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Metamorphic Rock

Metamorphic Rock. Chapter 2 Section 4. Metamorphism Metamorphic rocks. comes from the Greek words meta, which means “changed,” and morphos , which means “shape.” are rocks in which the structure, texture, or composition of the rock have changed. Origins of Metamorphic rock.

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Metamorphic Rock

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  1. Metamorphic Rock Chapter 2 Section 4

  2. Metamorphism • Metamorphic rocks • comes from the Greek words meta, which means “changed,” and morphos, which means “shape.” • are rocks in which the structure, texture, or composition of the rock have changed.

  3. Origins of Metamorphic rock • If the environment changes to include heat and pressure the rock will undergo metamorphism • Metamorphism takes place between 50℃ and 1,000℃.

  4. Contact Metamorphism • Regional Metamorphism • Rock is heated by near by magma and changes it to other minerals and takes place at igneous intrusions. • When pressure builds up in rock that is buried deep below other rock formations or when large pieces of the Earth’s crust collide with each other

  5. Composition of Metamorphic Rock

  6. index minerals • Foliated Metamorphic Rock • Used to estimate the temperature, depth, and pressure at which a rock undergoes meta morphism • The texture of metamorphic rock in which the mineral grains are arranged in planes or bands

  7. Nonfoliated Metamorphic Rock • recrystallization • The texture of metamorphic rock in which the mineral grains are not arranged in planes or bands • made of one or only a few minerals • During metamorphism, the crystals of these minerals may change in size or the mineral may change in composition

  8. Deformation • change in the shape of a rock caused by a force placed on it

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