 | | Journal (article/letter/editorial) | | factor for omphacite destabilization into symplectite in the eclogites of Vårdalsneset (WGR, Norway) Céline...plagioclase + diopside ± amphibole as replacement of omphacite are commonly found in eclogites. These symplectites...clearly established. In the Vårdalsneset outcrop of the Western Gneiss Region (Norway), eclogites that were...(garnet + omphacite + rutile ± quartz) or a paragenesis including phengite. In the last case, omphacite is partly...(1996) observed fluid inclusions in precursor omphacite crystals and assumed that this fluid contributed |  | | Report (chapter) | | in the eclogites from the Western Gneiss Region (Norway) CÉLINE MARTIN1,2 1 Department of Geography and...+ Ca-pyroxene (±amphibole) intergrowths after omphacite, and kelyphite, defined as amphibole + plagioclase...with well-developed symplectite, when the former omphacite is totally transformed into symplectite. These...around the world (e.g. Western Gneiss Region (WGR), Norway; Voltri, Italy; Bohemian Massif, Czech Republic;...the destabilization of the jadeite component of omphacite and consist of calcic clinopyroxene and sodic |  | Cheng, H., Vervoort, J. D., Li, X., Zhang, C., Li, Q., Zheng, S. (2011) The growth interval of garnet in the UHP eclogites from the Dabie orogen, China. American Mineralogist, 96 (8) 1300-1307 doi:10.2138/am.2011.3737 | Journal (article/letter/editorial) | | geochronology. The unzoned zircon rims have garnet and omphacite inclusions and show weak cathodoluminescence,...with older ages by the occurrence of garnet and omphacite inclusions. Well-preserved prograde major- and...6 Ma (Ayers et al. 2002) and a garnet- 1301 omphacite-rutile Sm-Nd isochron of 226.3 ± 3.2 Ma (Li et...within biotite gneisses and consists of garnet, omphacite, quartz, clinozoisite, paragonite, minor kyanite...ranges up to ~2 mm in diameter (Fig. 2a). Matrix omphacite forms subhedral or irregular grains ~0.2 to 0 |  | Cheng, Hao, Zhang, Chao, Vervoort, Jeffrey D., Wu, Yuanbao, Zheng, Yongfei, Zheng, Shu, Zhou, Zuyi (2011) New Lu–Hf geochronology constrains the onset of continental subduction in the Dabie orogen. Lithos, 121 (1) 41-54 doi:10.1016/j.lithos.2010.10.004 | Journal (article/letter/editorial) | | eclogite-facies conditions due to the occurrence of omphacite inclusions from core to rim. Taking the spherical...particular metamorphic conditions, such as garnet + omphacite for eclogites, promise to be more robust and straightforward...assemblages. They are composed mainly of garnet, omphacite, amphibole, phengite and quartz, with minor epidote...mineral assemblages, consisting mainly of garnet, omphacite, amphibole and phengite, with minor epidote and...size, and have quartz, epidote, amphibole, and omphacite inclusions (Fig. 2a, c, e). Most large garnet |  | | Journal (article/letter/editorial) | | and gabbro enclaves in the Western Gneiss Region, Norway: indications of incomplete transition at high pressure...Geologi, University of Oslo, Blindern 0316, Oslo, Norway (Received 15 April 1999; accepted 17 February...2000) Abstract – The Western Gneiss Region of Norway is a continental terrane that experienced Caledonian...pressures higher than other metastable domains in Norway. Late-Caledonian amphibolite-facies retrogression...In our study area (the Western Gneiss Region of Norway) there is no field evidence, such as steep shear |  | | Journal (article/letter/editorial) | | (XGrs up to 0.30, XPrp up to 0.25) + Na-rich omphacite (up to 44 mol % of jadeite) + rutile + quartz...thermally-driven development of symplectitic aggregate after omphacite. Amphibole compositions together with the zoisite...fresh eclogites, while symplectitic (i.e., with omphacite completely replaced by clinopyroxene/amphibole...calculation of mineral structural formulae for garnet, omphacite, and zoisite was undertaken using the CALCMIN...garnet (generally within 50–200 µm in size), omphacite and/or fine-grained plagioclase + diopside ± amphibole |  | | Journal (article/letter/editorial) | | eclogite facies orogenic root (Western Gneiss Region, Norway) Short title: H-T equilibration of eclogite orogenic...Lutro Geological Survey of Norway, P.O. Box 6315 Sluppen, 7491-Trondheim, Norway *corresponding author:...northwestern-most part of the Western Gneiss Region, South Norway. The garnet-clinopyroxene rocks occur as lenses...2008). The Western