| | Journal (article/letter/editorial) | Metamorphosed Dunite-Harzburgite Complex in the Chugoku District, Western Japan Shoji Arai Geological Institute...Faculty of Science, University of Tokyo, Tokyo, Japan Received January 16, 1975 / Accepted June 3, 1975...1975 Abstract. The Tari-Misaka ultramafic complex, which is emplaced into the Paleozoic sediments and...Petrological and mineralogical characters of the ultramafic rocks can be well explained by thermal metamorphism...pressures (< 3kb). Introduction M a n y Alpine-type ultramafic complexes occur in the Paleozoic formations of | | Matsukage, K. N., Kikuchi, S., Ono, S., Nishihara, Y., Kikegawa, T. (2010) Density and seismic velocities of chromitite body in oceanic mantle peridotite. American Mineralogist, 95 (10) 1422-1428 doi:10.2138/am.2010.3498 | Journal (article/letter/editorial) | University, 2-5 Bunkyo-cho, Matsuyama, Ehime 790-8577, Japan 2 Department of Earth Sciences, Ibaraki University...Mito, Ibaraki 310-0056, Japan 3 Institute for Research on Earth Evolution, Japan Marine Science and Technology... 2-15 Natsushima, Yokosuka, Kanagawa 237-0061, Japan 4 Senior Research Fellow Center, Ehime University...790-8577, Japan 5 High Energy Accelerator Research Organization, Tsukuba, Ibaraki 305-0801, Japan 1 abstract...and the xenolith from Takashima in the Southwest Japan Arc (Arai and Abe 1994), respectively. The Fo content | | | Journal (article/letter/editorial) | Sciences, Kanazawa University, Kanazawa 920-1192, Japan * Corresponding author NU e-mail: ultrasa@staff...orthopyroxene, as the primary liquidus field of forsterite expands relative to that of diopside with decreasing...pressure, similar to the enstatite field in the forsteriteâdiopsideâsilica system (e.g., Kushiro, 1969)...with a Cr# of <0.6 (e.g., the Tari-Misaka chromitites, southwestern Japan; Arai and Yurimoto, 1994) originated...stratigraphy and petrogenesis of NU the Oman ophiolite complex. Contributions to Mineralogy and Petrology 81, | | | Journal (article/letter/editorial) | Kanazawa University, Kakuma, Ishikawa 920-1192, Japan, 2National Institute of Geological Sciences, University...from the Coto Block of the Zambales Ophiolite Complex, the Philippines. The dunite/ chromitite boundary...from the Coto Block of the Zambales Ophiolite Complex, Philippines. They possibly provide us with textural...Kanazawa University, Kakuma, Ishikawa 920-1192, Japan. Email: saeko_00@yahoo.com â deceased. © 2013 The...Fig. 1 Geologic map of the Zambales Ophiolite Complex (ZOC), the Philippines (modified from Yumul, 1992) | | | Journal (article/letter/editorial) | University, Sendai, Japan; bCenter for Northeast Asian Studies, Tohoku University, Sendai, Japan; cDepartment...Ethiopia; dNuclear Regulation Authority, Tokyo, Japan ABSTRACT ARTICLE HISTORY Serpentinites (massive...contains high-magnesian metamorphic olivine (forsterite [fo] ~96 mol%) and rare relict primary mantle...Listvenite associated with serpentinites of smaller ultramafic lenses also contain relict chromian spinel having...a nearly complete metasomatic replacement of ultramafic rocks by magnesite, talc, and quartz to prevent | | | Journal (article/letter/editorial) | facies: evidence from the Happo-Oâne metaperidotites (Japan) Mohamed Zaki Khedr Ă Shoji Arai Received: 1 April...peridotite complex is situated in the northeastern part of the Hida Marginal Tectonic Zone, central Japan, characterized...Kanazawa University, Kakuma, Kanazawa 920-1192, Japan e-mail: khedrzm@yahoo.com formation of low-T, low-Ti... Forearc mantle Happo-Oâne metaperidotites Japan Introduction Upper mantle peridotites change their...peridotites. The Happo-Oâne metaperidotites, central Japan, are associated with high-P/T schists of