Metamorphic Rocks

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

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Regional Metamorphism

• Caused by extreme pressure and heat.
• Happens over wide regions.

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Contact Metamorphism

• Caused by contact with extreme heat.

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

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Distorted Structure
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• Foliation is a grain to the rock.

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Types of Foliation

• Gneissic Foliation- minerals are squished into
  bands.

Zebra Stripes
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Banding vs. Layers
Bands
Layers
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• Schistose foliation-
• minerals have been squashed into flakes of mica.

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A Piece of Schist
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Holey Schist
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• Slaty foliation-
• Rock splits into flat, thin layers.

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

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Slate


Phyllite

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Phyllite


Schist

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Schist


Gneiss