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Granulite Facies

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granulite facies

One of the major divisions of the mineral facies classification of metamorphic rocks, encompassing rocks that formed under intense temperature-pressure conditions (higher than 950°F, or 500°C). The minerals found in the rocks of granulite facies include hornblende, pyroxene, biotite, garnet, calcium plagioclase, and quartz or olivine. See also amphibolite facies.


granulite facies [′gran·yə‚līt ′fā·shēz]
(petrology)
A group of gneissic rocks characterized by a granoblastic fabric and formed by regional dynamothermal metamorphism at temperatures above 650°C and pressures of 3000-12,000 bars.

Granulite Facies 

metamorphic rocks that formed as a result of regional metamorphism at great depths in almost anhydrous conditions. Granulite facies are represented by quartzose-feldspathic gneisses with garnets or pyroxene.



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The supracrustal rocks are generally metamorphosed to amphibolite facies, less commonly to granulite facies, and rarely to greenschist facies.
The Southwestern Group consists of cordierite granulite facies rocks made of cordierite gneisses, calc granulites, and metasediments.
This assumption was strongly based on lithological correlations of granulitic facies rocks with those of the Kola series and on an idea, famous among the Soviet geologists, that the regional granulite facies rocks should be older than their lower-grade counterparts.
 
 
 
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