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tectonics - Plate Tectonics Plate Fig.4.04 W W Norton...

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Plate Tectonics Plate Tectonics
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W. W. Norton
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W. W. Norton. Modified from Sloss, NOAA 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
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W. W. Norton Plate boundaries Active margins – Passive margins
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Contact of continental crust And oceanic crust Passive margin No plate boundary along this margin!
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i-clicker question! Which one of these is a passive margin? A B C D E
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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
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W. W. Norton Three types of margins 1. Divergent 2. Convergent 3. Transform
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Divergent Boundaries Where new crust is formed
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04_09.jpg North Atlantic mid-ocean ridge topography Note rift valley in mid-ocean ridge
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W. W. Norton Mid-ocean ridge = MOR
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04_08.jpg Ocean crust – mafic (basalt + gabbro) crust Oceanic lithosphere
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The process of The process of
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