Metamorphic Rocks 2011acloutier copyright

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Earth & Space Science
Geology Unit
Annie Cloutier
2011

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Metamorphic Rocks 2011acloutier copyright

  1. 1. Metamorphic Rocks by Annie Cloutier copyright 2011
  2. 2. <ul><li>Pressure and heat increase with depth </li></ul><ul><li>Pressure and heat inside the Earth cause the changes to occur in rock </li></ul><ul><li>Where does the heat come from ? </li></ul><ul><li>Earth generates heat from the radioactive core </li></ul><ul><li>working its way up to the lithosphere </li></ul>Metamorphic Greek word origin meta means “change” morph means “form”
  3. 3. Two Types of Metamorphic Groups <ul><li>Regional metamorphism > when high temperatures and pressure affect large regions of Earth’s crust belts of metamorphic rock happen </li></ul><ul><li>Contact metamorphism > when molten rock comes in contact with solid rock, large scale minerals change with little deformation </li></ul>
  4. 4. Regional Metamorphism
  5. 5. Contact metamorphism
  6. 6. Cause & Effect of Metamorphism
  7. 7. Hydrothermal Metamorphism when very hot water reacts with rock and alters its chemistry and mineralogy
  8. 8. Getting into hot water can be good <ul><li>hydrothermal fluids invade the surrounding rocks and change their mineralogy, textures and chemistry </li></ul><ul><li>valuable ore deposits of gold , copper, silver, tungsten and lead are formed this way </li></ul>
  9. 9. Two Textures of Metamorphic Rocks <ul><li>foliated </li></ul><ul><li>wavy lines, bands, layers characterize foliated rocks; </li></ul><ul><li>often have small crystals of mineral grains, and long axis of parallel alignment </li></ul><ul><li>Schist </li></ul><ul><li>Gneiss </li></ul><ul><li>Shale </li></ul><ul><li>nonfoliated </li></ul><ul><li>usually form with blocky crystal shapes; sometimes record faint color ripple marks </li></ul><ul><li>Quartzite </li></ul><ul><li>Marble </li></ul><ul><li>Calcite </li></ul>
  10. 10. Gneiss > <ul><li>Schist > </li></ul>< Slate >
  11. 11. It’s Morphing time.. <ul><li>Metamorphic Rock </li></ul><ul><li>Gneiss < </li></ul><ul><li>Marble < </li></ul><ul><li>Slate < </li></ul><ul><li>Mica schist < </li></ul><ul><li>Parent Rock </li></ul><ul><li>Granite </li></ul><ul><li>Limestone </li></ul><ul><li>Shale </li></ul><ul><li>Mica pegmatite </li></ul>Its Morphin’ time !
  12. 12. The Rock Cycle
  13. 13. The end is not…it’s all a cycle
  14. 14. <ul><li>… but this is the end of the power point </li></ul>

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