Unifying Theory Grotzinger • Jordan • Press • Siever
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Continent margin matches, esp. Africa and S America, – noticed in 16 th century 19 th century – Eduard Suess – Gondwana 1915 – Alfred Wegner – Continental Drift Supercontinent Pangea Development of Plate Tectonic Theory
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Early Observations – not only similar rock units, but similar fossils
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Sea Floor Spreading Hess and Dietz, 1962 Dots are earthquake locations
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Present Seafloor Spreading Magnetic Stripes polarity reversals magnetometers - WWII If new crust being produced, was the Earth expanding? (no)
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Not only are plate boundaries the sites of dynamic processes, but . . .
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Plates Today
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RATES OF PLATE MOVEMENT
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Unformatted text preview: These rates (cm/yr) are essentially the same as the growth rates of human ngernails (slow) and hair (fast)! Andean Boundary convergent boundary involving oceanic and continental plates What is the age of the oldest ocean crust? (Why?) PANGEA the most recent supercontinent PLATES (Institute for Geophysics) animation from 0 to 300 Ma This animation and many others on Earth through time are available at www.ig.utexas.edu/research/projects/plates/ The PLATES Project 100 million years into the Future-a prediction of what the plates might possibly look like Competing Mantle Convection Models hot spots e.g. Hawaiian chain...
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chapter 2 - These rates (cm/yr) are essentially the same as...

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