the field of chlorite stability in metapelites, while. The assemblage of epidote with pink K-feldspar and quartz is also known as unakite. Arendal, Norway. The epidote–amphibolite facies. This mineral occurs mostly in various metamorphic rocks (greenschist and amphibolite facies), but it may also crystallize directly from felsic magma. Equivalent to Eskola's epidote-amphibolite facies, it is of uncertain status, transitional between the greenschist facies and the amphibolite facies. Greenschist facies: chlorite + epidote + albite (actinolite, biotite) Amphibolite facies: plagioclase + hornblende (epidote, garnet, orthoamphibole, cummingtonite) Granulite facies: orthopyroxene + plagioclase (clinopyroxene, hornblende, garnet) Where possible, the greenschist-facies and the epidote-arnphibolite- and arnphibolite-facies groups are divided into three facies series based on pressure. Greenschists, as their name implies, tend to be green. Basic rocks metamorphosed to the amphibolite facies are amphibolites, containing mostly hornblende and plagioclase. greenschist facies (GNS); and (3) epidote-amphibolite and arnphibolite facies (AMP). It has parallel extinction relative to its usual long crystal dimension (the b direction), but inclined excinction, looking down b relative to its { … Epidote is the term for the optically negative, high birefringence Al-Fe 3+ epidote, and is the most common epidote type. Amphibolite; Amphibolite is a coarse-grained metamorphic rock, predominantly composed of mineral amphibole and plagioclase feldspar. 25.2. Width of sample 11 cm. The mineral assemblages of green-schist facies include chlorite, chloritoid, epidote, actinolite, muscovite, albite (anorthite< 7% ) and quartz. Temperature-pressure diagram The set of metamorphic mineral assemblages (facies) in which basic rocks are represented by hornblende + albite + epidote. Epidote-amphibolite facies assemblage (plagioclase [An 24-36] + hornblende + epidote + sphene + quartz) at the Davis Mill occurrence gives way to the amphibolite assemblage (calcic plagio-clase [An 33-88] + hornblende + garnet + epidote + ilmenite + quartz) at Hudson Rapids. These amphibolites consist of an epidote–amphibolite facies assemblage of amphibole, garnet, albite, clinozoisite, paragonite, ilmenite and quartz, which is incompletely overprinted by an eclogite facies assemblage of garnet, omphacite and rutile. Muscovite ( Si:Al> 3:1 ) b. Amphibolite Facies: This facies is … The most common metamorphic facies in mountain belts are the greenschist and the higher-temperature amphibolite facies. minerals present in this facies gives the name to this facies. A high-, intermediate-, ar low-pressure-facies … is a region of sta-bility of the staurolite-bearing mineral assemblages in. Fig. Omphacite and garnet coronas around amphibole occur in amphibolites in the Hong'an area, western Dabie Mountains, China. • Albite-epidote hornfels facies correlates with the greenschist facies into which it grades with increasing pressure • Hornblende hornfels facies correlates with the amphibolite facies, and the pyroxene hornfels and sanidinite facies correlate with the granulite facies 26. Epidote in an epidote–amphibolite facies basaltic rock. Facies are amphibolites, containing mostly hornblende and plagioclase also known as unakite mineral occurs mostly in various metamorphic (. Arnphibolite-Facies groups are divided into three facies series based on pressure represented by hornblende + albite epidote... And arnphibolite-facies groups are divided into three facies series based on pressure unakite... 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