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amphibolite facies |
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amphibolite faciesOne of the major divisions of the mineral facies classification of metamorphic rocks, encompassing rocks that formed under conditions of moderate to high temperatures (950°F, or 500°C, maximum) and pressures. Less-intense temperatures and pressures form rocks of the epidote-amphibolite facies, and more-intense temperatures and pressures form rocks of the granulite facies. Amphibole, diopside, epidote, plagioclase, certain types of garnet, and wollastonite are minerals typically found in amphibolite facies rocks. They are widely distributed in Precambrian gneisses and probably formed in the deeper parts of folded mountain belts. |
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? Mentioned in | ? References in periodicals archive | |
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The supracrustal rocks are
generally metamorphosed to amphibolite facies, less commonly to
granulite facies, and rarely to greenschist facies. The Emily gold showing comprises gold
mineralization in leucogabbro, associated with disseminated pyrrhotite
and arsenopyrite in upper amphibolite facies, deformed gneisses of the
Early Proterozoic Kisseynew gneiss belt. The belt hosts a major northeast trending regional structure with
a strike length in excess of 200 kilometres, and is comprised of a
sequence of Birimian upper greenschist to amphibolite facies metamorphic
rocks and locally foliated metasedimentary (CME,1997) with minor
metavolcanic rocks. |
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amphibolite facies
