Definitions for metamorphic facies
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A metamorphic facies is a set of metamorphic mineral assemblages that were formed under similar pressures and temperatures. The assemblage is typical of what is formed in conditions corresponding to an area on the two dimensional graph of temperature vs. pressure. Rocks which contain certain minerals can therefore be linked to certain tectonic settings, times and places in geological history of the area. The boundaries between facies, are wide, because they are gradational and approximate. The area on the graph corresponding to rock formation at the lowest values of temperature and pressure, is the range of formation of sedimentary rocks, as opposed to metamorphic rocks, in a process called diagenesis.
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"metamorphic facies." Definitions.net. STANDS4 LLC, 2014. Web. 21 Sep. 2014. <http://www.definitions.net/definition/metamorphic facies>.