Lecture_10_Crust-1 - The Earths Crust C h a r a c te r is...

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1 The Earth’s Crust • Characteristics of crust – Age – Thickness – Density – Composition • How to make Crust – Melting mixtures: Binary phase diagrams – Chemical composition of melt • Partial melting • Melting from pressure drop • Incompatible elements (large ions) – Ocean crust: One episode of partial melting – Continental crust: Multiple episodes of partial melting
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3 Continental Crust: Old (0 - 3.8 billion years) Oceanic Crust: Young 0-200 million years
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4 Continental crust: Thick (30 km) Oceanic crust: Thin (5 km) Continental Crust: 2.7 g/cm 3 Ocean Crust: 2.8 g/cm 3 Mantle: 3.3 g/cm 3
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5 Continental crust: granite Oceanic crust: basalt Granite: quartz, feldspar, mica Basalt: olivine, pyroxene, feldspar Continental crust is ________ than oceanic crust 1. darker 2. thicker 3. lower 4. younger
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6 ! Phase changes: water Added heat goes towards phase change (or T increase if phase is not changing)
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7 Phase diagram for mixture of two minerals (salt and water) Melt occurs at lower temperature than either pure component Phase diagram for two minerals (feldspars)
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8 Red = bulk composition
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This note was uploaded on 02/08/2011 for the course EAS 1601 taught by Professor Lynch during the Spring '08 term at Georgia Institute of Technology.

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Lecture_10_Crust-1 - The Earths Crust C h a r a c te r is...

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