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Metamorphic Rocks

Metamorphic Rocks

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Metamorphic Rocks

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  1. Metamorphic Rocks • What is a metamorphic rock? • Rocks, either igneous, sedimentary, and/or metamorphic, that have been changed in size, shape, texture, and even mineralogy by the application of heat, pressure, and chemically active fluids.

  2. Metamorphic Rocks

  3. Metamorphic Rocks

  4. Metamorphic Rocks • The precursor to a metamorphic rock (what the rock type was before metamorphism) is known as the protolith.

  5. Metamorphic Rocks • How are metamorphic classified? • Foliated - Parallel surfaces or apparent layers of minerals. • Non-foliated - The rock lacks any apparent layering.

  6. Metamorphic Rocks

  7. Environments of Metamorphism Contact metamorphism - this is usually localized and occurs when magma comes into contact with surround rock. The rock surrounding the magma gets heated and changed.

  8. Environments of Metamorphism

  9. Environments of Metamorphism Regional Metamorphism - occurs over a large area on the continents and is associated with mountain building epochs.

  10. Environments of Metamorphism

  11. Environments of Metamorphism

  12. Environments of Metamorphism • Dynamic Metamorphism - occurs in fault zones and is the result of tectonic movement.

  13. Environments of Metamorphism • Rifting Metamorphism - metamorphism associated with tectonic rifting events. • Mid-Ocean Ridges - metamorphism through heat and hot water at mid-ocean ridges. • Subduction Zone - The creation of blueschists, which are rare rocks.

  14. Environments of Metamorphism

  15. Environments of Metamorphism