Gneiss Region (WGR) of south Norway is famous for its preserved HP and UHP eclogites...Article 2 | GEOLOGICAL SETTING The WGR of south Norway (Figure 1) forms a large gneiss terrane of Proterozoic |  | | Report (chapter) | | defined based on the coexistence of garnet II and omphacite (+epidote I, phengite I with Si = 3.3 apfu, Na-...rutile and quartz; Hyppolito et al. 2016). Rare omphacite inclusions, now mostly replaced by diopside and...albite, can be observed within garnet mantles. Omphacite inclusions with high Jd content (up to XJd45)...the replacement of omphacite by diopside + albite ± hornblende, and garnet– omphacite–rutile–quartz assemblage...image of sample #217a, showing darker relicts of omphacite (see dotted line) rimmed by hornblende in an albite-rich |  | Janots, Emilie, Austrheim, Håkon, Spandler, Carl, Hammerli, Johannes, Trepmann, Claudia A., Berndt, Jasper, Magnin, Valérie, Kemp, Anthony I.S. (2018) Rare earth elements and Sm-Nd isotope redistribution in apatite and accessory minerals in retrogressed lower crust material (Bergen Arcs, Norway) Chemical Geology, 484. 120-135 doi:10.1016/j.chemgeo.2017.10.007 | Journal (article/letter/editorial) | | retrogressed lower crust material (Bergen Arcs, Norway) E. Janots, H. Austrheim, C. Spandler, J. Hammerli...retrogressed lower crust material (Bergen Arcs, Norway). The address for the corresponding author was...retrogressed lower crust material (Bergen Arcs, Norway) E. Janots1,4, H. Austrheim2, C. Spandler3, J...janots@univ-grenoble-alpes.fr University of Oslo, Oslo, Norway 3 James Cook University, Townsville, Australia... ACCEPTED MANUSCRIPT ABSTRACT In the Bergen Arcs (Norway), Grenvillian granulite retrogressed under eclogite- |  | Schmädicke, Esther, Will, Thomas M., Ling, Xiaoxiao, Li, Xian-Hua, Li, Qiu-Li (2018) Rare peak and ubiquitous post-peak zircon in eclogite: Constraints for the timing of UHP and HP metamorphism in Erzgebirge, Germany. Lithos, 322. 250-267 doi:10.1016/j.lithos.2018.10.017 | Journal (article/letter/editorial) | | fluid inclusions or structural water in CE omphacite and garnet). The new and former age data can best...metamorphism is constrained by a Sm-Nd whole rock-garnet-omphacite three-point isochron for an AC eclogite (Schmädicke...respect to mineral assemblage and texture. Garnet, omphacite (or jadeite) and a SiO2-phase (quartz and/or coesite)...in the average grain size. Average garnet and omphacite grain diameters range from 1-2 mm in Unit 1, c... PT in textural equilibrium with garnet and omphacite. In addition, paragonite occurs as CE prograde |  | Wang, L., Wang, S.-J., Brown, M., Zhang, J.-F., Feng, P., Jin, Z.-M. (2018) On the survival of intergranular coesite in UHP eclogite. Journal of Metamorphic Geology, 36 (2) 173-194 doi:10.1111/jmg.12288 | Journal (article/letter/editorial) | | and measured the amount of water in garnet and omphacite in these samples, and also in two samples of phengite-bearing...infiltration at low temperatures. Garnet and omphacite are important nominally anhydrous minerals (NAMs)...measured structural water contents of garnet and omphacite from different eclogite types, to determine why...large garnet embedded in an equigranular garnet–omphacite matrix occur as lenses in a garnet peridotite...eclogite has an assemblage of garnet (40–45 vol.%) + omphacite (45–50 vol.%) + coesite/quartz (~5–10 vol.%) + |  | Liu, Yung-Hsin, Yang, Huai-Jen, Takazawa, Eiichi, Satish-Kumar, Madhusoodhan, You, Chen-Feng (2015) Decoupling of the Lu–Hf, Sm–Nd, and Rb–Sr isotope systems in eclogites and a garnetite from the Sulu ultra-high pressure metamorphic terrane: Causes and implications. Lithos, 234. 1-14 doi:10.1016/j.lithos.2015.07.013 | Journal (article/letter/editorial) | | Most researchers considered the Sm–Nd garnet–omphacite isochron ages of 209–246 Ma, (Chavagnac and Jahn..., 2008; Zhao et al., 2006), the Rb–Sr garnet–omphacite– phengite isochron ages of 208–238 Ma (Chavagnac...metamorphic events are consistent with the garnet–omphacite Sm–Nd and Lu–Hf ages (Cheng et al., 2008; Schmidt...of the CCSD site mainly consist of garnet and omphacite with accessory rutile (1–4 vol.%) and amphibole...