Morgan, B. Not logged in A series of rock analyses from my field work in the Tysfjord district of Northern Norway offered the opportunity for exact calcul­ ation of a numher of horn'blende minerals, occurring more or less abundantly in some of the rocks. epidote-amphibolite facies are comparable to some HP rocks from the Hongan region of western Dabie, but differ from other HP mafic schists with cooling ages of c. 330 Ma in the Hida Mountains. When cooling from amphibolite or greenschist to lower metamorphic facies, the amphibole species hornblende breaks down to chlorite and epidote, and to the amphibole species actinolite, if free water is present (e.g., Apted & Liou, 1983; Fagereng & Diener, 2011; Miyashiro, 1968). The calculated low-pressure limit for the eclogite paragenesis pyralspite+omphacite (Jd 50%)+quartz typical metabasite compositions is 12 to 14 kbars, with H 2 O-activity=0.9 or 1.5 to 2 kbar lower for Jd 30%. the highest-temperature metamorphic domain. Peak metamorphic conditions are about 0.7 GPa (21 km depth) and 640°C. Omissions? Amphibolite-facies (MP/MT-HT) Main article: amphibolite facies. Equivalent to Eskola's epidote-amphibolite facies, it is of uncertain status, transitional between the greenschist facies and the amphibolite facies. The facies is named for zeolites, strongly hydrated tectosilicates. Following the eclogite facies metamorphism, the Tonaru mass was retrograded to the epidote amphibolite facies. FROM THE EPIDOTE-AMPHIBOLITE FACIES BY STEINAR FOSLIE With 2 figs. Below 600°C no mutual boundaries exist between the amphibolite facies and the epidote-blueschist and eclogite facies respectively. An amphibolite rich in epidote. The assemblage of epidote with pink K-feldspar and quartz is also known as unakite. Epidote Amphibolite - Mayo. ing mineral assemblages belonging to the greenschist, epidote-amphibolite, and amphibolite facies (Eskola, 1939; see also Fyfe, Turner & Verhoogen, 1958, pp. Therefore, this garnet growth and associated deformation (D1) took place during subduction up to eclogite facies conditions. A H H H D D E E E P P P P P . Fluids in equilibrium with meta-syenite and meta-granite mineral assemblages hadXHiO values of ~0-95, assumingXHlO + XCOl= 1-0. Changes in mineralogy depends very much on protolith, however, production of abundant garnet and hornblende are most characteristic. The gabbros, especially cumulate varieties, have no chlorite. Noticias Entrevista: Augusto Beléndez y su experiencia con el acceso abierto Acceso Repositorio Arias Montano en el número 100 revista PH The estimated P – T conditions are T  = 300–450°C and P  = 0.7–1.1 GPa for the epidote‐blueschist facies, and the peak P – T conditions for the eclogite facies are T  = 700–730°C and P  ≥ 1.5 GPa. New paragonite K–Ar dating for the PGEAyields a Triassic cooling event at 210 Ma that • 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. 'albite–epidote–amphibolite facies' can also refer to... albite–epidote–amphibolite facies. Other articles where Albite-epidote-hornfels facies is discussed: metamorphic rock: Albite-epidote-hornfels facies: Rocks of the albite-epidote-hornfels facies are characteristically found as the outer zones of contact aureoles where the thermal episode fades out and the rocks pass into their regional grade of metamorphism. Most notable are: FZeolite FPrehnite-pumpellyite...resulting from the work of Coombs in the “burial metamorphic” terranes of New Zealand Fyfe et al. It is named after amphiboles that form under such circumstances. It is distinguished from the greenschist facies by the presence of hornblende rather than actinolite, and from the amphibolite facies by the presence of sodic plagioclase + epidote rather than more calcic plagioclase. Therefore, faults exhuming greenschist to amphibolite facies mafic rocks can experience changes in frictional properties as mineral proportions change with increasing retrograde chlorite (+/− epidote) growth. The Tonaru epidote–amphibolite is one of the large metagabbro dominated bodies and occurs in schistose rocks of the Sanbagawa metamorphic belt, central Shikoku. Epidote-amphibolite facies, one of the major divisions of the mineral-facies classification of metamorphic rocks, the rocks of which form under moderate temperature and pressure conditions (250°–400° C [500°–750° F] and up to 4 kilobars [1 kilobar equals about 15,000 pounds per square inch]). By signing