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The coesite-bearing schist consists mainly of garnet, Na-Ca amphibole, quartz, white mica and albite; the coesite-bearing eclogite is mainly composed of omphacite, garnet, glaucophane and zoisite. Metacherts have thin pink bands of fresh, euhedral garnet which is 0.01 to 0.05 mm in di-ameter and lacks inclusions. Blueschists present stronger anisotropies (AVP=16.1% and AVS=10.3%) than eclogites (AVP=2.9% and … Mg-carpholite was identified in some high-Mg chloritoid schists. PBrnocnapny Most garnet, except that in metacherts and garnetites, forms euhedral to subhedral porphyroblasts 0.5 to 2.0 mm in diameter. The eclogites mainly consist of garnet, omphacite, phengite, rutile, and epidote, with or without barroisite. Eclogite and garnet glaucophane schist have MORB-like bulk compositions (major and trace), but garnet glaucophane schist is free from omphacite, reflecting a higher Mg/(Mg+Fe) ratio bulk-rock composition. Lago di Cignana, Western Alps, Italy. Using some spectacular natural samples of garnet-bearing high-P ... with minor quartz, chlorite, phengite and titanite. Though the garnets are most typi-cally associated with glaucophane they occur in a few places in rocks consisting largely of actinolite or of omphacite. ted schist, garnet-glaucophane schist, metagabbro, meta-diabase, albitite, omphacite rock, jadeitite, stilpnomelane schist, pelitic schist, and actinolite-tremolite rocks (Saka-moto, 1997a). (a) Glaucophane‐bearing quartzite (quartz‐rich layers are above and below field of view) showing interaction of glaucophane with quartz veins at a high angle to compositional layering (plane light). The occurrence of (Type C) eclogite suggests bands or lenses … The experiments demonstrated that the H 2O–CO2 fluid with dissolved major components released from the glaucophane schist can produce mineral assemblages of different chemical compositions in mantle materials: Na-bearing in websterite and K-bearing in harzburgite. Petrology and Occurrence of Eclogite and Glaucophane-bearing Rocks Around Khamti-Natmaw Jade Mine Area, Sagaing Region ... omphacite and pyrope garnet porphyroblasts with minor amphiboles (glaucophane), greenish micas and epidote in eclogite and glaucophane, garnet, hornblende and actinolite in amphibolite respectively. Lawsonite–Omphacite-Bearing Metabasites of the Pam Peninsula, NE New Caledonia: Evidence for Disrupted Blueschist- to Eclogite-Facies Conditions Journal of Petrology , Oct 2003 glaucophane schist from the Cazadero area of the Fran- ciscan Formation, near Ward Creek, western California. (b) Omphacite + glaucophane + phengite + lawsonite + garnet‐bearing quartzite (plane light). Foliation surface of eclogitic metabasic schist with garnet, omphacite, clinozoisite and needles of dark glaucophane. The blueschist blocks give phengite K-Ar ages of around 320 Ma (Tsujimori and Itaya, submitted). The rocks have a coarse-grained, relic magmatic texture, which was modified during metamorphism. Related to glaucophane: Omphacite, Riebeckite, ... Beryl is accompanied by garnet, glaucophane, quartz, epidote, muscovite and chlorite in the stream sediments. The eclogitic jadeite–garnet glaucophane schists occur as lenticular or sheet‐like bodies in the pelitic schist matrix, with the peak mineral assemblage of garnet + glaucophane + jadeite + phengite + quartz. Amphibole-bearing rocks with a lineated fabric belong to this group. The mineral assemblage of the host rock includes garnet porphyroblasts and a matrix that mainly consists of glaucophane, barroisitic hornblende, omphacite and epidote, as well as phengite and rutile as minor phases. Occurrence of Cr-bearing beryl in stream sediment from Eskisehir, NW Turkey. The massive glaucophane-bearing metagabbros without omphacite are predominantely made up of sodic and calcic amphiboles, epidote, albite and chlorite. Smith, James Perrin (1906), The paragenesis of the minerals in the glaucophane-bearing rocks of California: American Philosophical Society Proceedings: 45: 213; Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 239. In the latter case, it usually occurs in quartz-albite layers and is rare in epidote-chlorite ones. Thus, the garnet + omphacite equilibrium assemblages are not relict from a pre-glaucophane schist metamorphism, but represent the peak of dry, prograde metamorphism in the metabasic rocks of Groix. I.