epidote amphibolite facies

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

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