Metamorphic Rocks

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Metamorphic Rocks

  1. 1. I. FORMATION OF METAMORPHIC ROCKS:
  2. 3. A metamorphic rock is one whose original form has been __________ changed
  3. 4. BY________ AND _____________ HEAT PRESSURE
  4. 5. THIS ALTERATION IS CALLED _____________ RE -CRYSTALLIZATION
  5. 6. These changes are NOT caused by MELTING
  6. 7. If the rock melted and cooled it would be an _____________ IGNEOUS ROCK
  7. 8. 1. Changes caused by _____________ RE - CRYSTALLIZATION (again)
  8. 9. May include the creation and growth of ________________________ NEW MINERAL CRYSTALS
  9. 10. 2. Rocks which are intensely __________ can also become ____________ rock Compressed metamorphic
  10. 13. MAKING IT MORE DENSE AND RESISTANT TO WEATHERING
  11. 14. The growth of new minerals may cause the rock to appear BANDED
  12. 15. OR STRIPES OF LIGHT DARK MINERALS foliated
  13. 16. pressure pressure pressure
  14. 17. SCHIST SHOWS BANDING
  15. 19. It can also ____________ (BEND) OR ______________ ORIGINAL STRUCTURES DESTROY DISTORT
  16. 23. 3. There are two types of Metamorphism : <ul><li>A. </li></ul><ul><li>B. </li></ul>Regional Contact
  17. 24. A.Regional metamorphism: occurs over large areas with extreme pressures & temperatures
  18. 25. Photograph of regional metamorphism New York State thruway
  19. 27. This extreme heat and pressure is what builds MOUNTAINS
  20. 28. B. CONTACT METAMORPHISM
  21. 29. IS THE _________ OF CONTACT WHERE AN IGNEOUS INTRUSION MEETS THE EXISTING ROCK BUT _____________ MELT IT ZONE DOES NOT
  22. 30. IGNEOUS INTRUSION Contact metamorphism occurs only at the place where the magma contacts rock SANDSTONE LIMESTONE SANDSTONE SHALE
  23. 31. Any kind of rock: IGNEOUS SEDIMENTARY METAMORPHIC
  24. 32. CAN UNDERGO RE-CRYSTALLIZATION TO FORM METAMORPHIC ROCK.
  25. 33. PARENT ROCK Is rock from which metamorphic rock is formed.
  26. 34. Limestone metamorphoses to become _________________ marble
  27. 35. Sandstone metamorphoses to become _________________ quartzite
  28. 36. Shale metamorphoses to become _________________ slate
  29. 37. We will not find fossils in Metamorphic rock because:
  30. 38. The heat and pressure of metamorphism would have destroyed them
  31. 39. TIME TO CHECK OUT THE REFERENCE TABLES TO LOOK AT HOW TO IDENTIFY METAMORPHIC ROCKS
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