 | | Journal (article/letter/editorial) | | Netherlands ORIGIN OF ECLOGITES FROM SOUTH BRITTANY,FRANCE: A Sm-Nd ISOTOPICAND REE STUDY J. BERNARD-GRIFFITHS...for publication December 35042 Rennes Ce’dex (France) 12, 1984) Abstract Bernard-Griffiths, J. and...Cornichet, J., 1985. Origin of eclogites from south Brittany, isotopic and REE study. In: D.C. Smith and Ph...Chem. Geol. (Isot. Geosci. Sect.), 52: 185-201. France: A Sm-Nd Geochemistry and Rare-earth element (REE)...Armorican massif in the Hercynian fold-belt of western France. The REE distribution patterns suggest that: (1) |  | Zhang, Yong, Pan, Tong, Zhang, Aikui, He, Shuyue, Qian, Ye, Bai, Yongshan (2023) Spatial Relationship between Eclogite and Copper-Nickel Mineralization in East Kunlun, China. Minerals, 13 (3) 330 doi:10.3390/min13030330 | Journal (article/letter/editorial) | | minerals Article Spatial Relationship between Eclogite and Copper-Nickel Mineralization in East Kunlun...Qian, Y.; Bai, Y. Spatial Relationship between Eclogite and Copper-Nickel Mineralization in East Kunlun...between the Cu-Ni deposits and eclogite distribution. In this study, eclogite samples from the Xiarihamu...electron probe microanalysis (EPMA). Further, eclogite protolith properties, the formation environment...mechanism were also investigated. Geochemically, eclogite is rich in MgO and FeO and low in alkali and SiO2 |  | Tan, Zhou, Agard, Philippe, Gao, Jun, John, Timm, Li, JiLei, Jiang, Tuo, Bayet, Léa, Wang, XinShui, Zhang, Xi (2017) P–T–time-isotopic evolution of coesite-bearing eclogites: Implications for exhumation processes in SW Tianshan. Lithos, 278. 1-25 doi:10.1016/j.lithos.2017.01.010 | Journal (article/letter/editorial) | | Tianshan SC RI Key words: UHP metamorphism; eclogite; P-T path; pseudosection modeling; thermobarometry;...de Paris (ISTeP), 4 place Jussieu, 75005 Paris, France University of Chinese Academy of Sciences, 100049...China d. Insitut Universitaire de France, F-75005, Paris, France e. Institut für Geologische Wissenschaften...coesite-bearing ED eclogite samples from a thick (~ 5 meters) layered metabasalt outcrop in order to PT...GPa, 540 ± 20 ℃ at 316.8 ± 0.8 Ma, then, with eclogite-facies deformation ~ 2.0 ± 0.15 GPa, 525 ± 25 |  | Tan, Zhou, Gao, Jun, Jiang, Tuo, Wang, Xinshui, Zhang, Xi (2019) P–T–time (phengite Ar closure) history of spatially close-outcropping HP and UHP oceanic eclogites (southwestern Tianshan): implication for a potential deep juxtaposing process during exhumation?. International Geology Review, 61 (10) 1270-1293 doi:10.1080/00206814.2018.1507760 | Journal (article/letter/editorial) | | recent study on the ultra-high pressure (UHP) eclogite revealed a short timescale of exhumation (≤10...samples from a HP eclogite lens and its host rock, the UHP thick-layered eclogite. Based on data from...geodynamics. According to modelling results, the HP lens eclogite reached peak metamorphism at ~550°C, 2.50 GPa...prograde metamorphism. In contrast, the UHP layered eclogite experienced UHP peak burial at ~510°C, 2.95 GPa...well-preserved mafic KEYWORDS (U)HP metamorphism; oceanic eclogite; thermodynamic modelling; muscovite Ar–Ar dating; |  | | Journal (article/letter/editorial) | | in Austria Petrologic Constraints for Eoalpine Eclogite Facies Metamorphism in the Austroalpine Otztal...tschermakitic to pargasitic green amphiboles, omphacite (Jd4o), garnet II (Gr2o-3o PYl0), phengite (Si3...garnet and omphacite are interpreted as retrograde reaction products. Retrogression of the eclogite parageneses...Symplectites of diopside and plagioclase after omphacite, AI- and