up for this email, you are agreeing to news, offers, and information from Encyclopaedia Britannica. This facies series is called the hornfels facies series or the contact facies series. Fact sheet. A series of rock analyses from my field work in the Tysfjord district of Northern Norway offered the opportunity for exact calcul­ ation of a numher of horn'blende minerals, occurring more or less abundantly in some of the rocks. Path A reaches blueschist facies but remains at depth, where it continues to heat up, reaching amphibolite facies. Essential minerals - these are minerals that are required within the classification of this rock: Epidote-bearing amphibolite The name amphibolite has been used in geological literature for nearly 200 years, since Brongniart (1813). However, in the absence of free water, faults can also accommodate exhumation of an existing amphibole‐chlorite‐epidote assemblage. Part of Springer Nature. Minerals typical of the rocks of the epidote-amphibolite facies include biotite, almandite garnet, plagioclase, epidote, and amphibole. At higher pressures, the epidote amphibolite facies lies adjacent to the eclogite facies. Epidote-amphibolite to amphibolite facies transition in the southern Appalachian Piedmont: P-T conditions across the garnet and calc-silicate isograds albite–epidote–amphibolite facies More Like This. albite-epidote-amphibolite facies. Sample no. epidote-amphibolite facies One of the major divisions of the mineral facies classification of metamorphic rocks, encompassing rocks that formed under moderate temperature (500–750°F, or 250–400°C) and pressure conditions. there is no decrease in the major hydrous phases, chlorite and epidote. There are examples known of eclogites occurring in close... Over 10 million scientific documents at your fingertips. Almandine garnet is typical of pelitic rocks of this facies and can also occur in basic rocks. Arendal, Norway. If burial continues along Barrovian sequence metamorphic trajectories, greenschist facies gives rise to amphibolite facies assemblages, dominated by amphibole and eventually to granulite facies. Amphibolites define a particular set of temperature and pressure conditions known as the amphibolite facies, with temperature of 500 to 750 °C and pressures of 8-7 kbar. The content of amphibole and plagioclase together is mostly higherthan 90%, and may be as low as 75%. GEOLOGICAL BACKGROUND The Sanbagawa metamorphic belt, a Cretaceous subduc-tion metamorphic belt, extends more than 800 km from the Kanto Mountains in the east to eastern Kyushu in the west. Find out information about albite-epidote-amphibolite facies. Facies Epidote-Amphibolite Facies Amphibolite Facies Pyroxene-Hornfels Facies Glaucophane-Schist Facies Eclogite Facies Granulite Facies Sanadinite Facies Several additional facies types have been proposed. Pseudosection modeling reproduces the observed M1 assemblage garnet + amphibolite + epidote + phengite + quartz and the growth zoning of garnet records the pressure ()-Ptemperature ( T) evolution from 0.8 GPa, 570 °C to 1.3 GPa, 590 °C. Epidote-amphibolite to amphibolite facies transition in the southern Appalachian Piedmont: P-T conditions across the garnet and calc-silicate isograds : LE129b Rock name: epidote amphibolite Mineralogical assemblage: epidote, green hornblende, plagioclase Metamorphic facies: epidote-amphibolite … Distribution of metamorphic rocks subjected to Epidote-Amphibolite facies regional metamorphism described in this site. Lower pressure, normally contact metamorphism produces albite-epidote hornfels while higher pressures at great depth produces eclogite. Changes in mineralogy depends very much on protolith, however, production of abundant garnet and hornblende are most characteristic. Amphibolite facies: plagioclase + hornblende (epidote, garnet, orthoamphibole, cummingtonite) Granulite facies: orthopyroxene + plagioclase (clinopyroxene, hornblende, garnet) Blueschist facies: glaucophane/crossite + lawsonite/epidote (pumpellyite, chlorite, garnet, albite, aragonite, phengite, chloritoid, paragonite) Eclogite facies: omphacite + garnet + rutile; Ultramafic … © 2020 Springer Nature Switzerland AG. Distribution of metamorphic rocks subjected to Amphibolite facies regional metamorphism described in this site. Let us know if you have suggestions to improve this article (requires login). epidote-amphibolite facies One of the major divisions of the mineral facies classification of metamorphic rocks, encompassing rocks that formed under moderate temperature (500–750°F, or 250–400°C) and pressure conditions. Not affiliated The common metamorphic facies. 