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METAMORPHISM AND METAMORPHIC ROCKS • Metamorphism process by which rocks undergo changes in mineralogy, texture, or chem

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

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METAMORPHISM AND METAMORPHIC ROCKS • Metamorphism process by which rocks undergo changes in mineralogy, texture, or chem

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  1. METAMORPHISM AND • METAMORPHIC ROCKS • • Metamorphism • process by which rocks undergo changes in mineralogy, texture, or chemical composition

  2. WHERE? in the crust and mantle

  3. Metamorphic Agents: internal heat, weight of rock, horizontal pressures of deformation result in: 1. temperature 2. pressure

  4. Metamorphic Agents: (cont.) 2. pressure i. confining ii. directed 3. fluids - metasomatism

  5. Types of Metamorphism 1. Contact i. plate convergence (with subduction) ii. oceanic and continental hot spots iii. deformed mountain belts

  6. Types of Metamorphism 2. Regional i. plate subduction ii. plate convergence

  7. Types of Metamorphism 3. Hydrothermal - chemical 4. Burial 5. Dynamic or shear (cataclastic)

  8. Classification - Texture and Mineralogy 1. foliated - foliation, schistosity

  9. Classification - Texture and Mineralogy 2. non-foliated

  10. Classification - Texture and Mineralogy 3. porphyroblasts

  11. Grade of Metamorphism 1. Regional vs. Contact i. low grade to high grade

  12. Grade of Metamorphism 1. Regional vs. Contact ii. index minerals

  13. Grade of Metamorphism • 1. Regional vs. Contact • iii. metamorphic zones and facies • (1) different rocks form from different parent rocks

  14. different rocks form from grades of metamorphism

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