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Metamorphism and Metamorphic Rocks

Terms to learn:

metamorphism                    protolith                differential stress
metamorphic grade             foliation                 slate
schist                                 gneiss                    contact metamorphism
regional metamorphism       blueschist

 

Topic outline:

  1. Metamorphism
  2. Factors controlling metamorphism
    1. Composition of protolith (parent rock)
    2. Heat (temperature)
    3. Pressure
      1. Types of pressure
        1. confining pressure (lithostatic)
        2. differential stress – compressive (flattening effect) or shearing
    4. Fluids - metasomatism
  3. Textural and mineralogical changes
    1. metamorphic grade
    2. Foliation
    3. progressive metamorphism
  4. Metamorphic rocks
    1. non-foliated
    2. foliated
  5. Plate tectonic occurrence
    1. Contact (thermal)
    2. Regional (dynamothermal)
    3. Blueschist metamorphism

 

Interesting places to visit:

General info: http://www.mhhe.com/earthsci/geology/mcconnell/rocks_and_minerals/meta.htm

 

When you are finished with this topic, you should be able to answer these questions:

  1. What are the major agents of metamorphism and what role do they play?
  2. What information does foliation provide about the conditions of formation of the rock?
  3. What P-T paths do each of the types of metamorphism follow (i.e. contact, regional, and blueschist)?
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