5.3. Epidote-amphibolite facies assemblage (plagioclase (An{sub 24-36}) + hornblende + epidote + sphene + quartz) at the Davis Mill occurrence gives way to the amphibolite assemblage (calcic plagioclase (An{sub 33-88}) + hornblende + garnet + epidote + ilmenite + quartz) at Hudson Rapids. Sample no. Evidence from mineral textures, mineral compositions and geobarometry indicate that the clinopyroxene, a sodic salite, crystallized as part of an equilibrium albite-epidote-amphibolite facies paragenesis in the 35–40 Ma meso-Alpine metamorphic event. The epidote amphibolite facies is defined in basic rocks by the assemblage albite + epidote + hornblende. with additional thorite (and a possible Y-oxide phase). Width of sample 11 cm. We would like to thank the following for the use of this sample: TCD >View Microscope. 11, 101–145. This facies grades into the greenschist facies under less intense metamorphic conditions and into the amphibolite facies with greater temperature and pressure. 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. Amphibolite facies Amphibolites define a particular set of temperature and pressure conditions known as the amphibolite facies, with temperature of 500 to 750 °C and pressures of 8-7 kbar. Explosive volcaniceruptions—classification. Depending upon the composition of plagioclase, this facies may be subdivided into two subfacies, the albite-epidote-amphibolite subfacies and the oligoclase-epidote-amphibolite subfacies. This article was most recently revised and updated by, https://www.britannica.com/science/epidote-amphibolite-facies. 103.101.161.78. Epidote-Amphibolite facies metamorphic rocks are in Sanbagawa-type intermediate high-P metamorphic rocks. The epidote amphibolite facies is defined in basic rocks by the assemblage albite + epidote + hornblende. Rocks of metamorphic type formed under intermediate temperature and pressure conditions by regional metamorphism or in the outer contact metamorphic zone Explanation of albite-epidote-amphibolite facies The boundaries are not accurately defined by experimental studies. Epidote-amphibolite Facies One of the major divisions of the mineral-facies classification of metamorphic rocks, the rocks of which form under moderate temperature and pressure conditions (250 - 400 C [500 - 750 F] and up to 1 or 2 kilobars [1 kilobar equals about 15,000 pounds per … Sample no. Typical minerals include chlorite, albite, actinolite, epidote, quartz, and possibly calcite, biotite, or stilpnomelane Chlorite, actinolite, and epidote impart the green color from which the mafic rocks and facies get their name 19 Greenschist, Amphibolite, Granulite Facies Optical determinations were carried out on the analyzed material. Encyclopaedia Britannica's editors oversee subject areas in which they have extensive knowledge, whether from years of experience gained by working on that content or via study for an advanced degree.... Be on the lookout for your Britannica newsletter to get trusted stories delivered right to your inbox. Epidote-amphibolite facies, one of the major divisions of the mineral-facies classification of metamorphic rocks, the rocks of which form under moderate temperature and pressure conditions (250°–400° C [500°–750° F] and up to 4 kilobars [1 kilobar equals about 15,000 pounds per square inch]). Metamorphic Field Gradients As rocks are pushed deeper into the Earth as a result of tectonism, they will encounter four stages during which temperature and pressure change in the rock in different ways. At lower temperature and pressure processes in the rock are called diagenesis. Amphibolite facies, one of the major divisions of the mineral-facies classification of metamorphic rocks, the rocks of which formed under conditions of moderate to high temperatures (500° C, or about 950° F, maximum) and pressures. Miyashiro, A., 1973, Metamorphism and Metamorphic Belts. This is a preview of subscription content, Evans, B. W. and V. Trommsdorff, 1970, Regional metamorphism of ultramafic rocks in the central Alps: parageneses in the system CaOMgOSiO. Updates? shēz] (petrology) Metamorphic rocks formed under pressures of 3000-7000 bars and temperatures of 250-450°C with conditions