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Metamorphic Rocks

Metamorphic Rocks. Metamorphic rocks have been changed from a pre-existing rock. Caused by extreme heat and/or pressure. Regional Metamorphism. Caused by extreme pressure and heat. Happens over wide “regions”. Contact Metamorphism. Caused by contact with extreme heat.

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Metamorphic Rocks

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  1. Metamorphic Rocks

  2. Metamorphic rocks have been changed from a pre-existing rock. • Caused by extreme heat and/or pressure.

  3. Regional Metamorphism • Caused by extreme pressure and heat. • Happens over wide “regions”.

  4. Contact Metamorphism • Caused by contact with extreme heat.

  5. Meta. rocks will often have foliation or a distorted structure.

  6. Distorted Structure

  7. Foliation is a “grain” to the rock.

  8. Types of Foliation: • Gneissic Foliation- minerals are squished into bands. “Zebra Stripes”

  9. Banding vs. Layers Bands Layers

  10. Schistose foliation- • minerals have been squashed into flakes of mica.

  11. A Piece of Schist

  12. Holey Schist

  13. Slaty foliation- • Rock splits into flat, thin layers.

  14. Take out your Handy Dandy Earth Science Reference Tables Page 7.

  15. Slate + + = Phyllite

  16. Phyllite + + = Schist

  17. Schist + + = Gneiss

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