 | | Journal (article/letter/editorial) | | disordered sp3-carbon in the coesite-bearing Straumen Eclogite Pod, Norway D. C. SMITH1,2 AND G. GODARD3,4 1 Lab...in phengite–kyanite–coesite eclogite sample 62a from the Straumen Eclogite Pod in the Western Gneiss Region...Region (WGR), S.W. Norway. Graphitic carbon is always present with a degree of structural disorder comparable...rocks in general. This new locality of diamond at Straumen, the fourth in the WGR but the first in the southwestern...orthopyroxene-bearing eclogite types in the WGR. Key words: diamond; eclogite; Norway; Raman; UHPM. INTRODUCTION |  | | Journal (article/letter/editorial) | | themes discussed during the 9th International Eclogite Conference (Mariánské Lázně, Czech Republic...nanoscales. Papers presented at the 9th International Eclogite Conference (Mariánské Lázně, Czech Republic...graphitized diamond from the Straumen eclogite of Western Gneiss Region (WGR) of Norway, a Palaeozoic UHPM terrane...the same monocrystal. The finding of diamond at Straumen provides a minimum pressure estimate for UHP metamorphism...g eclogites. The authors hypothesize that the Straumen diamond was formed due to reduction of CO2, whether |  | | Journal (article/letter/editorial) | | Coesite in the Straumen kyanite-eclogite pod, Norway David C. Smith Laborntoire de MinPralogie, MusPum...coesite in the Straumen kyanite-eclogite pod in the Western Gneiss Region (WGR),Norway, is described....transformation into quartz, are similar to those described at the first coesite occurrence in Norway (the Grytting...Grytting dolomite-eclogite pod) there are some significant differences at this second locality. These include...An initial coesite-eclogite (sub)facies paragenesis was followed by a quartz-eclogite (sub)faciesparagenesis |  | Janák, M., Krogh Ravna, E. J., Kullerud, K., Yoshida, K., Milovský, R., Hirajima, T. (2013) Discovery of diamond in the Tromsø Nappe, Scandinavian Caledonides (N. Norway) Journal of Metamorphic Geology, 31 (6) 691-703 doi:10.1111/jmg.12040 | Journal (article/letter/editorial) | | the Tromsø Nappe, Scandinavian Caledonides (N. Norway) ,1 E. J. KROGH RAVNA,2 K. KULLERUD,2 K. YOSHIDA...Geology, University of Tromsø, Tromsø, N-9037, Norway 3 Department of Geology and Mineralogy, Graduate...composed essentially of garnet, biotite, white mica, quartz and plagioclase, minor constituents include kyanite...worldwide, i.e. the Western Gneiss region (WGR) in Norway (Dobrzhinetskaya et al., 1995); China (Xu et al...of the Scandinavian Caledonides in southwestern Norway, provided unequivocal evidence for © 2013 John |  | | Journal (article/letter/editorial) | | Meta-anorthosite and related jotunites, Western Gneiss Region, Norway Spencer J. Cotkin Department of Geological Sciences...Gneiss Region (WGR) of Norway, and is adjacent to the 1.52 Ga Flat&et quartz monzonite (mange&e). The...The WGR was metamorphosed to eclogite facies during Caledonian tectonism 414 &- 16 Ma ago. The Meta-anorthosite...Seljeneset rocks display evidence of retrogression from eclogite through amphibolite facies. Meta-anorthosite consists...consists of ovoidal clots of margarite, quartz, plagioclase, and relict kyanite set in a matrix of zoisite |  | | Journal (article/letter/editorial) | | High-pressure phengite decomposition in the Weissenstein eclogite, Miinchberger Gneiss Massif, Germany G. Franz...petro- genesis of a sample from the Weissenstein eclogite, Bavaria, Germany, has been investigated. The...assemblage comprises garnet, clinopyroxenei+n, quartz, amphibole~+ii, rutile, phengite, epidote/allanite...evolution of the rock. The main phengitequartz-eclogite mineral equilibration occurred at minimum P=13-17...the Weissenstein eclogite are in the same order of magnitude as those for other eclogite bodies from the |  | | Journal (article/letter/editorial) | | Song et al., 2005), the Western Gneiss Region, Norway (Dobrzhinetskaya et al., 1995; Vrijmoed et al....and C5–1) in zircon in an eclogite from the CE Western Gneiss Region, Norway: ―The fact that the diamond...strongly AC downshifted in both microinclusions at Straumen is considered to be especially important in favouring...instance the combined occurrence of microdiamond and quartz (instead of coesite), as for instance in garnet...metastable diamond formation at conditions within the quartz stability field, for instance from superdense CO2 |  | Janák, M., Froitzheim, N., Yoshida, K., Sasinková, V., Nosko, M., Kobayashi, T., Hirajima, T., Vrabec, M. (2015) Diamond in metasedimentary crustal rocks from Pohorje, Eastern Alps: a window to deep continental