5. Continent Growth

5. Continent Growth - 1 Continents: Growth, Volume and...

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Unformatted text preview: 1 Continents: Growth, Volume and Arrangement Densities of Continental and Oceanic Crust Differentiation of Mantle to Make Crust Plate Tectonics: Melting and role of volatiles Building on the Margins Continental Crust through Time Tracking Plate Motions through time Why do we have continents? Divergent Boundary makes Ocean Crust (Press et al.) Melt dry mantle -> 1200C -> Basalt Andean suubduction zone Subduction Zone makes Continental crust. Has volatiles (water). Melts at 700C-> Granite (drawing from Press et al.) Granite Factory!! subduction zone Result: Minerals of Low Density make granite = continental crust Assembling Continents How do they grow? 2 Accretion of Terranes Press et al. (2003) Continents Grow Larger through Collisions Press et al. (2003) Example: India and Asia Collide Press et al. (2003) Himalayas Grow Press et al. (2003) Himalayas Annapurna Range 3 Annapurna Base Camp Himalayan Thrust 1 Himalayan Thrust 2 North America Digital Elevations Digital Elevations Press et al....
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5. Continent Growth - 1 Continents: Growth, Volume and...

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