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Metamorphic Rocks

Metamorphic Rocks

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Metamorphic Rocks

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  1. Metamorphic Rocks

  2. Metamorphism of Sedimentary Rocks Sandstone: Quartzite, Metaquartzite Shale: Phyllite Slate Schist Gneiss Limestone: Marble

  3. Types of Metamorphism Contact Metamorphism: The main metamorphic agent is heat.

  4. Progression of metamorphism Start with a shale and then hit it with pressure and heat. Slate Phyllite Schist

  5. You end up with something that is really Gneiss!

  6. Introduction to Metamorphic Rocks Metamorphism is the solid-state transformation of pre-existing rock into texturally or mineralogically distinct new rock as the result of high temperature,high pressure, or both.

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

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

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

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

  11. Distorted Structure

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

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

  14. Banding vs. Layers Bands Layers

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

  16. A Piece of Schist

  17. Holey Schist

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

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

  20. Slate + + = Phyllite

  21. Phyllite + + = Schist

  22. Schist + + = Gneiss

  23. How does Metamorphism Relate to Plate Tectonics? T and P increase at collisional (convergent) plate boundaries.