tectonics - Plate Tectonics Plate Tectonics W. W. Norton W....

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Unformatted text preview: Plate Tectonics Plate Tectonics W. W. Norton W. W. Norton. Modified from Sloss, NOAA Lithospheric mantle Cooler part of mantle Continental crust Less dense Oceanic crust More dense Lithosphere “floats” on asthenosphere Region rock name silica% density Continental granite high low Oceanic crust basalt/gabbro moderate moderate Mantle peridotite low high Core iron none highest W. W. Norton Plate boundaries Active margins – Passive margins Contact of continental crust And oceanic crust Passive margin No plate boundary along this margin! i-clicker question! • Which one of these is a passive margin? A B C D E Google Earth YOUNG OLD OLDEST Active margin Passive margin Craton Mountains, igneous rocks Flat or low mountains sedimentary rocks VERY flat metamorphic rocks sedimentary rocks W. W. Norton Three types of margins 1. Divergent 2. Convergent 3. Transform Divergent Boundaries Where new crust is formed 04_09.jpg North Atlantic mid-ocean ridge topography Note rift valley in mid-ocean ridge W. W. Norton Mid-ocean ridge = MOR 04_08.jpg Ocean crust – mafic (basalt + gabbro) crust Oceanic lithosphere The process of...
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This note was uploaded on 04/03/2012 for the course GEOL 100 taught by Professor Neitzke during the Fall '10 term at Rutgers.

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tectonics - Plate Tectonics Plate Tectonics W. W. Norton W....

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