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Marble from Carrara, Italy

Metamorphic rocks form when the crust is exposed to rising pressure and temperature conditions. What processes can raise the pressure and temperature of the crust?. Metamorphic Rocks Are Composed of Sedimentary, Igneous, or Metamorphic Minerals that Have Recrystallized.

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Marble from Carrara, Italy

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  1. Metamorphic rocks form when the crust is exposed to rising pressure and temperature conditions. What processes can raise the pressure and temperature of the crust?

  2. Metamorphic Rocks Are Composed of Sedimentary, Igneous, or Metamorphic Minerals that Have Recrystallized. Marble from Carrara, Italy

  3. What Is Metamorphic Rock? • Pre-existing sedimentary, igneous, or metamorphic rock changed to a new assemblage of minerals. • Result of solid-state recrystallization of “parent rock” due to changing crustal conditions.

  4. Rocks Evolve through a Sequence of Metamorphic Grades …

  5. … conveniently “indexed” by IndexMinerals

  6. Regional Metamorphism = stress = foliation

  7. Foliated texture is produced by directed stress related to regional metamorphism Shale is parent rock (protolith)

  8. Slate Fractures along parallel planes. Schist- parallel to sub-parallel arrangement. Gneiss Minerals segregated into bands. PhylliteParallel mineral arrangement.

  9. Contact Metamorphism = thermal

  10. Limestone changed by contact metamorphism into marble and various types of minerals Contact metamorphism forms Quartzite Hornfels Marble

  11. Marble Hornfels Metaconglomerate Quartzite Anthracite Nonfoliated rocksmay develop during regional or contact metamorphism

  12. In addition to heat and pressure, chemically active fluids transport heat and promote recrystallization

  13. Identify where you would find metamorphic rocks and their type.

  14. Igneous Granite/Rhyolite Diorite/Andesite Gabbro/Basalt Peridotite (Komatite) Metamorphic Slate Phyllite Schist Gneiss Hornfels Marble Quartzite Plate Movement Powers the Rock Cycle Sedimentary Conglomerate/Breccia Sandstone Shale Limestone Coal

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