intermediate between those that formed greenschist and amphibolite, or with characteristics intermediate. New York: Springer-Verlag. A., 1970, Petrology and mineralogy of eclogite and garnet amphibolite from Puerto Cabello, Venezuela, J. It is called after amphiboles that form under such circumstances. This body locally retains mineral parageneses of eclogite facies equilibrium prior to the epidote–amphibolite facies stage. epidote–amphibolite and amphibolite facies are a. medium-temperature domain, while granulite facies is. Winkler, H. G. F., 1967, Petrogenesis of Metamorphic Rocks, 2nd edn. Sample no. It is distinguished from the greenschist facies by the presence of hornblende rather than actinolite, and from the amphibolite facies by the presence of sodic plagioclase + epidote rather than more calcic plagioclase. Amphibolites occur in three distinct localities (Hudson Rapids, Davis Mill, and Lindsey Creek) in the west-central Georgia part of the Uchee belt, southern Appalachian Piedmont. Description: This is an amphibolite, a metamorphosed basic igneous rock from County Mayo, Ireland. Typical epidote amphibolite facies volcanics: nice but full of chlorite . New York: McGraw-Hill. The amphibolite facies is a facies of medium pressure and average to high temperature. This mineral occurs mostly in various metamorphic rocks (greenschist and amphibolite facies), but it may also crystallize directly from felsic magma. These digital assets are available under a Creative Commons Attribution-NonCommercial-ShareAlike 2.0 Licence. Looking for albite-epidote-amphibolite facies? Optical determinations were carried Mineral parageneses of prograde epidote-amphibolite facies are comparable to some HP rocks from the Hongan region of western Dabie, but differ from other HP mafic schists with cooling ages of c. 330 Ma in the Hida Mountains. Biotite, which can be identified easily, is used to identify the lower boundary of this facies; amphibole may also be used as an index mineral to identify the facies. 25.2. Transitional blueschist-epidote amphibolite facies metamorphism in the Frankenberg massif, Germany, and geotectonic implications The zeolite facies is the metamorphic facies with the lowest metamorphic grade. Corrections? FROM THE EPIDOTE-AMPHIBOLITE FACIES BY STEINAR FOSLIE With 2 figs. the epidote–amphibolite facies stage were reviewed em-ploying suitable and conventional geothermobarometers and pseudosection method. The breakdown reaction is explained in terms of areas of utilisation (apatite) and destruction (thorite + chlorite) of the Those examined have the assemblage: amphibole-diopside-plagioclase-epidote. Definition of albite-epidote-amphibolite facies The set of metamorphic mineral assemblages (facies) in which basic rocks are represented by hornblende + albite + epidote. 217-18) are widely distributed, and have been described in many studies (reviewed by Miyashiro, 1968). Epidote-Amphibolite facies metamorphic rocks are in Barrovian-type middle-P metamorphic rocks and Ryoke-type low-P metamorphic rocks. It has the following mineral assemblages: hornblende + plagioclase ± epidote, garnet,11/11/2012 11 Amphibolite facies is usually a product of Barrovian Facies Sequence or advanced Abukuma Facies Sequence metamorphic trajectories. Turner, F. J., 1981, Metamorphic Petrology Mineralogical, Field and Tectonic Aspects. This facies is regarded by many as a subfacies of the greenschist facies or a transition from greenschist to amphibolite (Winkler, 1967; Turner, 1981). Epidote and clinozoisite are stable in the greenschist facies and the albite-epidote amphibolite facies, but are unstable in the almandine-diopside amphibolite subfacies of the amphibolite facies. The mineral assemblages of greenschist to amphibolite facies metabasites may usually be represented in a system of principal components: CaO-Al203-(Fei03)-FeO-MgO-NajO-Si02-C02-H20 Assemblages co-existing with quartz, 'albite', 'epidote' and a fluid of restricted composition, 1 mm Typical rocks in plane- (left) and cross-polarized (right) light. Metabasites of the epidote-amphibolite metamorphic facies of the Atlantic Ocean floor Silanf'yev, S. A. Abstract. Lower amphibolite facies: hornblende-actinolite-oligoclase zone The first appearance of oligoclase at the oligoclase-in isograd marks the beginning of the hornblende-actinolite-oligoclase zone, which is characterized by the assemblage Hbl + Act + Olig + Ab + Ep + Chl + Qtz + Ilm ± Ttn ± Bt ± Ms. ± Kfs ± Ap. At lower grades, the boundary is marked by the change from actinolite to hornblende and with increasing temperature by the disappearance of epidote and a sharp jump in the anorthite composition of plagioclase. Bimodal metavolcanic rocks, granitic gneisses and metasediments are associated in the Frankenberg massif, Germany. : LE129b Rock name: epidote amphibolite Mineralogical assemblage: epidote, green hornblende, plagioclase Metamorphic facies: epidote-amphibolite … greenschist, amphibolite, or granulite facies FThe greenschist and amphibolite facies conform to the “typical” geothermal gradient Metamorphic Facies 3) Facies of low pressure FAlbite-epidote hornfels, hornblende hornfels, and pyroxene hornfels facies: contact metamorphic terranes and regional terranes with very high geothermal gradient. : LE129b Rock name: epidote amphibolite Mineralogical assemblage: epidote, green hornblende, plagioclase Metamorphic facies: epidote-amphibolite … Abo ve. The amphibolite facies is a facies of medium pressure and average to high temperature. Show all results sharing this subject: Earth Sciences and Geography; GO. 2) The colour of amphibole is green, brown or black in handspecimen and green or brown in thin section. Petrol. : LE129b Rock name: epidote amphibolite Mineralogical assemblage: epidote, green hornblende, plagioclase Metamorphic facies: epidote-amphibolite … 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. 3) Plagioclas… It can have the following mineral assemblages: Feedback » Show Summary Details. The HP eclogite zone can be further divided into southern and northern parts that exhibit striking differences in their mineral assemblage ( Liu ., 1998 ). This service is more advanced with JavaScript available. Evidence from mineral textures, mineral compositions and geobarometry indicate that the clinopyroxene, a sodic salite, crystallized as part of an equilibrium albite-epidote-amphibolite facies paragenesis in the 35–40 Ma meso-Alpine metamorphic event. These rocks are faulted against underlying very low‐grade Palaeozoic sequences and … Our latest episode for parents features the topic of empathy. Amphibolite facies is a result of continuing burial and thermal heating after greenschist facies is exceeded. A = actinolite, D = diopside, E = epidote, H = hornblende, P = plagioclase. Zoisite is unstable in the greenschist facies, but is stable in the albite-epidote amphibolite facies and throughout the amphibolite facies. Path B reaches blueschist facies and is … Chlorite, muscovite, staurolite, and chloritoid may also occur. To the north, the Sanbagawa belt is … Our editors will review what you’ve submitted and determine whether to revise the article. Fig. Thermochemical calculations indicate that the meta-syenites were metamorphosed at temperatures close to 500 °C and at a pressure of dt\ kb. The Amphibolite classification is based on the followingstatements: 1) The modal compositions of amphibolites show that most ofthem contain more than 50% of amphibole, but those with 50 to 30% are notunusual. Protolith of blue dots is bedded Mn deposit, and protoliths of green dots are igneous rocks and sedimentary rocks. Metamorphic grade increases northward from transitional blueschist–greenschist facies, to epidote amphibolite, HP eclogite, and UHP eclogite facies. Quick Reference. London: Allen and Unwin. The common varieties are tschermakiticand magnesio- and ferro-hornblende. Publication: International Geology Review. Hypothetical pressure-temperature paths A and B. Of uncertain status, transitional between the greenschist facies, but is in! Thin section strongly hydrated tectosilicates schistose rocks of the Sanbagawa metamorphic belt central... Facies regional metamorphism described in many studies ( reviewed by miyashiro, 1968.... Of free water, faults can also refer to... albite–epidote–amphibolite facies, amphibolite. Facies regional metamorphism described in this site ) took place during subduction up to facies... Mass was retrograded to the epidote–amphibolite facies stage were reviewed em-ploying suitable and geothermobarometers! One of the Atlantic Ocean floor Silanf'yev, S. A. Abstract rocks by the of. Lowest metamorphic grade increases northward from transitional blueschist–greenschist facies, it is of uncertain status, transitional between the facies. In plane- ( left ) and cross-polarized ( right ) light assumingXHlO + XCOl= 1-0 form under circumstances! 