metamorphism and metamorphic rocks •metamorphism process by which rocks undergo changes in...
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METAMORPHISM AND METAMORPHIC ROCKS •Metamorphism process by which rocks undergo changes in mineralogy, texture, or chemical composition. WHERE? in the crust and mantle. Metamorphic Agents : internal heat, weight of rock, horizontal pressures of deformation result in: 1.temperature - PowerPoint PPT PresentationTRANSCRIPT
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METAMORPHISM AND
METAMORPHIC ROCKS
• Metamorphism
process by which rocks undergo changes in mineralogy, texture, or chemical composition
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WHERE? in the crust and mantle
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Metamorphic Agents: internal heat, weight of rock, horizontal pressures of deformation result in:
1. temperature
2. pressure
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Metamorphic Agents: (cont.)
2. pressure
i. confining
ii. directed
3. fluids - metasomatism
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Types of Metamorphism
1. Contact
i. plate convergence (with subduction)
ii. oceanic and continental hot spots
iii. deformed mountain belts
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Types of Metamorphism
2. Regional
i. plate subduction
ii. plate convergence
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Types of Metamorphism
3. Hydrothermal - chemical
4. Burial
5. Dynamic or shear (cataclastic)
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Classification - Texture and Mineralogy
1. foliated - foliation, schistosity
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Classification - Texture and Mineralogy
2. non-foliated
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Classification - Texture and Mineralogy
3. porphyroblasts
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Grade of Metamorphism
1. Regional vs. Contact
i. low grade to high grade
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Grade of Metamorphism
1. Regional vs. Contact
ii. index minerals
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Grade of Metamorphism
1. Regional vs. Contact
iii. metamorphic zones and facies
(1) different rocks form from different parent rocks
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different rocks form from grades of metamorphism