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Metamorphic Rock

Metamorphic Rock. “Changed” rock that forms deep under the Earth. Texture and composition of a sedimentary or igneous or other metamorphic rock gets changed by heat and pressure. HOW?. Rock gets close to magma This is called CONTACT metamorphism. Also.

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Metamorphic Rock

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  1. Metamorphic Rock

  2. “Changed” rock that forms deep under the Earth • Texture and composition of a sedimentary or igneous or other metamorphic rock gets changed by heat and pressure

  3. HOW? • Rock gets close to magma • This is called CONTACT metamorphism

  4. Also . . . • Enormous pressure when the Earth’s crust collides • Called REGIONAL Metamorphism

  5. Gneiss( say ‘nice’ !)

  6. Minerals Change… • Calcite, Quartz and Hematite change into GARNET

  7. Textures: • Foliated mineral grains banded, aligned • Nonfoliatedminerals crystals are larger, not aligned; they appear shiny

  8. Examples… • Foliated: slate, schist, gneiss

  9. Slate

  10. Schist http://flexiblelearning.auckland.ac.nz/rocks_minerals/rocks/schist.html

  11. Gneiss http://flexiblelearning.auckland.ac.nz/rocks_minerals/rocks/gneiss.html

  12. Nonfoliated • Marble, • quartzite (is very common)

  13. Marble

  14. Quartzite

  15. Learn these changes • Shale  slate  gneiss • Limestone  marble • Sandstone  quartzite • Coal  Anthracite Coal

  16. Homework  Visit: http://www.es.ucl.ac.uk/schools/Glossary/rocks.htm

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