Metamorphic Rocks
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Metamorphic Rocks

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Metamorphic Rocks Metamorphic Rocks Presentation Transcript

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