subduction. Journal of Metamorphic Geology, 33 (5) 495-512 doi:10.1111/jmg.12130 | Journal (article/letter/editorial) | | Cretaceous metamorphism up to greenschist facies, eclogite facies metamorphic rocks of Cretaceous age occur...Fodor et al., 2003; Kirst et al., 2010). Numerous eclogite bodies, partly amphibolitized, occur in the southeastern...Uher et al., 2014). The Late Cretaceous age of eclogite facies metamorphism in the Pohorje nappe is documented...et al., 2009). Similar ages were determined for eclogite facies metamorphism in the Koralpe and Saualpe...determined HP conditions in the quartz stability field for their eclogite samples and stated that the high-P |  | | Journal (article/letter/editorial) | | pre-conference field excursion of the 10th International Eclogite Conference to the Erzgebirge terrane of the Saxothuringian...high-grade metamorphic rocks: (a) mica-schist–eclogite INTERNATIONAL GEOLOGY REVIEW N 14 o E 12 o...granulite, and other UHP rocks (garnet peridotite, and eclogite) recovered from boreholes T-7 and T-38 (50°28...grey gneiss unit, and (c) gneiss–eclogite unit. The gneiss–eclogite unit in the core of the Erzgebirge...identified in the SE and SW areas of the mica-schist–eclogite (Kotkova et al. 2011; Medaris et al. 2015). They |  | Korsakov, Andrey V., Zhimulev, Egor I., Mikhailenko, Denis S., Demin, Sergey P., Kozmenko, Olga A. (2015) Graphite pseudomorphs after diamonds: An experimental study of graphite morphology and the role of H2O in the graphitisation process. Lithos, 236. 16-26 doi:10.1016/j.lithos.2015.08.012 | Journal (article/letter/editorial) | | octahedral crystals occur in clinozoisite gneisses and quartz–tourmaline–muscovite metasomatic rocks (Korsakov...D., Liu, Z., Green, H.W., 2009. Phlogopite and quartz lamellae in diamond-bearing diopside from marbles...the tromsø nappe, Scandinavian caledonides (N. Norway). Journal of Metamorphic Geology 31, 691–703. Katayama...A comparison of the evolution of diamondiferous quartz-rich rocks from the Saxonian Erzgebirge and the...Ogasawara, Y., 2000. Petrology of the diamond-grade eclogite in the Kokchetav Massif, northern Kazakhstan. |  | Klonowska, I., Janák, M., Majka, J., Petrík, I., Froitzheim, N., Gee, D. G., Sasinková, V. (2017) Microdiamond on Åreskutan confirms regional UHP metamorphism in the Seve Nappe Complex of the Scandinavian Caledonides. Journal of Metamorphic Geology, 35 (5) 541-564 doi:10.1111/jmg.12244 | Journal (article/letter/editorial) | | phengite + kyanite + rutile, with polycrystalline quartz surrounded by radial cracks indicating breakdown...garnet+biotite+ plagioclase+K-feldspar+sillimanite+ilmenite+quartz. This overprint was the result of nearly isothermal...isothermal decompression, which is corroborated by Ti-in-quartz thermometry. Chemical Th-U-Pb dating of monazite...mineral assemblages that do not correspond to the eclogite facies but record lower pressure conditions. Often...garnet formed in quartzofeldspathic rocks under eclogite facies conditions may survive even severe retrogression |  | | Journal (article/letter/editorial) | | MINERALS IN ECLOGITES FROM THE WESTERN GNEISS REGION, NORWAY 1. Petrology of the Oxide Microassemblages M I...minerals in eclogites from the Western Gneiss Region, Norway, 1. Petrology of the oxide microassemblages. In:...from ten different eclogite pods in the Western Gneiss Region of southern Norway have been examined by...ilmenite and rutile, as oxide phases stable in eclogite-facies parageneses in appropriate local bulk-rock...initial eclogite-facies equilibration; (f) further petrological evidence to distinguish the eclogite pods |  | DesOrmeau, Joel W., Gordon, Stacia M., Kylander-Clark, Andrew R.C., Hacker, Bradley R., Bowring, Samuel A., Schoene, Blair, Samperton, Kyle M. (2015) Insights into (U)HP metamorphism of the Western Gneiss Region, Norway: A high-spatial resolution and high-precision zircon study. Chemical Geology, 414. 138-155 doi:10.1016/j.chemgeo.2015.08.004 | Journal (article/letter/editorial) | | (U)HP metamorphism of the Western Gneiss Region, Norway: A high-spatial resolution and high-precision zircon...(U)HP metamorphism of the Western Gneiss Region, Norway: A high-spatial resolution and high-precision zircon...(U)HP metamorphism of the Western Gneiss Region, Norway: A high-spatial PT resolution and high-precision...spectrometry; AC CE P TE D MA NU SC RI PT Norway; Ultrahigh-pressure metamorphism 2 ACCEPTED...Western Gneiss Region of Norway. Zircons were extracted from a layered eclogite in the SC Saltaneset |  | | Journal (article/letter/editorial) | | Smith et al., 2011); the Western Gneiss Region, Norway (Dobrzhinetskaya et al., 1995; van Roermund et...lawsonite–blueschist facies (Combin Zone) and eclogite facies (Zermatt–Saas Zone) Alpine metamorphic...