 | | 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 |  | | 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...amounts of hydrous minerals (phengite, epidote, zoisite, amphibole, chlorite and chloritoid) in apparent...reaction kinetics (Rubie, 1990). Fluid inclusions in eclogite-facies rocks therefore represent an important |  | | 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 |  | Miller, C., Thöni, M., Konzett, J., Kurz, W., Schuster, R. (2005) Eclogites from the Koralpe and Saualpe type-localities, Eastern Alps, Austria. Mitteilungen der Ăsterreichischen Mineralogischen Gesellschaft, 150. | Journal (article/letter/editorial) | | 590 °C at 250-270 Ma; HABLER & THĂNI, 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...and contain garnet, omphacite, quartz, kyanite, zoisite/clinozoisite, rutile, apatite, zircon, phengite...the foliation defined by omphacite ± kyanite and zoisite. Retrogression is documented by (1) omphacite rimmed |  | | Journal (article/letter/editorial) | | in Austria Petrologic Constraints for Eoalpine Eclogite Facies Metamorphism in the Austroalpine Otztal...(Jd4o), garnet II (Gr2o-3o PYl0), phengite (Si3.s), zoisite, futile and quartz. Al-pargasite (~20 wt% A1203)...retrograde reaction products. Retrogression of the eclogite parageneses reflecting decreasing pressure and...Minimum pressure and temperature conditions of the eclogite stage derived from Jd-content in omphacite and...southern CItztal basement after the eclogite stage. The age of the eclogite stage is interpreted as Eoalpine |  | | 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 |  | | Journal (article/letter/editorial) | | metamorphic belt, East China. Eclogite, gneiss, amphibolite (retrograded from eclogite), ultramaïŹc rocks, and...rocks in the depth range of 0â3,000 m (mainly eclogite and gneiss) show that the investigated rocks can...GoÌttingen, Goldschmittstrasse 1, 37077 Gottingen, Germany E-mail: yxiao@gwdg.de Tel.: +49-551-395253 Fax:...many hydrous phases such as epidote, phengite, zoisite, serpentine, and lawsonite (e.g., Thompson 1992)...an UHP terrain. Studies of layered rocks at the outcrop scale have demonstrated the important control of |  | | Journal (article/letter/editorial) | | porphyroblasts and kyanite-bearing quartz veins in eclogite. As lawsonite dehydration can facilitate evolution...rights reserved. Accepted Article Keywords: UHP eclogite; phase equilibria; PâT path; Dabie orogen. INTRODUCTION...diamond-bearing eclogites from the south Dabie eclogite belt (Okay et al., 1989; Wang et al., 1989; Xu...739â866°C. Garnet peridotites in the south Dabie eclogite belt were also estimated to yield higher pressures...the Bixiling area, which are interlayered with eclogite, were interpreted to originate from accumulation |  | 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...pre(?)-eclogite stage is documented by inclusions of euhedral tschermakitic amphibole + zoisite within...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 |  | | Journal (article/letter/editorial) | | q 3 grossularq 2SiO 2 q H 2 O s 5 titaniteq 2 zoisite equilibria indicate that the orthogneisses may...for the interpretation of controversial gneissâeclogite relationships in other UHP metamorphic terrains...have tentatively defined as the Central Dabie UHP Eclogite-Bearing Terrane Ćœsee Fig. 1, and Carswell et al... which shows the regional extent of a coesiteâeclogite facies unit within the dominant orthogneiss lithologies...1996. have published maps for the Shuanghe UHP eclogite locality that show the eclogites interlayered |  | | Journal (article/letter/editorial) | | 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...by Tsujimori et al., 2006). In many blueschist/eclogite belts, lawsonite was in fact retrogressed to epidote-bearing...TĂ€sch areas). All three areas show the stacking of eclogite-facies nappes over a thick serpentinite sole.Map...abundance (vol.%) Ave. H2O (vol.%) in eclogites Ave. eclogite density Ave. slice density 400â500 200â300 250â350 |  | | 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 BÄstvina Unit. Eclogites...preserve relict mineral assemblage from a pre-eclogite stage, enclosed in garnet with prograde zoning...kyanite eclogite from Ăhrov (Medaris et al. 2006), 800â850 °C and 1.7â1.9 GPa for SpaÄice eclogite, 1160â1180...1160â1180 °C a 1.7â1.9 GPa for the quartz-rich eclogite, and 960 °C a 1.9 GPa for other eclogites. Faryad |  | 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 eclogitesâEvolution 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...formed a silicate-rich supercritical fluid in eclogite that evolved to a denser, 2 Journal Pre-proof...possibly by diffusive loss of water to the host eclogite. Infiltration of solute-rich supercritical fluid |  | | Journal (article/letter/editorial) | | Abstract The Western Gneiss Region ĆœWGR. marks the outcrop of a composite terrane consisting of variably re-worked...respectively, in line with the distribution of eclogite petrographic features. Results are usually consistent...Elsevier Science B.V. All rights reserved. Keywords: Eclogite; Western Gneiss Region; Norwegian Caledonides...coesite, Smith Ćœ1988. established a ââcoesiteâeclogite provinceââ in the Stadlandet area of coastal SW...were able to map a boundary zone to the coesiteâeclogite province, distinguishing a group of UHP eclogites |  | | Journal (article/letter/editorial) | | 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...05Fe3+0.03Ti0.02) (Si3.48Al0.52)O10(OH)2 Eclogite outcrop from Brossasco Isasca Unit, Western Alps (Italy)...03Mn0.01) (Si3.45Al0.55)O10(OH)2 Metamorphic