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10 Cards in this Set
- Front
- Back
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Types of Metamorphism |
Contact, regional,, metasomatism |
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Contact metamorphism |
Pre-existing rock gets "baked" under relatively low pressures from magma cooling underneath it - forms an "aureole" in adjacent rock |
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Regional Metamorphism |
Pre-existing rock is subjected to heat and pressure on a regional scale - can result in different "grades" of metamorphism" Rocks get squeezed closer and closer together as the tectonics plates get closer and closer (associated with mountain building) |
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Foliation |
In response to pressure, platy minerals line up If pressure is uniform, platy minerals don't align |
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Granoblastic texture |
Non-foliated |
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types of granoblastic rocks |
Quartzite, marble |
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Metasomatism |
Occurs when fluids react with pre-existing rock and alter chemical composition - sometimes the fluid even gets involved in the rock |
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Example of Metasomatism |
Olivine + H2O -> Serpentine |
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Highest to lowest grade of metamorphism |
Slate -> Phyllite -> Schist -> Gneiss |
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Fossils in Metamorphic Rock? |
Fossils are often obliterated or deformed |
