Archean - Archean History of Minnesota (3.65-2.5 Ga)...

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Archean History of Minnesota (3.65-2.5 Ga)
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Distribution of Archean Bedrock in Minnesota
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First continental crust forms ~3.6 Ga Minnesota River Valley Gneisses Montevideo Gneiss
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Formation of Metamorphic Rocks Pressure/Temperature conditions of metamorphism Contact and regional metamorphism Plate tectonic setting of regional metamorphism Contact metamorphism Metamorphic intensity and metamorphic rock types Shields of continents
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P/T Conditions of Metamorphism Contact and Regional
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Contact Metamorphism
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Plate Tectonic Setting of Regional Metamorphism
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Foliation (layering in regional metamorphic rocks) Requires pressure for formation Obscures original structures in the parent rock, such as bedding Forms when new minerals crystallize perpendicular to the directed pressure
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Metamorphic Intensity and Metamorphic Rock Types
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Shields of Continents
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Arrowhead Region, NE MN
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This note was uploaded on 04/17/2008 for the course GEOS 120 taught by Professor Meyers during the Spring '05 term at Winona.

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Archean - Archean History of Minnesota (3.65-2.5 Ga)...

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