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Metamorphic rocks


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Metamorphic rocks

  1. 1. Metamorphic Rocks By Sherry Wu and Tiffany Shien
  2. 2. What are metamorphic rocks? <ul><li>Metamorphic rocks are rocks that forms when heat and pressure squeezes sedimentary rocks. Examples of metamorphic rocks include marble, quartzite, slate, schist, phyllite, gneiss. </li></ul>
  3. 3. Contact Metamorphism <ul><li>Contact metamorphism is a process involving low and moderate pressure and heat. Contact metamorphism occurs near igneous intrusions. </li></ul>
  4. 4. Regional Metamorphism <ul><li>Regional metamorphism is a process involving both heat and directed pressure. It occurs over thousands of cubic kilometers deep within the earth’s crust. </li></ul>
  5. 5. Texture of Metamorphic Rocks <ul><li>All metamorphic rocks has one of two textures </li></ul><ul><li>Foliated: the texture of metamorphic rock in which the mineral grains are arranged in planes or bands. </li></ul><ul><li>Nonfoliated: the texture of metamorphic rock in which the mineral grains are not arranged in planes or bands. </li></ul>
  6. 6. Foliated Metamorphic Rocks <ul><li>Foliated metamorphic rock usually contains aligned grains of flat minerals. Metamorphic rocks can become other metamorphic rocks if the environment changes again. </li></ul><ul><li>For example: when shale is exposed to slight heat and pressure, they change into a foliated metamorphic rock called slate. If slate is exposed to more heat and pressure, they can change into phyllite. And if phyllite is exposed to heat and pressure again it can change into schist. If metamorphism continues, more heat and pressure can cause minerals to separate into distinct bands in a metamorphic rock called gneiss. </li></ul>
  7. 7. Nonfoliated Metamorphic Rock <ul><li>Nonfoliated metamorphic rock like marble and quartzite don’t have a lack of aligned mineral grains. During metamorphism, the crystals of these minerals may change in size or the mineral may change in composition in a process called recrystallization. </li></ul>
  8. 8. Metamorphic Rock Structures <ul><li>Features in metamorphic rocks that tell you about its history is caused by deformation. Deformation is a change in the shape of a rock caused by a force placed on it. </li></ul>