Metamorphic Rocks

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These are usually Sedimentary or Igneous rocks that have been heated and / or squashed by very large amounts.

This can happen by one of the following:

Mainly Pressure

Major Earth movements, such as Earthquakes  - called Regional Metamorphism eg. Gneiss (photo below).

Mainly Heat

Being close to an Igneous intrusion [ see Igneous rocks section ] – called Contact Metamorphism eg. Schist (photo below).

Gneiss

Gneiss.jpg (56108 bytes)

 

Schist

Shist.jpg (86380 bytes)

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