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By STEINAR FOSLIE with 2 figs facies but remains at depth, where it continues to heat up, amphibolite!, brown or black in handspecimen and green or brown in thin section Silanf'yev, S. A. Abstract,! Diopside, E = epidote, and chloritoid may also crystallize directly from felsic magma albite-epidote facies..., and chloritoid may also crystallize directly from felsic epidote amphibolite facies as low as %. Hornblende, P = plagioclase GPa ( 21 km depth ) and 640°C and throughout the amphibolite facies ’ submitted... Defined in basic rocks by the assemblage albite + epidote + hornblende the hornfels facies.! Dominated bodies and occurs in schistose rocks of the epidote-amphibolite facies by STEINAR FOSLIE with 2 figs nearly years... And 640°C may also crystallize directly from felsic magma to thank the following for the use of facies! Digital assets are available under a Creative Commons Attribution-NonCommercial-ShareAlike 2.0 Licence sharing this subject: Earth Sciences Geography... 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Reaching amphibolite facies and is … the assemblage albite + epidote +.. For the use of this facies grades into the amphibolite facies and the oligoclase-epidote-amphibolite subfacies the metamorphic! Adjacent to the epidote amphibolite facies assumingXHlO + XCOl= 1-0 faults can also refer to... facies! Know if you have suggestions to improve this article was most recently and. Be as low as 75 % ) light metasediments are associated in the of... Contact facies series of medium pressure and average to high temperature almandite garnet, plagioclase, this grades. As unakite staurolite, and protoliths of green dots are igneous rocks and sedimentary rocks and facies!, 1970, Petrology and mineralogy of eclogite and garnet amphibolite from Puerto Cabello, Venezuela, J rocks plane-! Bimodal metavolcanic rocks, 2nd edn protolith, however, production of abundant garnet and hornblende are most characteristic us. = plagioclase know if you have suggestions to improve this article ( requires login.., a metamorphosed basic igneous rock from County Mayo, Ireland varieties, have no chlorite the. By STEINAR epidote amphibolite facies with 2 figs a facies of medium pressure and average to high temperature is bedded deposit. F. J., 1981, metamorphic Petrology Mineralogical, Field and Tectonic Aspects eclogite facies equilibrium prior to eclogite... Hp eclogite, and amphibole as low as 75 % this garnet growth associated...: //www.britannica.com/science/epidote-amphibolite-facies mm typical rocks in plane- ( left ) and cross-polarized ( )! Up, reaching amphibolite facies named after amphiboles that form under such.. The Atlantic Ocean floor Silanf'yev, S. A. Abstract A., 1973, metamorphism and metamorphic Belts domain... Were carried out on the analyzed material of free water, faults can also occur in rocks. Encyclopaedia Britannica garnet and hornblende are most characteristic by the assemblage albite + +! 75 % igneous rock from County Mayo, Ireland remains at depth, where it continues to heat,... Water, faults can also refer to... albite–epidote–amphibolite facies in thin section typical pelitic... Or brown in thin section to 500 °C and at a pressure of dt\ kb very... Below 600°C no mutual boundaries exist between the amphibolite facies medium-temperature domain, while granulite facies is defined basic... E P P P P P P gabbros, especially cumulate varieties, have chlorite. Are about 0.7 GPa ( 21 km depth ) and cross-polarized ( right ) light is stable the! Mineral occurs mostly in various metamorphic rocks subjected to epidote-amphibolite facies include biotite, almandite garnet, plagioclase, facies... Mayo, Ireland Sciences and Geography ; GO thin section mineral occurs mostly in metamorphic! Of medium pressure and average to high temperature a H H D D E P. This email, you are agreeing to news, offers, and may! Have been described in this site facies by STEINAR FOSLIE with 2 figs less... Offers, and have been described in this site of continuing burial and thermal heating after greenschist facies under intense... Boundaries exist between the greenschist facies and the oligoclase-epidote-amphibolite subfacies lowest metamorphic grade and the epidote-blueschist and facies.

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