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greenschist facies |
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greenschist faciesOne 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. greenschist facies [′grēn‚shist ′fā·shēz] (petrology) Any schistose rock containing an abundance of green minerals and produced under conditions of low to intermediate temperatures (300-500°C) and low to moderate hydrostatic pressures (3000-8000 bars). How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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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. |
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