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Metamorphic Rocks

A Rock Group in action…. Metamorphic Rocks. Classified according to the arrangement of the grains that make up the rocks & the minerals in them. Metamorphic rocks are nicknamed “Changing Rocks”. Why?. They are made from other rocks…. How do Metamorphic rocks form?.

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Metamorphic Rocks

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  1. A Rock Group in action… Metamorphic Rocks Classified according to the arrangement of the grains that make up the rocks & the minerals in them

  2. Metamorphic rocks are nicknamed“Changing Rocks”. Why? They are made from other rocks…

  3. How do Metamorphic rocks form? From heat & pressure deep inside Earth

  4. Regional Metamorphism: Metamorphic rocks can form from Igneous, Sedimentary, or other Metamorphic rocks as they are pushed down toward the heat of the mantle.

  5. Metamorphic Rocks:Contact Metamorphism Contacting hot magma can change the surrounding rocks…

  6. Formation of Metamorphic Rocks Stage 1 Mineral Alignment Pressure Heat -Original parent rock with minerals in rock structure. (X,Y,Z).  - Rock is subject to low grade pressure & temperatures & then the minerals are flattened. x z Y x z z Y Y z x z z x x x Y

  7. x x x Y x z z z Y Y Y x Y z x Y Stage 2 Banding "Recrystallization" extreme heat & pressure allows individual crystals to… - Grow larger • Consolidate together • Separate according to density differences.  x x x x x x x x z x x z x z z z x z z z z z x z z z z Y z z Y x x Y Y Y z Y Y Y z Y Y Y Y Y Y

  8. 2 Types of Metamorphic Rock Foliated Nonfoliated “Banded” “Nonbanded”

  9. Foliated Metamorphic Rock • Definition: Grains arranged in layers or bands that split into layers • Examples: SlateSchistGneiss

  10. Original Rock New Metamorphic Rock Shale Slate Shale (sedimentary) changes to Slate when heated & squeezed by pressure.

  11. Original Rock  New Metamorphic Rock Granite Gneiss Granite (Igneous) changes to Gneiss when heated & squeezed by pressure.

  12. Nonfoliated Metamorphic Rock • Definition: Mineral grains arranged randomly, do not split into layers • Examples: MarbleQuartzite

  13. Original Rock  New Metamorphic Rock Sandstone Quartzite When Sandstone (Sedimentary) is under extreme heat & pressure, Quartzite will form.

  14. Identification of Metamorphic Rocks

  15. Metamorphism Scale Increasing Depth, Pressure & Temperature

  16. Uses of Metamorphic Rocks • Slate: • Marble: Old fashioned chalkboards, roofs, walkways, trim on buildings *Sculptures (most famous – Lincoln Memorial in Washington D.C.) * Buildings

  17. How are the 3 rock types related?

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