 | | 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) |  | 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 |  | | 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...rocks metamorphosed to the epidote-amphibolite facies. Occurrences of eclogite rocks usually are found to...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 |  | 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) | | metamorphic belt, East China. Eclogite, gneiss, amphibolite (retrograded from eclogite), ultramafic rocks, and...quartz, kyanite, amphibole, phengite, rutile, epidote, amphibole, plagioclase, and biotite from various...rocks in the depth range of 0–3,000 m (mainly eclogite and gneiss) show that the investigated rocks can...greater than 100 km by many hydrous phases such as epidote, phengite, zoisite, serpentine, and lawsonite (e...an UHP terrain. Studies of layered rocks at the outcrop scale have demonstrated the important control of |  | | 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, which evolved from the albite–epidote amphibolite- to greenschist-facies conditions during...Alpine metamorphism in the MC developed under eclogite-facies conditions during the first Alpine metamorphic |  | | 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) | | areas, consist of garnet, omphacite, phengite, epidote, hornblendic amphibole, quartz/coesite and rutile...and formation of epidote porphyroblasts and kyanite-bearing quartz veins in eclogite. As lawsonite dehydration...corresponding to the later-stage and generally lack the epidote overprinting. This article is protected by copyright...rights reserved. Accepted Article Keywords: UHP eclogite; phase equilibria; P–T path; Dabie orogen. INTRODUCTION...diamond-bearing eclogites from the south Dabie eclogite belt (Okay et al., 1989; Wang et al., 1989; Xu |  | | 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...channel at pressures between 15 and 20 kbar, in the epidote blueschist facies. Exhumation of the underlying...During subduction and recrystallization under eclogite-facies conditions, initial hydration and subsequent...experimental work and modelling suggest that lawsonite eclogite should be the dominant rock type for a typical...In many blueschist/eclogite belts, lawsonite was in fact retrogressed to epidote-bearing rhombic shaped |  | | 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...centimeters. The persistence of hydrous minerals such as epidote and phengite approaching high temperature oxygen...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 |  | 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...followed by an increase in pressure under which the eclogite climax developed (T up to 700 °C, P = 13-15 kbar)...1976; Ghezzo et al., 1982). Since they contain eclogite-facies relics, these bodies can record both deformation...paper we describe the metamorphic evolution of the eclogite-facies rocks on the basis of a thorough geological |  | Liu, Yan, Santosh, M., Zhao, Zhong Bao, Niu, Wen Chao, Wang, Gen Hou (2011) Evidence for palaeo-Tethyan oceanic subduction within central Qiangtang, northern Tibet. Lithos, 127 (1) 39-53 doi:10.1016/j.lithos.2011.07.023 | Journal (article/letter/editorial) | | a c t The mechanism of formation of blueschist–eclogite belts and their space-time distribution are important...a matrix of fine-grained amphibole, white mica, epidote, chlorite, albite and quartz with accessory rutile...well as rhomb-shaped inclusions of paragonite and epidote which are interpreted as pseudomorphs after lawsonite...coarse-grained inclusions of epidote as well as the absence of paragonite and epidote aggregates, clearly suggesting...metamorphic transformation from lawsonite- to epidote-stability field. The Mn content of the garnet porphyroblasts |  | 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...assemblage of garnet, omphacite, glaucophane, epidote, phengite, quartz and rutile with or without paragonite...for amphibole and clinopyroxene. Garnet in the eclogite typically exhibits growth zonations in which pyrope...formed mainly in the P–T conditions of lawsonite-eclogite facies at the pre-peak stage. Omphacite shows...change involves the transformation of lawsonite to epidote, releasing large amount of water in the rock. The |  | 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) | | high-pressure fluids during retrograde metamorphism of eclogite-facies rocks ( Voltri Massif, Italian Western...re-equilibration of a fluid presumably trapped at eclogite-facies conditions. The inclusions kinetically...are retained in primary fluid inclusions within eclogite facies minerals crystallized in veins and in the...variable amounts of hydrous minerals (phengite, epidote, zoisite, amphibole, chlorite and chloritoid) in...reaction kinetics (Rubie, 1990). Fluid inclusions in eclogite-facies rocks therefore represent an important |  | 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) | | analyses of epidote: tracing the sources of multi-stage fluids in ultrahigh-pressure eclogite (Ganghe, Dabie...multi-stage epidote crystals from ultrahigh-pressure (UHP) eclogites and omphacite–epidote veins therein...of a continental crust. Four textural types of epidote that record compositional and isotopic signatures...high-pressure (HP) epidote inclusions (Ep-In) in omphacite that define the earliest stage of epidote formation...formation in the eclogite; (2) coarse-grained UHP epidote porphyroblasts (Ep-P) that contain omphacite with Ep-In |  | Liang, J.L., Ding, X., Sun, X.M., Zhang, Z.M., Zhang, H., Sun, W.D. (2009) Nb/Ta fractionation observed in eclogites from the Chinese Continental Scientific Drilling Project. Chemical Geology, 268 (1) 27-40 doi:10.1016/j.chemgeo.2009.07.006 | Journal (article/letter/editorial) | | Editor: R.L. Rudnick Keywords: Nb/Ta fractionation Eclogite Rutile Amphibole CCSD Subduction a b s t r a...detailed analyses of Nb and Ta concentrations of 19 eclogite samples and their principal mineral constituents... Amphiboles in amphibolites (retrograded from eclogite) can be classified into two groups: a low Nb/Ta...was not reported. In this paper, we studied 19 eclogite samples from 100 to 3000 m depths in the main...amphibole, phengite, garnet, omphacite, apatite and epidote) were analyzed. Our results strongly support major |  | 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...coexisting garnet and omphacite suggests that the Kotsu eclogite formed at peak temperatures of around 600 C synchronous...