8_Metamorphism[1]

8_Metamorphism[1] - Increasing Metamorphic Grade: General...

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1 Metamorphic Rocks Changes in the Solid State Agents of Metamorphism? Agents of Metamorphism • Heat – from where? • Pressure – lithostatic or differential • Fluids – from where? • All can work over a period of time
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2 Geothermal Gradient Cascades Basin and Range (Nevada)
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3 Iowa Lithostatic Stress Results in Uniform Strain
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4 DIFFERENTIAL COMPRESSIONAL STRESS DIFFERENTIAL COMPRESSIONAL STRESS
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5 DIFFERENTIAL SHEAR STRESS Mineral Formation: Hydrothermal/Crystallize from Solution
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6 Mineral Formation: Hydrothermal/Crystallize from Solution Types of Metamorphism shock regional contact / hydrotherma dynamic (fault) burial seafloor / hydrothermal contact metamorphism baking
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7 contact metamorphism hydrothermal alteration dynamic metamorphism mylonites
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8 shock metamorphism regional metamorphism
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9 regional metamorphism
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10 • Increases foliation • Increases grain size
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Unformatted text preview: Increasing Metamorphic Grade: General Trends Changes mineral composition Drives off water and other volatiles 11 foliated Grains Align In Response to Stress to form Foliated Texture Grains Deform In Response to Stress to form Foliated Texture 12 granite (parent rock) gneiss (foliation =light, dark bands) metamorphose schist (50% platy, elongated minerals = schistose texture) slate (fine-grained; flat plates) 13 Amphibolite? foliated? Amphibolite? foliated? Amphibolite weakly foliated to non-foliated 14 non-foliated 15 Non-foliated Non-Foliated Metamorphic Rocks Greenstone Non-foliated 16 Metamorphism and Plate Tectonics Metamorphism and Plate Tectonics Natural Resources Associated with Metamorphic Rocks??...
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8_Metamorphism[1] - Increasing Metamorphic Grade: General...

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