Na-poor green amphiboles, grossularite-poor...temperature conditions of the eclogite stage derived from Jd-content in omphacite and the gt-cpx-geothermometer |  | | Journal (article/letter/editorial) | | high-pressure fluids during retrograde metamorphism of eclogite-facies rocks ( Voltri Massif, Italian Western...porphyroclasts of omphacite (omphacite I) and are absent in later fine-grained omphacite (omphacite II) that forms...forms the mylonitic foliation. Omphacite I has been frequently replaced by retrograde symplectites (clinopyroxene...by availability of the fluid inclusions inside omphacite I. The symplectites have been in turn overgrown...amphiboles, indicating that breakdown of the omphacite I to symplectites still occurred at relatively |  | Songnian, Lu, Huaikun, Li, Haifeng, Yu, Fengqing, Zhao, Chunliang, Yang (1999) Neoproterozoic Orogeny in Northwestern China. Gondwana Research, 2 (4) 610-611 doi:10.1016/s1342-937x(05)70217-3 | Journal (article/letter/editorial) | | Devonian unconformity were discovered. Recently an eclogite-granitoid gneiss belt, which is situated along...monzonite-granite and Krich granite. A typical coesite-eclogite outcrop has been discovered recently on the Yuqiahe...The eclogite occurs lenticularly in the granitoid gneiss of the Dakendaban Complex. The eclogite consists...consists predominantly of garnet and omphacite with minor quartz/ coesite, muscovite/phengite, hornblende...almandine, 26-31% pyrope and 13-19'/0 grossular. The omphacite contains 45-48% jadeite. A little amount of phengite |  | | Journal (article/letter/editorial) | | metagabbros and Cpx-bearing granulites. All the eclogite samples studied are formed of well-preserved HP...these eclogites are petrologically similar to the eclogite samples from the better known Běstvina Unit. Eclogites...preserve relict mineral assemblage from a pre-eclogite stage, enclosed in garnet with prograde zoning...kyanite eclogite from Úhrov (Medaris et al. 2006), 800–850 °C and 1.7–1.9 GPa for Spačice eclogite, 1160–1180...1160–1180 °C a 1.7–1.9 GPa for the quartz-rich eclogite, and 960 °C a 1.9 GPa for other eclogites. Faryad |  | | Journal (article/letter/editorial) | | S0016-7037(00)00801-8 Oxygen isotope equilibrium between eclogite minerals and its constraints on mineral Sm-Nd...systems of eclogite minerals. The omphacite– garnet pairs of oxygen isotope equilibrium at eclogite-facies...thus attainment of isotopic equilibrium in the omphacite– garnet O system suggests achievement of Nd isotope...pairs. The presence or absence of fluid in the eclogite protoliths is a major rate-controlling factor...disequilibrium has been often observed between garnet and omphacite, resulting in geologically meaningless isochron |  | | Journal (article/letter/editorial) | | metamorphic belt, East China. Eclogite, gneiss, amphibolite (retrograded from eclogite), ultramafic rocks, and...laser-ablation oxygen isotope analyses on garnet, omphacite, quartz, kyanite, amphibole, phengite, rutile...rocks in the depth range of 0–3,000 m (mainly eclogite and gneiss) show that the investigated rocks can...primary medium-to-high salinity inclusions in omphacite, kyanite and quartz, and abundant secondary low-salinity...an UHP terrain. Studies of layered rocks at the outcrop scale have demonstrated the important control of |  | | Journal (article/letter/editorial) | | Petrology and Mineralogy of Eclogite and Garnet Amphibolite from Puerto Cabello, Venezuela by BENJAMIN...of garnet-clinopyroxene (eclogite), garnet-clinopyroxeneamphibole (eclogite-amphibolite) and garnet-amphibole...the epidote-amphibolite