Metamorphism
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 A metamorphic aureole in the Henry Mountains, Utah. The greyish rock on top is the igneous intrusion, consisting of porphyritic granodiorite from the Henry Mountains laccolith, and the pinkish rock on the bottom is the sedimentary country rock, a siltstone. In between, the metamorphosed siltstone is visible as both the dark layer (~5cm thick) and the pale layer below it. |
Metamorphism is the solid-state recrystallization of pre-existing rocks due to changes in physical and chemical conditions, primarily heat, pressure, and the introduction of chemically active fluids. Mineralogical, chemical and crystallographic changes can occur during this process. Changes at or just beneath Earth's surface due to weathering and/or diagenesis are not classified as metamorphism.
- See also: Wikipedia
- Related: Geothermobarometry, Metamorphic rock, Metasomatism
| James Madison University: Metamorphism James Madison University: Metamorphism csmres.jmu.edu/geollab/Fichter/MetaRx/MetaKind.html - Web |
| BARROVIAN METAMORPHISM: Brock Univ. BARROVIAN METAMORPHISM: Brock Univ. www.brocku.ca/earthsciences/people/gfinn/petrology/barrow1.htm - Web |
| Metamorphism of Carbonate Rocks: University of Wis... Metamorphism of Carbonate Rocks: University of Wisconsin - Green Bay www.uwgb.edu/dutchs/PETROLGY/barrcarb.HTM - Web |
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