the Renge | | | Journal (article/letter/editorial) | Island, a part of Burma-Andaman-Java subduction complex in the Bay of Bengal. Chromite mainly occurs as...as massive chromitite pods in mantle ultramafic tectonite and as thin massive chromitite bands together...together with minor disseminations in crustal ultramafic cumulate. Other than pods chromite also appears as:...Burma-Java subduction complex. Introduction Chromite is a common mineral in ultramafic rocks especially in...2004). The composition of magmatic spinel is a complex function of magma and source peridotite composition | | Miura, Makoto, Arai, Shoji, Mizukami, Tomoyuki, Shmelev, Vladimir, Ishimaru, Satoko (2018) Petrology of Chromitites in the Higashi-Akaishi Ultrahigh-Pressure (UHP) Peridotite Complex, Japan: Toward Understanding of General Features of the UHP Chromitites. Minerals, 8 (11) 525 doi:10.3390/min8110525 | Journal (article/letter/editorial) | Higashi-Akaishi Ultrahigh-Pressure (UHP) Peridotite Complex, Japan: Toward Understanding of General Features of...Kanazawa University, Kakuma, Kanazawa 920-1192, Japan; ultrasa@staff.kanazawa-u.ac.jp (S.A.); peridot@staff...America (GIA) Tokyo Godo Kaisha, Tokyo 110-0016, Japan Zavaritsky Institute of Geology and Geochemistry...Technology, Kumamoto University, Kumamoto 860-8555, Japan; s_ishimaru@kumamoto-u.ac.jp Correspondence: makomiu1214@gmail...Higashi-akaishi (HA) ultramafic complex in the Cretaceous Sanbagawa metamorphic belt, Japan, which experienced | | | Journal (article/letter/editorial) | 790-8577, Japan 7 Earth-Life Science Institute, Tokyo Institute of Technology, Tokyo 152-8550, Japan 1 Abstract...the full range of starting compositions for the forsterite-magnesiochromite system to derive a PâX phase...podiform chromitites. Keywords: Magnesiochromite, forsterite, olivine, wadsleyite, ringwoodite, knorringite...can be used as a basis for description of more complex (multicomponent or natural) systems containing...(2012). Five compositions falling between the forsterite Mg2SiO4 and magnesiochromite MgCr2O4 end-members | | Zhang, Yanfei, Wang, Chao, Jin, Zhenmin, Chen, Tao, Wu, Xiang, Liu, Wenlong, Wu, Yao (2018) High-pressure phase transitions of natural chromitite from Tibetan ophiolites. Lithos, 320. 20-27 doi:10.1016/j.lithos.2018.08.038 | Journal (article/letter/editorial) | materials; therefore, further experiments are needed in complex systems to fully investigate the phase relations...shown that magnesiochromite can coexist with forsterite at pressures up to ~12 GPa and 1600 oC temperature...When MgCr2O4:Mg2SiO4 = 8:2, magnesiochromite + forsterite transforms into mLd-phase + eskolaite + Grt in...potentially account for this inconsistency, as we used complex natural rock as the starting material rather than...chromitites will help provide constraints on the complex geological processes in major collision zones. | | Xiong, Fahui, Yang, Jingsui, Dilek, Yildirim, Wang, ChunLian, Hao, Xiaolin, Xu, Xiangzhen, Lian, Dongyang (2018) Petrology and geochemistry of the high-Cr podiform chromitites of the Köycegiz ophiolite, southwest Turkey: implications for the multi-stage evolution of the oceanic upper mantle. Mineralogy and Petrology, 112 (5) 685-704 doi:10.1007/s00710-018-0560-4 | Journal (article/letter/editorial) | Neotethys Ocean during the Late Cretaceous. The ultramafic massif of Köycegiz, which is located in the ophiolitic...the Lycian Nappes to the west and the Antalya Complex to the east) (Fig. 2). Each of these internally...margin sediments; (2) a mĂ©lange-type accretionary complex; and (3) an upper thrust sheet of ophiolites (Collins...00E Ant l ar 8 0 km Tekiro va Accretionary complex Tauride platform carbonates yd N LEGEND Cretaceous...2002). The