Identifying Metamorphic Rocks (PPT)
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Transcript of Identifying Metamorphic Rocks (PPT)
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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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Bands Layers
Banding vs. Layers
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Schistose foliation- minerals have been squashed into flakes of mica.
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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
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