Geol111_Metamorphism2007

Geol111_Metamorphism2007 - Metamorphic Rocks...

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Metamorphic  Rocks
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Metamorphic Rocks Recrystallization in the solid state Caused by changes in T, P or   fluids New environment = new minerals Growing minerals create a new  texture
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Sources of metamorphic  change
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Metamorphism Recrystallization T, P or change in pore fluids initiate   change in the mineral assemblage Reaction occur entirely in the  solid state Shale Schist
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Textural changes occur during  metamorphism New minerals grow during  metamorphism Precursor rock textures are modified
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Protolith The  parent  rock subjected to Metamorphism -can be any rock type:   igneous sedimentary , or  metamorphic Shale Schist
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Protolith
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Origin of Metamorphic Rocks Metamorphism         Temperature exceeds  200OC    Pressure exceeds  300 M Pa  (approx.  10,000 ft deep) Metamorphism ends when melting  begins   Melting begins at ~700oC
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Stability ranges for Al2 SiO5  minerals
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Source of heat
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Geol111_Metamorphism2007 - Metamorphic Rocks...

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