Metamorphic Rocks

Metamorphic Rocks

Metamorphic Rock Features

• Foliation, the appearance of banding such as gneissic banding. Nonfoliated rocks are a single solid color.

• Rock Cleavage occurs when rocks tend to split or break along a single planar fabric caused by the intense pressure of metamorphism

• Lineation occurs when minerals within the rock become aligned in the same direction.

Multiple Choice

What metamorphic feature is being illustrated in this sample of schist.

• rock cleavage

• foliation

• lineation

Multiple Choice

This sample of marble is illustration foliation.

• True

• False

Multiple Choice

Which metamorphic feature is being illustrated by this sample of slate?

• rock cleavage

• foliation

• lineation

Metamorphism of Shale

• Under low-grade metamorphism will become slate

• Under medium-grade will become phyllite or schist

• Under high-grade will become gneiss

• Under High-T/Low-P of contact metamorphism will become Hornfels

Nonfoliated Metamorphic Rocks

• Sandstone will become Quartzite, shown here

• Limestone will become Marble

• High-grade metamorphism will create larger crystals giving these a coarse texture.

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Multiple Choice

Which of the metamorphic rocks is not created by the metamorphism of shale?

• schist

• marble

• gneiss

• slate

Metamorphism of Igneous Rocks

• Basalt will become greenstone (shown with veins) or greenschist

• Rhyolite becomes metarhyolite and then schist

• Plutonic granite becomes deformed granite or gneiss

Multiple Choice

Which of these metamorphic rocks is not made from an igneous parent rock?

• greenstone

• schist

• gneiss

• quartite

Major causes of metamorphism

• Contact metamorphism, when rock comes into close contact with a heat source such like a magma chamber

• Regional metamorphism, when stress from tectonic collisions creates large scale metamorphism

Multiple Choice

The type of metamorphism shown here that is caused by the collision of two continental plates is

• contact metamorphism

• regional metamorphism

Multiple Choice

The type of metamorphism displayed here in the Marin Headlands was caused by

• Burial

• Subduction

• Hot Fluids