metamorphic zone

A Dictionary of Earth Sciences | 1999 | 544 words | Copyright

metamorphic zone The area between two successive isograds in a metamorphic terrain. The zone is named after the lowergrade isograd (see METAMORPHIC GRADE). For example, the area lying between the garnet isograd and the kyanite isograd for pelitic rocks in a regional metamorphic terrain is termed the garnet zone. The zone defines a set of pressure, temperature, P(H₂O), and P(CO₂), over which there were no mineralogical reactions in the particular rock composition concerned. Normally, the chemical composition of pelites is used as a marker.

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AILSA ALLABY and MICHAEL ALLABY. "metamorphic zone." A Dictionary of Earth Sciences. 1999. Encyclopedia.com. 27 May. 2012 <http://www.encyclopedia.com>.

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AILSA ALLABY and MICHAEL ALLABY. "metamorphic zone." A Dictionary of Earth Sciences. 1999. Retrieved May 27, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O13-metamorphiczone.html

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