Metamorphic RocksMetamorphic Rocks

What is a metamorphic rock?

What is a metamorphic rock?

Rock formed from other rocks as a result of intense heat, pressure, or chemical processes.

There are two types of metamorphism, contact and regional.

Contact MetamorphismContact Metamorphism Occurs when magma

comes into contact with rocks.

Only rocks extremely close or touching the magma are affected.

The heat from the magma can change the structure and mineral composition.

Regional MetamorphismRegional Metamorphism Caused by the

movement of 1 tectonic plate against another.

This friction causes extreme heat and pressure that can change a rock’s structure and mineral composition.

Occurs over wide areas.

Metamorphic RocksMetamorphic Rocks

1. Cascade Peak held up by Cascade River Schist on the middle left.

2. Next right is Mixup Mountain, carved from Magic Mountain Gneiss.

3. Eldorado Peak underlain by the Eldorado Orthogneiss is on the skyline, left.

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FoliationFoliation Foliation is layering within a metamorphic rock. Foliation is caused by heat and pressure.

Common Foliated RocksCommon Foliated Rocks

Schist

Gneiss

Slate

Common non-foliated Rocks

Common non-foliated Rocks

Marble

Quartzite

Anthracite Coal

Parent Rock Metamorphic

Parent Rock Metamorphic

SandstoneGraniteLimestoneShaleBituminous Coal

QuartziteGneissMarbleSlate or SchistAnthracite Coal