Lycian ophiolite comprises a number of ultramafic bodies, including the Köycegiz ophiolite, whose | | Saveliev, Dmitri E., Makatov, Darkhan K., Rakhimov, Ildar R., Gataullin, Ruslan A., Shilovskikh, Vladimir V. (2022) Silicates from Lherzolites in the South-Eastern Part of the Kempirsay Massif as the Source for Giant Chromitite Deposits (the Southern Urals, Kazakhstan) Minerals, 12 (8) 1061 doi:10.3390/min12081061 | Journal (article/letter/editorial) | recrystallization to form new phases of enstatite-2, forsterite, diopside, pargasite, and spinel. Petrographic...studies, on the example of the Kraka and Nurali ultramafic rocks, we showed that new grains of Cr-spinel...similar segregations of minerals non-typical for ultramafic rocks are often found together with thin Cr-spinel...suggested two major viewpoints on the genesis of ultramafic rocks and associated chromitite, i.e., igneous...As for the former one, ultramafic rocks were considered derivatives of ultramafic melt that entered the | | | Journal (article/letter/editorial) | University, Kakuma, Kanazawa, Ishikawa 920-1192, Japan. SC R 3 Research and Development Center for Ocean...Ocean Drilling Science, JAMSTEC, Yokosuka 237-0061, Japan. *Corresponding author. Tel: +2-047-3215174, Fax:...crystallization of K- or Na-rich minerals. The Balamhindit complex, where the chromitite showed K-phlogopite 1 ACCEPTED...into: Bitan gneisses, Balamhindit and Arais mafic-ultramafic rocks (Dismembered-ophiolite), Umm Araka metavolcanics...metagabbros, and metavolcanic rocks MA (Fig. 1a). The ultramafic rocks are outcropped as elongated thrust slices | | Grieco, Giovanni, Bussolesi, Micol, Tzamos, Evangelos, Rassios, Annie Ewing, Kapsiotis, Argyrios (2018) Processes of primary and re-equilibration mineralization affecting chromitite ore geochemistry within the Vourinos ultramafic sequence, Vourinos ophiolite (West Macedonia, Greece) Ore Geology Reviews, 95. 537-551 doi:10.1016/j.oregeorev.2018.03.009 | Journal (article/letter/editorial) | chromitite ore geochemistry within the Vourinos ultramafic sequence, Vourinos Ophiolite (West Macedonia...chromitite ore geochemistry within the Vourinos ultramafic sequence, Vourinos Ophiolite (West Macedonia...chromitite ore geochemistry within the Vourinos ultramafic sequence, Vourinos Ophiolite (West Macedonia...2009). The boundary between mantle rocks and ultramafic cumulates (dunite, wehrlite and pyroxenite cumulates)...(Jackson et al., 1975). In the Krapa Hill area, ultramafic cumulates progressively grade to mafic cumulate | | Ali, Rabea A.M., Maurice, Ayman E., Pitcairn, Iain K., Ahmed, Ahmed H., Azer, Mokhles K., Boskabadi, Arman, Bakhit, Bottros R., Shahien, Mohamed G. (2020) Neoproterozoic and Cretaceous mantle oxidation states: Controls and heterogeneity through time. Lithos, 356. 105375 doi:10.1016/j.lithos.2020.105375 | Journal (article/letter/editorial) | ophiolitic ultramafic rocks and chromitite samples from the ANS were collected from ultramafic masses which...out using some natural materials (wollastonite, forsterite, pyrophanite, orthoclase, and albite), synthetic...S6). 4. Results 11 Journal Pre-proof The forsterite content of olivine in harzburgites is relatively...chromitite sample which has a distinctly higher forsterite content (Fo# = 97.17). Orthopyroxene from all...AbdelKarim et al., 2016). The Neoproterozoic ultramafic rocks and chromitite samples used in the present | | | Journal (article/letter/editorial) | Cr-spinel; olivine; amphibole; PGM; ophiolite; ultramafic rock; Kempirsai min13020263 Academic Editors:...even deeper. However, the serpentinization of ultramafic rocks is usually Minerals 2023, 13, 263. https://doi...result of multiple reactions involving mantle ultramafic