5.4 metamorphic rock
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Formation of Metamorphic Rock
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Formation of Metamorphic Rock
• Changed from one type of rock into another by heat, pressure, and chemical processes.
• Form deep beneath the earth’s surface.
• ALL metamorphic rocks are formed from existing igneous, sediment or metamorphic rocks.
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Formation
• Minerals may change in size or shape or separate into parallel bands.
• Metamorphic formation happens two different ways–Contact metamorphism–Regional metamorphism
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Contact Metamorphism
• Formed when magma pushes through existing rock.
• Changes the structure and mineral composition of surrounding rock.
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Regional Metamorphism
• Metamorphism sometimes occurs with tectonic plate movement.
• Tremendous heat and pressure is created at plates edge.
• This heat and pressure will cause chemical changes in the rocks.
• Most metamorphic rock is created be regional metamorphism.
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Classification of Rocks
• Rocks can be classified into two different types based on their texture:–Foliated–Nonfoliated
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