metamorphic rocks
DESCRIPTION
METAMORPHIC ROCKS. What is a metamorphic rock? Metamorphic rocks form after another rock is subjected to extreme heat and/or pressure and that changes its physical characteristics. Metamorphic Rocks Appear Similar to Their Parent Rocks - PowerPoint PPT PresentationTRANSCRIPT
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METAMORPHIC ROCKS
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What is a metamorphic rock? Metamorphic rocks form
after another rock is subjected to extreme heat and/or pressure and that changes its physical characteristics
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Metamorphic Rocks Appear Similar to Their Parent Rocks A metamorphic rock will
often resemble the rock it transformed from (parent rock)
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Where does the heat and pressure come from? Heat and pressure can
originate from Earth’s internal heat, weight of rocks above, and folding in mountain building
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How does the rock change? Minerals recrystallize or
deform
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Textures of Metamorphic Rocks Foliated Nonfoliated
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Foliated Metamorphic Rocks Mineral grains have
aligned due to heat and direct pressure
Sometimes the minerals are so aligned, they form bands in the rock, this is known as banding
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Nonfoliated Metamorphic Rocks Mineral grains are heated
and compressed usually to a higher density
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2 Types of Metamorphism Regional Local
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Regional Metamorphism Metamorphism of rocks
over a large area due to pressure, common in folded mountains
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Local Metamorphism Metamorphism of rocks
over a smaller area due to contact with magma
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