Metamorphic Rocks.

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Presentation transcript:

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.

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

Distorted Structure

Foliation is a “grain” to the rock.

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

Banding vs. Layers Bands Layers

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

A Piece of Schist

Holey Schist

Slaty foliation- Rock splits into flat, thin layers.

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

Slate + + = Phyllite

Phyllite + + = Schist

Schist + + = Gneiss