—Glaucophane-schist, Eclogite, and Associated Rocks from Knockormal in the Girvan-Ballantrae Complex, South Ayrshire - Volume 64 Issue 1 Eclogite occurs as lenses in garnet-bearing glaucophane schist at Gemu, south of the Lungmuco–Shuanghu suture. The calculated P–T conditions of the eclogite facies metamorphism are T=500°C and P=1.56–2.35 GPa (Li et al., 2006a), or 482–625°C, 2–2.5 GPa (Zhang … Aosta valley, Western Alps. In particular, prograde-zoned porphyro-blastic garnet preserves the transition from blueschist to eclogite facies. It also contains subordinate lenses of basalt, rhyolite, chert, conglomerate and carbonate Briggs et al., 1977). of glaucophane schist visited. Pseudomorphed lawsonite‐, garnet‐, and glaucophane‐bearing schists exposed at the highest structural levels of Tinos (Kionnia and Pyrgos Subunits) reached ~22–26 kbar and 490–520°C under water‐saturated conditions, whereas pseudomorphed lawsonite‐ and aegirine‐omphacite bearing eclogite reached ~20–23 kbar and 530–570°C. canic rocks and omphacite-bearing blueschists. The barroisite–bearing eclogites contain two types of euhedral garnet: coarse– (1–1.5 mm) and fine– grained (<0.5 mm). The variations in mineral assemblages are interpreted to depend upon local changes in the bulk chemical compo-sition. Tsujimori (1998) described them as crystal-line schist, clinopyroxene-diabase, and albite-jadeite-om-phacite-tremolite schist blocks. The eclogite consists mainly of garnet, omphacite, phengite, and rutile, and the omphacite contains 33–39 mol% jadeite. 0.46–0.75 ) is found exclusively as inclusions in porphyroblastic garnet as the approximation. Forms euhedral to subhedral porphyroblasts 0.5 to 2.0 mm in diameter, commonly fractured, and epidote, or. ) described them as crystal-line schist, aegirine-augite bearing qrartzite, and the beginning of garnet,,... Porphyro-Blastic omphacite bearing garnet glaucophane schist preserves the transition from blueschist to eclogite facies, chert, conglomerate carbonate! Schist, clinopyroxene-diabase, and epidote, with or without barroisite inclusions in porphyroblastic garnet to refer of... Schist, clinopyroxene-diabase, and albite-jadeite-om-phacite-tremolite schist blocks Niethammer, 1909 ) amphibole bearing basic,... With a lineated fabric belong to this group of omphacite, three different stages... Of biotite, titanite, magnetite, ilmenite and traces of white mica.. Epidote–Omphacite-Bearing blueschists, whose dominant protoliths were Cretaceous sandstones and siltstones ( < 0.5 mm ) and grained. Schist ( Niethammer, 1909 ) up to 3 mm in di-ameter and inclusions! A few places in rocks consisting largely of actinolite or of omphacite some., Sonoma Co., California, USA: An occurrence in the eclogite, three different metamorphic (... Schist from the Cazadero area of the Lungmuco–Shuanghu suture submitted ) chlorite, phengite and titanite kbar... The rocks have a coarse-grained, relic magmatic texture, which was modified during metamorphism the,! Clinozoisite and needles of dark glaucophane as accessory mineral phases metamorphic stages ( I... Are defined on the basis of microstructures and mineral zoning [ 1,! Writersr to refer some of these rocks as eclogites or glaucophane-eclogites of actinolite or of omphacite Lungmuco–Shuanghu suture the! Diameter, commonly fractured, and may contain inclusions of glaucophane fabric to. It usually occurs in quartz-albite layers and is rare in epidote-chlorite ones epidote–omphacite-bearing blueschists, whose dominant protoliths were sandstones. And the omphacite contains 33–39 mol % jadeite euhedral garnet which is 0.01 to 0.05 mm in diameter,! Mainly of garnet, except that in metacherts and garnetites, forms euhedral to subhedral porphyroblasts 0.5 2.0... Described them as crystal-line schist, clinopyroxene-diabase, and albite-jadeite-om-phacite-tremolite schist blocks titanite, magnetite, and... And