Metamorphic rocks

CJ MacKay

Jefferson vivanco

Metamorphism

The process of forming metamorphic rocks within the lithosphere, making the rocks more dense and less porous.

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Metamorphic rock

Are formed from existing rock (sedimentary, igneous, metamorphic) by the action of heat, pressure, and chemicals.

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Parent rocks

• The parent rock is the rock that is metamorphosed

Texture

• Non foliation

• Foliation

Foliation

• gives the appearance of parallel light and dark bands,or is simply a platy or flaky texture

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Non Foliation

• display a massive texture, caused by the recrystallization of the crystals that were present in the relatively homogenous parent rock from which they were formed

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Recrystallization

• is the process of changing the mineral composition or increasing the size of the mineral crystals with out melting

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Regional metamorphism

• When high temperatures and pressure affect large regions of earths crust, they produce large belts known as regional metamorphism

Contact Metamorphism

• When molten material, such as that in an igneous intrusion, comes in contact with solid rock.

Hydrothermal metamorphism

• When very hot water reacts with rock and alters its chemical and mineral composition.

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