facies. Occurrences of eclogite rocks usually are found to be xenoliths in kimberlite...blocks in migmatites and schists. The presence of eclogite metamorphosed in situ with rocks of obvious sedimentary...September 5, 2015 ABSTRACT Occurrences of eclogite, eclogite-amphibolite, and garnet amphibolite from |  | Miller, C., Thöni, M., Konzett, J., Kurz, W., Schuster, R. (2005) Eclogites from the Koralpe and Saualpe type-localities, Eastern Alps, Austria. Mitteilungen der Österreichischen Mineralogischen Gesellschaft, 150. | Journal (article/letter/editorial) | | 590 °C at 250-270 Ma; HABLER & THÖNI, 2001), and eclogite facies (2.4 GPa and 650-730°C at approximately...pegmatite gneisses. Meter to kilometre-sized lenses of eclogite, eclogiteamphibolite and (meta)gabbros occur within...is also linked to the rapid exhumation of the eclogite bearing unit (KURZ & FRITZ, 2003). Subsequent...either quartz- or kyanite-rich and contain garnet, omphacite, quartz, kyanite, zoisite/clinozoisite, rutile...Amphiboles may be in textural equilibrium with omphacite and garnet, but more frequently form poikiloblasts |  | | Journal (article/letter/editorial) | | ISTEP, F-75005, Paris, France CNRS, UMR 7193, ISTEP, F-75005, Paris, France a r t i c l e i n f o...glaucophane and phengite) instead of garnet and omphacite decreased by 5 to 10% the rock density and subsequently...where rare coesite inclusions within garnet and omphacite are known since the work of Reinecke (1991; see...During subduction and recrystallization under eclogite-facies conditions, initial hydration and subsequent...talcschists) alternating with the anhydrous garnet–omphacite eclogitic assemblage (Oberhansli, 1982; Widmer |  | Franceschelli, M., Eltrudis, A., Memmi, I., Palmeri, R., Carcangiu, G. (1998) Multi-stage metamorphic re-equilibration in eclogitic rocks from the Hercynian basement of NE Sardinia (Italy) Mineralogy and Petrology, 62 (3) 167-193 doi:10.1007/bf01178028 | Journal (article/letter/editorial) | | relics of eclogite facies re-equilibration. Four stages of evolution have been identified: an eclogite stage...amphibolite to greenschist stage. A possible pre(?)-eclogite stage is documented by inclusions of euhedral...which the eclogite climax developed (T up to 700 °C, P = 13-15 kbar), as documented by omphacite inclusions...mineral reactions after the eclogitic stage are: omphacite --+ diopside ÷ plagioclase (symplectite) and garnet...1976; Ghezzo et al., 1982). Since they contain eclogite-facies relics, these bodies can record both deformation |  | | Journal (article/letter/editorial) | | TEXTURES IN ZIRCON GENERATED BY OCEAN-FLOOR AND ECLOGITE-FACIES METAMORPHISM: A CATHODOLUMINESCENCE AND...ocean-floor and the Eoalpine metamorphism, in eclogite-facies conditions, respectively. We contend that...star indicates the location of the Lugros eclogite outcrop from which the zircon crystals dated by SHRIMP...Alpine metamorphism in the MC developed under eclogite-facies conditions during the first Alpine metamorphic...rise to the Eo-alpine metamorphic event, in the eclogite-facies conditions (Puga et al. 2002a). A part |  | | Journal (article/letter/editorial) | | Shuanghe and Bixiling areas, consist of garnet, omphacite, phengite, epidote, hornblendic amphibole, quartz/coesite...eclogites should have a peak assemblage of garnet + omphacite + lawsonite + phengite + coesite in most rocks...predicted to have a peak assemblage of garnet + omphacite + coesite ± phengite without lawsonite, where...porphyroblasts and kyanite-bearing quartz veins in eclogite. As lawsonite dehydration can facilitate