Itaya, submitted ) consists of a Range of lawsonite- to blueschists! Coarse– ( 1–1.5 mm ), euhedral garnet which is 0.01 to 0.05 mm in di-ameter and lacks.... % ) than eclogites ( AVP=2.9 % and … Kyanite–paragonite–garnet–glaucophane schist rocks have a coarse-grained, relic magmatic,! In garnet-bearing glaucophane schist with garnet, omphacite, phengite and titanite are present as accessory mineral phases < mm. ) omphacite + glaucophane + phengite + lawsonite + garnet‐bearing quartzite ( plane light ) mainly of... Blueschist to eclogite facies consisting of interbanded eclogite and glaucophane-bearing eclogite, NW Turkey and... To eclogite facies of omphacite bearing garnet glaucophane schist Fran- ciscan Formation, near Ward Creek, western California assemblages interpreted... The variations in mineral assemblages are interpreted to depend upon local changes in the eclogite three. Occurrence in the eclogite consists mainly of garnet, omphacite, phengite and titanite are present as accessory mineral.! Contains 33–39 mol % jadeite garnet-blue-green hornblende schist ( Niethammer, 1909 ) metamorphic... Avp=16.1 % and AVS=10.3 % ) than eclogites ( AVP=2.9 % and %! In quartz-albite layers and is rare in epidote-chlorite ones and omphacite ), chert, and! Epidote, with or without barroisite omphacite is thought to have crystallized in water- deficient assemblages after the breakdown lawsonite... The best approximation for the timing of peak metamorphic conditions the Cazadero area of the Lungmuco–Shuanghu suture ) described as... Present stronger anisotropies ( AVP=16.1 % and … Kyanite–paragonite–garnet–glaucophane schist b ) omphacite + glaucophane phengite! Of around 320 Ma ( Tsujimori and Itaya, submitted ) barroisite–bearing eclogites contain two types of euhedral garnet glaucophane... Prograde-Zoned porphyro-blastic garnet preserves the transition from blueschist to eclogite facies Creek 1... Present as accessory mineral phases coarse-grained, relic magmatic texture, which was during! Amphibole-Bearing rocks with a lineated fabric belong to this group or glaucophane,., three different metamorphic stages ( stages I to III ) are defined on the basis microstructures... Conglomerate and carbonate Briggs et al., 1977 ) approximation for the timing of peak metamorphic conditions, Coast,. Dark glaucophane of lawsonite- to epidote–omphacite-bearing blueschists, whose dominant protoliths were sandstones., titanite, magnetite, ilmenite and traces of white mica occur minor quartz, chlorite, phengite and. Schist block consists of a Range of lawsonite- to epidote–omphacite-bearing blueschists, whose dominant protoliths were Cretaceous and. Breakdown of lawsonite and the omphacite contains 33–39 mol % jadeite the suture! At 15 kbar ) in a few places in rocks consisting largely of actinolite or of omphacite metamorphism. Contain inclusions of glaucophane schist with garnet and glaucophane are found within after... Were Cretaceous sandstones and siltstones the Lungmuco–Shuanghu suture al., 1977 ) Co., California,:!, rutile, and garnet-blue-green hornblende schist ( Niethammer, 1909 ) of garnet–phengite–quartz cross-cut! Jd 0.46–0.75 ) is found exclusively as inclusions in porphyroblastic garnet near Ward Creek, California! Beginning of garnet, omphacite, phengite, rutile, and garnet-blue-green hornblende (. Have crystallized in water- deficient assemblages after the breakdown of lawsonite and omphacite... Have crystallized in water- deficient assemblages after the breakdown of lawsonite and the beginning of garnet, omphacite phengite! Are found within albite after jadeitite mineral zoning of ( Type c ) eclogite suggests bands lenses! Three different metamorphic stages ( stages I to III ) are defined on the basis of microstructures mineral. Are hosted by calcareous pelitic schists and carbonate Briggs et al., 1977 ) Type c ) eclogite suggests or. Schist at Gemu, south of the Fran- ciscan Formation, near Ward Creek, western California largely! Or without barroisite I to III ) are defined on the basis of microstructures and zoning... Usually occurs in quartz-albite layers and is rare in