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Metamorphic. Metamorphic (means to change ) formed from changes in igneous, sedimentary or other metamorphic rocks. Metamorphic Rocks. Metamorphic rocks have changed form due to temperature and pressure increases or they undergo changes in the composition of a metamorphic rock.

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metamorphic
Metamorphic
  • Metamorphic (means to change) formed from changes in igneous, sedimentary or other metamorphic rocks.
metamorphic rocks
Metamorphic Rocks
  • Metamorphic rocks have changed form due to temperature and pressure increases or they undergo changes in the composition of a metamorphic rock.
what causes metamorphic rocks two processes
What causes metamorphic rocks?Two processes…..
  • Heat and pressure is involved in both of these processes.
contact metamorphism
Contact Metamorphism
  • heated by nearby magma
  • Increased temperature changes the composition of the rock, minerals are changed into new minerals

Hornfels is a fine-grained non-foliated metamorphic rock produced by contact metamorphism

http://www.windows.ucar.edu/tour/link=/earth/geology/meta_contact.html&edu=h igh&fr=t

regional metamorphism
Regional Metamorphism
  • pressure builds up in rocks that is deep within the Earth
  • Large pieces of the Earth’s crust collide and the rock is deformed and chemically changed by heat and pressure

http://www.windows.ucar.edu/tour/link=/earth/geology/meta_regional.html&edu=high&fr=t

classification of metamorphic rocks
Foliated

Non- foliated

Classification of Metamorphic Rocks

http://itc.gsw.edu/faculty/bcarter/physgeol/metrx/pmarble.JPG

foliated
Foliated
  • They have layers of colored bands
  • Or layers of mineral alignment but no colors are visible
  • Foliated rocks include slate, schist, gneiss.
non foliated
Non-foliated
  • They do not have layers or colored bands.
  • Usually this type of rock only has one type of mineral.
  • Non-foliated rocks include marble and quartzite.