(~80%) and Fe–Ti oxides (~17%), for the absence of omphacite and for the presence of b 3% of amphibole, rutile |  | | Journal (article/letter/editorial) | | Titanite and rutile ages of the Western Gneiss Region, Norway A.R.C. Kylander-Clark ⁎, B.R. Hacker, J.M. Mattinson...titanite rutile geochronology ultrahigh-pressure Norway A B S T R A C T U–Pb ages of titanite and rutile...obtained from the central Western Gneiss Region, Norway, to assess the style and timing of exhumation and...Introduction The Western Gneiss Region (WGR) of western Norway has long been a primary location for the study...531–540 Fig. 1. Western Gneiss Region, western Norway, showing approximate peak temperatures and the |  | Guo, Shun, Yang, Yueheng, Chen, Yi, Su, Bin, Gao, Yijie, Zhang, Lingmin, Liu, Jingbo, Mao, Qian (2016) Grain-scale Sr isotope heterogeneity in amphibolite (retrograded UHP eclogite, Dabie terrane): Implications for the origin and flow behavior of retrograde fluids during slab exhumation. Lithos, 266. 383-405 doi:10.1016/j.lithos.2016.10.014 | Journal (article/letter/editorial) | | The eclogite 09HLT10 predominantly consists of omphacite (30 vol.%), garnet (26 vol.%), and epidote (17...(up to a centimeter in length) in a matrix of omphacite, garnet, and quartz (Fig. 3a, b). The Ep-E contains...contains a multitude of fine-grained inclusions of omphacite, garnet, rutile, and AC radial ―palisade‖ quartz...(coesite pseudomorph) (Table 2; Fig. 3a, b). Matrix omphacite is rimmed by fine-grained symplectites of amphibole+plagioclase...sizes of 0.3-3 mm contain inclusions of Ep-E, omphacite, and garnet. Fine-grained matrix apatite (< 100 |  | Wang, S.-J., Wang, L., Brown, M., Piccoli, P. M., Johnson, T. E., Feng, P., Deng, H., Kitajima, K., Huang, Y. (2017) Fluid generation and evolution during exhumation of deeply subducted UHP continental crust: Petrogenesis of composite granite-quartz veins in the Sulu belt, China. Journal of Metamorphic Geology, 35 (6) 601-629 doi:10.1111/jmg.12248 | Journal (article/letter/editorial) | | example, the H2O concentrations in garnet and omphacite from UHP This article is protected by copyright...at Yangkou (2500 ppm in garnet and 3500 ppm in omphacite), ~2 km to the north of the study area, provide...been argued to facilitate destabilization of omphacite to form symplectite without any requirement of...amphibolite facies retrogression, where garnet, omphacite and phengite are almost entirely replaced by various...comprise either hornblende+plagioclase after omphacite, or hornblende+plagioclase + opaque oxide after |  | Ganzhorn, A. C., Labrousse, L., Prouteau, G., Leroy, C., Vrijmoed, J. C., Andersen, T. B., Arbaret, L. (2014) Structural, petrological and chemical analysis of syn-kinematic migmatites: insights from the Western Gneiss Region, Norway. Journal of Metamorphic Geology, 32 (6) 647-673 doi:10.1111/jmg.12084 | Journal (article/letter/editorial) | | migmatites: insights from the Western Gneiss Region, Norway. A.C. GANZHORN,1,2,3,4,5 L. LABROUSSE,1,2 G. PROUTEAU...of Oslo, P.O. Box 1048 Blindern, N-0316, Oslo, Norway. Running title: Chemical, petrological and structural...(WGR) in the core of the Caledonian orogen, Western Norway and the dynamic significance of melting for the...2003). Eclogite facies rocks contain garnet, omphacite, orthopyroxene, phengite, kyanite, rutile, quartz...facies paragenesis in the mafic lens is garnet + omphacite + quartz ± epidote. Biotite and white mica are |  | Spruzeniece, L., Piazolo, S., Daczko, N. R., Kilburn, M. R., Putnis, A. (2017) Symplectite formation in the presence of a reactive fluid: insights from hydrothermal experiments. Journal of Metamorphic Geology, 35 (3) 281-299 doi:10.1111/jmg.12231 | Journal (article/letter/editorial) | | REFERENCES Anderson, E. D. & Moecher, D. P. , 2007. Omphacite breakdown reactions and relation to eclogite exhumation...factor for omphacite destabilization into symplectite in the eclogites of Vårdalsneset (WGR, Norway). Lithos |  | | Journal (article/letter/editorial) | | provide statistically meaningful garnet-whole rock-omphacite isochron ages, this is often ascribed to contamination...conductivity of wadsleyite Coexisting jadeite and omphacite in metabasites from the Escambray Massif, Cuba...Gavilanes nappe characterized by both jadeite and omphacite in the same rock. Although compositions are variable...augite topotactically replaced by omphacite and jadeite. The omphacite is "P-type" (ordered) and shows...Three types of jadeite-omphacite intergrowths can be identified: l) jadeite + omphacite + pumpellyite + chlorite |
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