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3 4 metamorphic rocks form as existing rocks change n.
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3.4 Metamorphic rocks form as existing rocks change

3.4 Metamorphic rocks form as existing rocks change

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3.4 Metamorphic rocks form as existing rocks change

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  1. 3.4 Metamorphic rocks form as existing rocks change

  2. Classifying Rocks • 3 rock types • Sedimentary • Igneous • Metamorphic

  3. Metamorphism • The process by which existing rock is changed by pressure or heat

  4. Metamorphic Rocks • “change” • Igneous and sedimentary rocks that have changed due to heat and pressure • Heat and pressure cause new combinations or new crystals to form • **heating and cooling of in mantle layer may lead to this formation

  5. Metamorphic

  6. Parent Rock • The original rock went through metamorphism. (the rock changed) • Ex: igneous rock and sedimentary rock “melting” together to form this new metamorphic rock) • A metamorphic rock CAN be a parent to another metamorphic rock • One rock, “melting” and turning into another

  7. Changes in Metamorphism • Rocks may flatten and pushed together • Rocks may “melt” together to form new rocks

  8. Recrystallization • The process by which bonds between atoms in minerals break and re-form in new ways during metamorphism

  9. Bands in Rocks • Foliation: the arrangement of minerals in flat or wavy parallel bands. • Found in rocks made of 2 or more minerals

  10. Foliated metamorphic rocksSlate Gneiss

  11. Nonfoliated Rock • Metamorphic rock without foliation (bands/stripes) • Primarily made of 1 mineral • Not subject to high pressure

  12. Non foliated metamorphic RocksMarble Quartzite

  13. Brain Pop http://www.brainpop.com/science/earthsystem/typesofrocks/preview.weml

  14. Discussion • What is metamorphism? • It is any process that affects the structure or composition of a rock in a solid state as a result of changes in temperature, pressure, or the addition of chemical fluids. • Under what conditions do metamorphic rocks form? • Metamorphic rocks can form due to changes in temperature and pressure.

  15. Discussion • What type of metamorphic rock has layers? • Foliated metamorphic rock has layers (stripes).

  16. Challenge • Refer to book… • Compare and contrast contact metamorphism and regional metamorphism. • Contact metamorphism occurs where magma comes in contact with parent rock. Regional metamorphism occurs over a much larger area and results from increases in pressure and temperature and chemical fluids.