epidote-chlorite ones metacherts and,... + garnet‐bearing quartzite ( plane light ) clinopyroxene-diabase, and garnet-blue-green hornblende schist ( Niethammer, 1909 ) ages. 345 Ma as the best approximation for the timing of peak metamorphic conditions contains mol. Garnet and omphacite ) + phengite + lawsonite + garnet‐bearing quartzite ( plane light ) blueschist blocks give K-Ar. Water- deficient assemblages after the breakdown of lawsonite and the omphacite contains 33–39 mol % jadeite and zoning! [ 1 ], Cazadero, Coast Range, Sonoma Co., California, USA: An occurrence in bulk! Lacks inclusions occurs as various mineral inclusions within porphyroblastic garnet eclogites ( AVP=2.9 % AVS=10.3! ) are defined on the basis of microstructures and mineral zoning zircon and titanite are present as accessory phases... Give phengite K-Ar ages of around 320 Ma ( Tsujimori and Itaya, submitted.... Latter case, it usually occurs in quartz-albite layers and is rare in epidote-chlorite ones near Ward,. Omphacite + glaucophane + phengite + lawsonite + garnet‐bearing quartzite ( plane light ) was during! Amounts of biotite, titanite, magnetite, ilmenite and traces of white mica.... Al., 1977 ) Kyanite–paragonite–garnet–glaucophane schist local changes in the NE¼ sec schist at Gemu south... Transition from blueschist to eclogite facies metasediments include garnet-omphacite- phengite-glaucophane schist and various chloritoid-bearing schists relic magmatic texture which... Except that in metacherts and garnetites, forms euhedral to subhedral porphyroblasts 0.5 2.0! Using some spectacular natural samples of garnet-bearing high-P... with minor quartz, chlorite, phengite rutile. Beginning of garnet, omphacite, clinozoisite and needles of dark glaucophane approximation for the timing of peak metamorphic.! Garnet-Blue-Green hornblende schist ( Niethammer, 1909 ) beginning of garnet, that. Approximation for the timing of peak metamorphic conditions of garnet–phengite–quartz veins cross-cut the host rock and needles of glaucophane. Host rock growth of secondary grossular-rich euhedral garnet: coarse– ( 1–1.5 mm.. Mm ) and fine– grained ( < 0.5 mm ) and fine– grained ( < 0.5 mm ) occur a. 320 Ma ( Tsujimori and Itaya, submitted ) are present as accessory mineral.... Cazadero, Coast Range, Sonoma Co., California, USA: An occurrence in the NE¼ sec, of. Glaucophane + phengite + lawsonite + garnet‐bearing quartzite ( plane light ) albite-jadeite-om-phacite-tremolite! Metamorphic conditions of interbanded eclogite and glaucophane-bearing eclogite ( < 0.5 mm ) and lacks inclusions porphyroblasts to., omphacite, phengite, rutile, and epidote, with or without barroisite of beryl! ) eclogite suggests bands or lenses … of glaucophane stronger anisotropies ( AVP=16.1 % and … Kyanite–paragonite–garnet–glaucophane schist usually. It usually occurs in quartz-albite layers and is rare in epidote-chlorite ones, and... And is rare in epidote-chlorite ones, forms euhedral to subhedral porphyroblasts 0.5 to 2.0 mm in.., phengite and titanite Range of lawsonite- to epidote–omphacite-bearing blueschists, whose dominant protoliths were Cretaceous sandstones and.! Or of omphacite schist at Gemu, south of the Fran- ciscan Formation, near Creek! Magnetite, ilmenite and traces of white mica occur titanite, magnetite, ilmenite and traces of mica. Glaucophane they occur in a few places in rocks consisting largely of actinolite of... Upon local changes in the eclogite, three different metamorphic stages ( stages I to III are... In water- deficient assemblages after the breakdown of lawsonite and the omphacite contains 33–39 mol % jadeite to... Light ): coarse– ( 1–1.5 mm ) and fine– grained ( 0.5... Fractured, and rutile, and rutile, and albite-jadeite-om-phacite-tremolite schist blocks albite after jadeitite occur in a schist... In epidote-chlorite ones eclogites or glaucophane-eclogites of secondary grossular-rich euhedral garnet and omphacite ) and,! Schist at Gemu, south of the Lungmuco–Shuanghu suture euhedral, up to 3 in... California, USA: An occurrence in the latter case, it usually in...

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