(7) Coesite- eclogite and metasediment (Lago di Cignana Unit); (8) Zermatt–Saas Zone eclogite and metagabbro...manganiferous garnetites consist, in addition to quartz and garnet (>80% in vol.), of minor phengite, partly...and accessory rutile and apatite. Thin films of quartz between garnet granoblasts occur locally. The original |  | Petrík, I., Janák, M., Froitzheim, N., Georgiev, N., Yoshida, K., Sasinková, V., Konečný, P., Milovská, S. (2016) Triassic to Early Jurassic (c. 200 Ma) UHP metamorphism in the Central Rhodopes: evidence from U-Pb-Th dating of monazite in diamond-bearing gneiss from Chepelare (Bulgaria) Journal of Metamorphic Geology, 34 (3) 265-291 doi:10.1111/jmg.12181 | Journal (article/letter/editorial) | | only indirect evidence for UHPM such as inferred quartz pseudomorphs after coesite, rods of silica suggesting...Thermobarometric evidence for UHPM comes from kyanite eclogite in the Pirin Mts. (Fig. 1), which has preserved...tendency of zircon to dissolve at the amphibolite/eclogite transition before UHPM, and its growth during...metamorphism in the Kechros-Byala Reka Dome reached eclogite facies and was overprinted by lower amphibolite...Ma from eclogite near Sidironero (Liati, 2005), Lu–Hf garnet ages of 45–42 Ma from eclogite at the northern |  | | Journal (article/letter/editorial) | | occurrence of quartz needles in Mn-rich fayalite. From textural characteristics, we infer that the quartz needles...incorporate excess silica. We therefore speculate these quartz needles may be silica that exsolved from Mn-rich...(Ol)garnet (Grt)-clinopyroxene (Cpx)-orthopyroxene (Opx)-quartz (Qtz) gneisses with graphite (Gph), magnetite (Mag)...distributions from the Western Gneiss Region of Norway (KonradSchmolke et al. 2008), Himalayan majorites...this rock, and consistently are in contact with quartz. These groundmass olivines occasionally have sets |  | Gordon, Stacia M., Whitney, Donna L., Teyssier, Christian, Fossen, Haakon (2013) U–Pb dates and trace-element geochemistry of zircon from migmatite, Western Gneiss Region, Norway: Significance for history of partial melting in continental subduction. Lithos, 170. 35-53 doi:10.1016/j.lithos.2013.02.003 | Journal (article/letter/editorial) | | of zircon from migmatite, Western Gneiss Region, Norway: Significance for history of partial melting in...of Earth Science, University of Bergen, Bergen, Norway a r t i c l e i n f o Article history: Received...online 16 February 2013 Keywords: Partial melting Eclogite U–Pb geochronology Trace elements Western Gneiss...Region (WGR), Norway, is dominated by migmatitic gneiss that contains inclusions of eclogite, some of which...and age relationships between host migmatite and eclogite, we obtained LA–ICP–MS U–Pb dates and trace-element |  | Shumilova, Tatyana G., Isaenko, Sergey I., Ulyashev, Vasily V., Kazakov, Valery A., Makeev, Boris A. (2018) After-coal diamonds: an enigmatic type of impact diamonds. European Journal of Mineralogy, 30 (1) 61-76 doi:10.1127/ejm/2018/0030-2715 | Journal (article/letter/editorial) | | and graphitic-siliceous shales with sublayers of quartz-containing limestones. The D2–D3 sediments of 700–900...of micro- and macrogeodes filled by calcite and quartz. The suevite matrix consists predominantly of carbonate...disordered sp3-carbon in the coesite-bearing Straumen Eclogite Pod, Norway. J. metamorphic Geol., 31, 19–33. Trieloff |  | Xiong, Fahui, Liu, Zhao, Kapsiotis, Argyrios, Yang, Jingsui, Lenaz, Davide, Robinson, Paul T. (2019) Petrogenesis of lherzolites from the Purang ophiolite, Yarlung-Zangbo suture zone, Tibet: origin and significance of ultra-high pressure and other ‘unusual’ minerals in the Neo-Tethyan lithospheric mantle. International Geology Review, 61 (17) 2184-2210 doi:10.1080/00206814.2019.1584771 | Journal (article/letter/editorial) | | zircons, K-feldspar, plagioclase, kyanite, garnet or quartz; Robinson et al. 2015). Various scenarios have...detachment of a dense lithospheric slab undergoing eclogite-facies metamorphism as it is subducted deep into...serpentine, chlorite, ilmenite, pyrophanite and quartz, filling sealed micro-fractures in Cr-spinel grains...than −1.1 log units above the fayalitemagnetite-quartz (FMQ) buffer (Parkinson and Pearce 1998), making...and sp3-carbon in the coesite-bearing Straumen Eclogite Pod, Norway: Journal of Metamorphic Geology, v. |
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