evolution...rights reserved. Accepted Article Keywords: UHP eclogite; phase equilibria; P–T path; Dabie orogen. INTRODUCTION |  | Matsumoto, M., Wallis, S., Aoya, M., Enami, M., Kawano, J., Seto, Y., Shimobayashi, N. (2003) Petrological constraints on the formation conditions and retrograde P-T path of the Kotsu eclogite unit, central Shikoku. Journal of Metamorphic Geology, 21 (4) 363-376 doi:10.1046/j.1525-1314.2003.00449.x | Journal (article/letter/editorial) | | conditions and retrograde P–T path of the Kotsu eclogite unit, central Shikoku M. MATSUMOTO,1,2 S. WALLIS...Japan ABSTRACT A largely undocumented region of eclogite associated with a thick blueschist unit occurs...composition of coexisting garnet and omphacite suggests that the Kotsu eclogite formed at peak temperatures of...significant differences in oxygen fugacity of the eclogite reflected in mineral chemistries. The peak pressure...history recorded by the eclogite, and the composition of omphacite in associated eclogite facies pelitic schist |  | | Journal (article/letter/editorial) | | both d18O and dD. Grnets from coesite-bearing eclogite are as low as 211‰ (VSMOW) and rutiles are 215‰...were all subjected to metamorphism in the coesite-eclogite facies. Oxygen isotope fractionation between quartz...discovery of low 18O values at the First International Eclogite Workshop, Stanford University, in 1994 (Yui et...their ephemeral existence as a world’s record for eclogite, however. The isotopic geochemistry of Qinglongshan...NNE-SSW for several kilometers with outcrops of eclogite flanked by quartz-feldspar-amphibole gneiss to |  | WEI, C. J., YANG, Y., SU, X. L., SONG, S. G., ZHANG, L. F. (2009) Metamorphic evolution of low-Teclogite from the North Qilian orogen, NW China: evidence from petrology and calculated phase equilibria in the system NCKFMASHO. Journal of Metamorphic Geology, 27 (1) 55-70 doi:10.1111/j.1525-1314.2008.00803.x | Journal (article/letter/editorial) | | 1525-1314.2008.00803.x Metamorphic evolution of low-T eclogite from the North Qilian orogen, NW China: evidence...NW China share a common assemblage of garnet, omphacite, glaucophane, epidote, phengite, quartz and rutile...for amphibole and clinopyroxene. Garnet in the eclogite typically exhibits growth zonations in which pyrope...P–T conditions of lawsonite-eclogite facies at the pre-peak stage. Omphacite shows an increase in jadeite...respectively, for the same assemblage garnet + omphacite + glaucophane + lawsonite (+ phengite + quartz |  | QIU, H.-N., WIJBRANS, J. R., BROUWER, F. M., YUN, J.-B., ZHAO, L.-H., XU, Y.-G. (2010) Amphibolite facies retrograde metamorphism of the Zhujiachong eclogite, SE Dabieshan: 40Ar/39Ar age constraints from argon extraction using UV-laser microprobe, in vacuo crushing and stepwise heating. Journal of Metamorphic Geology, 28 (5) 477-487 doi:10.1111/j.1525-1314.2010.00875.x | Journal (article/letter/editorial) | | facies retrograde metamorphism of the Zhujiachong eclogite, SE Dabieshan: 40Ar ⁄ 39Ar age constraints from...Amsterdam, The Netherlands ABSTRACT The Zhujiachong eclogite in the south-eastern Dabieshan ultra-high-P terrane...garnet-amphibolite mineral assemblages in most rocks in the outcrop. This study is focused on providing age constraints...symplectite matrix that formed during retrogression from eclogite pyroxene. Late stage hydrothermal activity leading...observed from thin-sections of the retrograded eclogite: phengite fi paragonite and amphibole in matrix |  | | Journal (article/letter/editorial) | | within eclogites. Transformation of gabbro into eclogite is documented