GeoClassroom Physical Geology Historical Geology Structure Lab Mineralogy Petrology


  1. Regional Metamorphism

    • Corresponds to progressive changes, increases, in Temperature & Pressure, due to burial.
    • Commonly this type of metamorphism is associated with orogenic events and processes.
    • Regionally metamorphosed rocks occur in very large belts, 10 - 100's km wide by 100 - 1000's km long.
      • Within each belt will be preserved at least one thermal axis, representing the maximum temperature of metamorphism within the belt.
      • Temperatures will increase towards the thermal axis.
      • Associated granitic and/or ultramafic masses intruded into the terranes generally, but not always near the thermal axis.
  2. Contact Metamorphism

    • Recrystallization, production of metamorphic mineral assemblages, within the contact aureole surrounding an intrusive body
    • Generally held that P remains constant and metamorphism results from temperature increase, due to conduction of heat away from intrusive.
  3. Pyro Metamorphism

    • Recrystallization at high temperature of xenolith fragments in volcanic rocks or small intrusions;
    • Melting of the xenolith may occur.

  4. Hydrothermal Metamorphism

    • Recrystallization associated with and influenced by a hydrothermal solution.
  5. Cataclastic Metamorphism

    • Crushing or grinding of rocks as a result of fault movement.

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