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) | | s 0.18–0.45. –phengite ŽSi s 3.2–3.35. –zoned epidote ŽPs 38 – 97 . –biotite–titanite–two feldspars–quartz...inclusions within titanite or epidote and relict phengite inclusions within epidote with Si contents p.f.u....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 |  | | Journal (article/letter/editorial) | | ESRF, 6 rue Jules Horowitz, BP220, 38043 Grenoble, France A. Pavese National Research Council, IDPA, Section...Synchrotron Radiation Facilities (ESRF) of Grenoble (France). The high 2h resolution and excellent counting...57Mg0.2Fe0.25) (Si3.37Al0.63)O10(OH)2 Gneiss outcrop of Ahornach (Bolzano, Alto Adige, Italy) FEMa...03Mn0.01) (Si3.45Al0.55)O10(OH)2 Metamorphic dike outcrop of Brossasco Isasca Unit, Western Alps (Italy)...09)(Al1.52Mg0.27Fe0.26) (Si3.26Al0.74)O10(OH)2 Eclogite outcrop of Vara Inferiore (Voltri Group, Italy). Bocchio |  | Berezin, A. V., Skublov, S. G., Marin, Yu. B., Mel’nik, A. E., Bogomolov, E. S. (2013) New occurrence of eclogite in the Belomorian mobile belt: Geology, metamorphic conditions, and isotope age. Doklady Earth Sciences, 448 (1) 43-53 doi:10.1134/s1028334x13010029 | Journal (article/letter/editorial) | | 1, pp. 64–75. GEOCHEMISTRY New Occurrence of Eclogite in the Belomorian Mobile Belt: Geology, Metamorphic...2012 DOI: 10.1134/S1028334X13010029 Finds of eclogitelike associations within the Belo morian mobile...Geochronology) in the 1950s. We discovered a number of new eclogite bodies on the islands of the Keretskii archipelago...represented by strongly gran itized biotite (rarely epidote) gneiss practically does not contain basic bodies... 100 km Fig. 1. Geological scheme of the eclogite outcrop on the northwestern coastal part of Sidorov |  | Wang, Song-Jie, Wang, Lu, Brown, Michael, Johnson, Tim E., Piccoli, Philip M., Feng, Peng, Wang, Zhen-Long (2020) Petrogenesis of leucosome sheets in migmatitic UHP eclogites—Evolution from silicate-rich supercritical fluid to hydrous melt. Lithos, 360. 105442 doi:10.1016/j.lithos.2020.105442 | Journal (article/letter/editorial) | | Journal Pre-proof Abstract Recent studies of eclogite in the ultrahigh pressure (UHP) zone of the central...during exhumation from the metamorphic peak to HP eclogite facies conditions. This observation requires that...sheets in retrogressed and migmatitic of UHP eclogite in the central Sulu belt. The leucosomes have...lP with modal changes in phengite and albite + epidote sensu lato. The leucosomes are enriched in large...formed a silicate-rich supercritical fluid in eclogite that evolved to a denser, 2 Journal Pre-proof |  | | Journal (article/letter/editorial) | | high metamorphic grade, including blueschist, eclogite, and amphibolite assemblages, and are typically...grade. Coherent metamorphic rocks are generally of epidote blueschist and lower grade and consist of large...and (4) white mica ages of 146.5 Ma (eclogite) and 134 Ma (epidote blueschist) from the Willow Spring slab...comprising rocks ranging from lawsonite blueschist to eclogite. We also obtained hornblende ages of about 156...equivalent to many high-grade blocks and even include eclogite assemblages. In addition to sampling coherent |  | Wu, Y.-B., Gao, S., Zhang, H.-F., Yang, S.-H., Liu, X.-C., Jiao, W.-F., Liu, Y.-S., Yuan, H.-L., Gong, H.-J., He, M.-C. (2009) U-Pb age, trace-element, and Hf-isotope compositions of zircon in a quartz vein from eclogite in the western Dabie Mountains: Constraints on fluid flow during early exhumation of ultrahigh-pressure rocks. American Mineralogist, 94 (2) 303-312 doi:10.2138/am.2009.3042 | Journal (article/letter/editorial) | | Hf-isotope compositions of zircon in a quartz vein from eclogite in the western Dabie Mountains: Constraints on...zircon grains from a quartz vein within an UHP eclogite outcrop from the Hong’an area, western Dabie Mountains...they crystallized from aqueous fluid under HP eclogite-facies conditions. The zircon grains show low...their precipitation in the presence of garnet and epidote, and absence of feldspar, and thus suggest that...have Hf compositions similar to those in the host eclogite, which demonstrates isotopic equilibrium between |  | | Journal (article/letter/editorial) | | metabasites: a case study using the Tso Morari UHP eclogite Ruiguang Pan1 · Catherine A. Macris1 · Carrie...pressure–temperature (P–T) paths of metabasites. In this paper, eclogite from the Tso Morari UHP terrane, NW India, is...Metabasites · Thermodynamic modeling · Tso Morari · UHP eclogite · P–T paths · Garnet fractionation Communicated...consideration of chemical heterogeneity (e.g., outcrop scale, mineral zoning, and relics) and definition...collected from the wellcharacterized coesite-bearing eclogite of the Tso Morari UHP terrane, in NW Himalaya |
|
