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Geology metamorphic basics
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- 1Geology- MetamorphicsIs the change of rock mineralogy and texture though heat ans pressure in an essentially solid state.
- 2Contact MetamorphismHigh heat, low pressure are usually found around igneous intrusions.
Index mineral- Andalucite - 3Dynamic metamorphismHigh pressure/ low heat, occurs along thrust faults and along subduction zones
- 4Regional MetamorphismHigh heat plus high pressures, occurs along subduction zones and orogenies, All show directional pressure though foliation. Index mineral- Sillimaite
- 5Non foliated textures (no pressure- contact or thermal)Spotted rocks- produced by partial recrystallization of minerals that form spots.
Porphyroblastic- may show foliation but may not as it is large crystals surrounded by smaller ones.
Granoblastic- interlocking equal grained crystals
Sugary- granoblastic but for marble - 6Foliated Textures (regional)Produced by minerals that are platy in shape (e.g micas) and needle shaped (e.g hornblende) and that are under directional pressure. Types are Slatey cleavage, phylilitic texture, Schistose texture, Gneissose texture.
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- Fichas sobre Geology metamorphic basics , creado por holliebishop1996 el 05/03/2014.
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