Fig. A high-, intermediate-, ar low-pressure-facies … The epidote–amphibolite facies. 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. Where possible, the greenschist-facies and the epidote-arnphibolite- and arnphibolite-facies groups are divided into three facies series based on pressure. 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. greenschist facies (GNS); and (3) epidote-amphibolite and arnphibolite facies (AMP). Amphibolite; Amphibolite is a coarse-grained metamorphic rock, predominantly composed of mineral amphibole and plagioclase feldspar. the field of chlorite stability in metapelites, while. Temperature-pressure diagram Greenschists, as their name implies, tend to be green. It has parallel extinction relative to its usual long crystal dimension (the b direction), but inclined excinction, looking down b relative to its { … Width of sample 11 cm. 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. Arendal, Norway. Equivalent to Eskola's epidote-amphibolite facies, it is of uncertain status, transitional between the greenschist facies and the amphibolite facies. The assemblage of epidote with pink K-feldspar and quartz is also known as unakite. The most common metamorphic facies in mountain belts are the greenschist and the higher-temperature amphibolite facies. Muscovite ( Si:Al> 3:1 ) b. Amphibolite Facies: This facies is … is a region of sta-bility of the staurolite-bearing mineral assemblages in. Greenschist facies: chlorite + epidote + albite (actinolite, biotite) Amphibolite facies: plagioclase + hornblende (epidote, garnet, orthoamphibole, cummingtonite) Granulite facies: orthopyroxene + plagioclase (clinopyroxene, hornblende, garnet) minerals present in this facies gives the name to this facies. Basic rocks metamorphosed to the amphibolite facies are amphibolites, containing mostly hornblende and plagioclase. This mineral occurs mostly in various metamorphic rocks (greenschist and amphibolite facies), but it may also crystallize directly from felsic magma. 25.2. Epidote is the term for the optically negative, high birefringence Al-Fe 3+ epidote, and is the most common epidote type. Epidote in an epidote–amphibolite facies basaltic rock. The mineral assemblages of green-schist facies include chlorite, chloritoid, epidote, actinolite, muscovite, albite (anorthite< 7% ) and quartz. The set of metamorphic mineral assemblages (facies) in which basic rocks are represented by hornblende + albite + epidote.

epidote amphibolite facies

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