dike outcrop of Brossasco Isasca Unit, Western Alps (Italy) |  | 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 â 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 ïŹ paragonite and amphibole in matrix |  | 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 âą Kai Ye âą Yueheng...the earliest stage of epidote formation in the eclogite; (2) coarse-grained UHP epidote porphyroblasts...contain omphacite with Ep-In inclusions in the eclogite; (3) fine-grained HP epidote in omphaciteâepidote...which crosscut the Ep-P or matrix minerals in the eclogite and HP vein. Both Ep-P and Ep-V crystals exhibit...which enclose the UHP eclogite. These data indicate different sources of the eclogite-facies fluids and retrograde |  | Butler, J.P., Jamieson, R.A., Dunning, G.R., Pecha, M.E., Robinson, P., Steenkamp, H.M. (2018) Timing of metamorphism and exhumation in the NordĂžyane ultra-high-pressure domain, Western Gneiss Region, Norway: New constraints from complementary CA-ID-TIMS and LA-MC-ICP-MS geochronology. Lithos, 310. 153-170 doi:10.1016/j.lithos.2018.04.006 | Journal (article/letter/editorial) | | (WGR) of Norway. The dated samples include T 4 eclogite bodies, 2 host-rock migmatites, and 2 cross-cutting...from the island of HarĂžya. Zircon from a coesite eclogite yielded an age of ca. 413 Ma, CR interpreted...in this sample. Zircon data from the other US eclogite bodies yielded metamorphic ages of ca. 413 Ma...with 413 Ma and 407 Ma ages are consistent with eclogite-facies AN crystallization. In all of the eclogites...western part of the area. Migmatites hosting the eclogite bodies yielded zircon core ages of ca. 1657â1591 |  | 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 Hongâan area, western Dabie Mountains...they crystallized from aqueous fluid under HP eclogite-facies conditions. The zircon grains show low...have Hf compositions similar to those in the host eclogite, which demonstrates isotopic equilibrium between...sign of fluid flow, and are commonly found in eclogite-facies rocks (Liati and Gebauer 1999; Rubatto |  | Tan, Zhou, Agard, Philippe, Gao, Jun, John, Timm, Li, JiLei, Jiang, Tuo, Bayet, LĂ©a, Wang, XinShui, Zhang, Xi (2017) PâTâtime-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;...Malteserstr. AC c. 74â100, D-12449, Berlin, Germany f. Laboratory of Isotope Geochemistry, Wuhan Centre...coesite-bearing ED eclogite samples from a thick (~ 5 meters) layered metabasalt outcrop in order to PT...GPa, 540 ± 20 â at 316.8 ± 0.8 Ma, then, with eclogite-facies deformation ~ 2.0 ± 0.15 GPa, 525 ± 25...Samples come from a thick (~ PT 5m) layered eclogite outcrop close to where UHP was previously reported |  | 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 PâT 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...signiïŹcant differences in oxygen fugacity of the eclogite reïŹected in mineral chemistries. The peak pressure...history recorded by the eclogite, and the composition of omphacite in associated eclogite facies pelitic schist |  | Cheng, Hao, Zhang, Chao, Vervoort, Jeffrey D., Lu, Honghua, Wang, Chao, Cao, Dadi (2012) Zircon UâPb and garnet LuâHf geochronology of eclogites from the Lhasa Block, Tibet. Lithos, 155. 341-359 doi:10.1016/j.lithos.2012.09.011 | Journal (article/letter/editorial) | | 2012 Available online 2 October 2012 Keywords: Eclogite Geochronology Lhasa LuâHf UâPb Tibet a b s t...this area. A quartzite, together with its host eclogite from the Jilang County in the Lhasa Block of northern...UâPb geochronology. The composition of the Jilang eclogite is similar to supra-subduction-zone basalts found...the Jilang eclogite most likely reïŹects garnet growth and is interpreted to reïŹect eclogiteâfacies metamorphism...MSWD = 1.1, n = 11) for the magmatic cores of the eclogite suggest that the detrital zircon in quartzite |  | | Journal (article/letter/editorial) | | (Italy), serpentinized ultramaÂźtes host bodies of eclogite, metarodingite and Ti-clinohumite  Ti-chondrodite-bearing...convergence and in many instances recrystallized at eclogite-facies conditions (Droop et al. 1990). Geological...petrological background The Voltri Massif is a nappe of eclogite-facies meta-ophiolites and associated metasediments...dikelets studied belong to the Beigua unit and outcrop near the villages of Vara and Piampaludo (Fig....aring assemblage has been shown to develop at eclogite-facies conditions and represents the highest metamorphic |  | 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 blueschistâeclogite belts and their space-time distribution are important...and 490 °C (lawsonite eclogite ïŹeld) to about 1.68 GPa and 535 °C (epidote eclogite ïŹeld), marking an initial...(Fig. 1). The widespread occurrence of blueschistâeclogite rocks in this region suggests that the central...schist, marble, quartzite, pillow basalt, gabbro, eclogite, garnet blueschists, garnet amphibolite and minor..., 2006b). Recent LuâHf isotopic dating of the eclogite from Gemo area within this belt (Fig. 1) yielded |  | | Book (edition) | | Mineralogy Geochemistry Albertstr. 23 B 79104 Freiburg Germany bucher@uni-freiburg.de Prof. Rodney Grapes Department...Earth and Planetary Science Letters. Freiburg, Germany Seoul, South Korea November 2010 Kurt Bucher Rodney.... . . . . . . . . . . . . . . . . . . . . 9.8 Eclogite Facies Metamorphism . . . . . . . . . . . . ..... . . . . . . . . . . . . . . . . . . . 9.8.3 Eclogite Facies in Gabbroic Rocks . . . . . . . . . . ... . . . . . . . . . . . . . . . . . . . 10.3.4 Eclogite and Blueschist Facies Granitoids . . . . . . |
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