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greenschist facies

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greenschist facies

One of the major divisions of the mineral facies classification of metamorphic rocks, encompassing the rocks that formed under fairly low temperatures (480–660 °F, or 250–350 °C) and pressure conditions and usually produced by regional metamorphism. The minerals commonly found in such rocks include quartz, orthoclase, muscovite, chlorite, serpentine, talc, and epidote; carbonate minerals and amphibole (actinolite) may also be present.
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The country rock these veins crosscut is mostly basalt and andesite flows metamorphosed to lower greenschist facies and locally containing approximately 1% pyrite.
SKN Updates High Grade Silver-Gold Projects in Henan, Central China by Business Wire
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