in different stages ranging from...Typical eclogite parageneses are Grt + Omp + Zo + Ky + Qtz + Amp k Phe + Rut. The metapelitic eclogite host...Sm-Nd mineral isochrons (Pl-Cpx) for the gabbroic eclogite precursors give ages of between 247 + 16 and 255...L- 5, 101 + 7 and 109 + 8 Ma. The metapelitic eclogite host rocks (mica schists) yield Nd DM (depleted...Ma. Keywords: Sm-Nd mineral dating; Eclogite; Gabbro-eclogite transition; High-P metamorphism; Alpine |  | Guo, Shun, Ye, Kai, Yang, Yueheng, Chen, Yi, Zhang, Lingmin, Liu, Jingbo, Mao, Qian, Ma, Yuguang (2014) In situ Sr isotopic analyses of epidote: tracing the sources of multi-stage fluids in ultrahigh-pressure eclogite (Ganghe, Dabie terrane) Contributions to Mineralogy and Petrology, 167 (2) doi:10.1007/s00410-014-0975-9 | Journal (article/letter/editorial) | | sources of multi-stage fluids in ultrahigh-pressure eclogite (Ganghe, Dabie terrane) Shun Guo • Kai Ye • Yueheng...crystals from ultrahigh-pressure (UHP) eclogites and omphacite–epidote veins therein at Ganghe (Dabie terrane...(Ep-In) in omphacite that define the earliest stage of epidote formation in the eclogite; (2) coarse-grained...contain omphacite with Ep-In inclusions in the eclogite; (3) fine-grained HP epidote in omphacite–epidote...which crosscut the Ep-P or matrix minerals in the eclogite and HP vein. Both Ep-P and Ep-V crystals exhibit |  | Yasumoto, Atsushi, Yoshida, Kenta, Kuwatani, Tatsu, Nakamura, Daisuke, Svojtka, Martin, Hirajima, Takao (2018) A rapid and precise quantitative electron probe chemical mapping technique and its application to an ultrahigh-pressure eclogite from the Moldanubian Zone of the Bohemian Massif (Nové Dvory, Czech Republic) American Mineralogist, 103 (10) 1690-1698 doi:10.2138/am-2018-6323ccby | Journal (article/letter/editorial) | | technique and its application to an ultrahigh-pressure eclogite from the Moldanubian Zone of the Bohemian Massif...bulk compositions within an ultrahigh-pressure eclogite from Nové Dvory, Czech Republic. The studied sample...sample is a garnet-rich bimineralic eclogite that includes a 3 mm thick pyroxene-rich layer. A mapped...intruded the eclogite. Keywords: Bohemian Massif, compositional map, electron probe, eclogite, pyroxenite...applied the proposed method to an ultrahigh-pressure eclogite collected from the Moldanubian Zone of the Bohemian |  | | Journal (article/letter/editorial) | | 21 April 2004 Springer-Verlag 2004 Abstract Eclogite occurs within the southern domain of the East...the 3,000-km-long Snowbird tectonic zone. The eclogite occurs in association with a variety of lower...history from 2.6 to 1.9 Ga. Temperatures of the eclogite facies metamorphism are constrained by garnet-clinopyroxene...pargasite-plagioclase. U-Pb IDTIMS zircon geochronology of the eclogite yields a weighted mean 207Pb/206Pb date of 1,904...0±0.3 Ma, which we interpret as the time of peak eclogite facies metamorphism. SHRIMP in situ analyses of |  | | Journal (article/letter/editorial) | | for the interpretation of controversial gneiss–eclogite relationships in other UHP metamorphic terrains...have tentatively defined as the Central Dabie UHP Eclogite-Bearing Terrane Žsee Fig. 1, and Carswell et al... which shows the regional extent of a coesite–eclogite facies unit within the dominant orthogneiss lithologies...1996. have published maps for the Shuanghe UHP eclogite locality that show the eclogites interlayered...orthogneisses and UHP schists from the Central Dabie UHP eclogite-bearing terrane. 2. Field occurrences and whole |
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