rocks and percolating melts of various compositions...composition. Along with inclusions typical of ultramafic rocks (olivine, pyroxenes, serpentine, chlorite...there are quite a few that are non-typical for ultramafic rocks (amphiboles, phlogopite) and âexoticâ inclusions | | Ahmed, Ahmed H., Moghazi, Abdel Kader M., Moufti, Mohamed R., Dawood, Yehia H., Ali, Kamal A. (2016) Nature of the lithospheric mantle beneath the Arabian Shield and genesis of Al-spinel micropods: Evidence from the mantle xenoliths of Harrat Kishb, Western Saudi Arabia. Lithos, 240. 119-139 doi:10.1016/j.lithos.2015.11.016 | Journal (article/letter/editorial) | margin of the Arabian Shield. Numerous fresh ultramafic xenoliths are entrained in the basanite lava...peridotite xenoliths have high bulk-rock Mg#, high forsterite (Fo90âFo92) and NiO (0.24â0.46 wt.%) contents...petrological and geochemical characteristics of ultramafic xenoliths and their host volcanic rocks, which...al., 2012). A large number of fresh mafic and ultramafic xenoliths are recorded in the Cenozoic alkali... ACCEPTED MANUSCRIPT studies focusing on the ultramafic xenoliths from the Arabian plate interpreted | | Chen, Chen, Su, Ben-Xun, Xiao, Yan, Pang, Kwan-Nang, Robinson, Paul T., Uysal, Ibrahim, Lin, Wei, Qin, Ke-Zhang, Avcı, Erdi, Kapsiotis, Argyrios (2019) Intermediate chromitite in KızıldaÄ ophiolite (SE Turkey) formed during subduction initiation in Neo-Tethys. Ore Geology Reviews, 104. 88-100 doi:10.1016/j.oregeorev.2018.10.004 | Journal (article/letter/editorial) | consists of a core of mantle rocks overlain by ultramafic cumulates, layered and isotropic gabbros, and...are intruded by mafic (dolerite, gabbro) and ultramafic (pyroxenite) dykes that display variable degrees...deformation (Dilek and Furnes, 2009; Fig. 2b). The ultramafic cumulates consist mainly of chromite-bearing...Results 4.1. Major oxide contents of minerals Forsterite (Fo) values of olivine in the KızıldaÄ harzburgites...stratigraphy and petrogenesis of the Oman ophiolite complex. Contribution to Mineralogy and Petrology 81, 168-183 | | | Journal (article/letter/editorial) | University, Kakuma, Kanazawa, Ishikawa 920-1192, Japan. PT *Corresponding author. Tel: +2-047-3215174...Introduction The Neoproterozoic ophiolitic ultramafic complex in the Eastern Desert (ED) of Egypt is a...petrogenesis and tectonic setting of Egyptian ultramafic rocks based on primary chromian spinels that...peridotites. 2. Geological setting The ophiolitic ultramafic complex composed mainly of serpentinites and associated...Quadrangle, 2009). The boundaries D between ultramafic rocks and surrounding country rocks mainly form | | | Journal (article/letter/editorial) | Deep drilling of the Atlantis Massif oceanic core complex (Mid-Atlantic Ridge, 308N) found 22 olivine-rich...Middle^Late Jurassic radiolarian cherts; a sheeted dyke complex is lacking and the basalt lava flow layer is discontinuous...troctolites has a narrow compositional range, with forsterite contents varying from 87 to 88 mol % and NiO...olivine-rich troctolites. Clinopyroxene The forsterite contents of olivine and the Mg-number of coexisting...Mg-number of clinopyroxene inner portions vs forsterite content of olivine. Literature data for olivine | | | Book | structure Dunite Enstatite Eskolaite (Cr2O3) Forsterite Ferropericlase Garnet Harzburgite Ilmenite Knorringite...represented by massive and impregnated ores in ultramafic rocks. For this reason, ultrabasic rocks are...of oxidation of lead ores near the massifs of ultramafic rocks. Weathering accompanied by decomposition...podiform chromitites from the Luobusa ophiolite complex (South Tibet, China) (Robinson et al. 2004). Chromium...experimental studies available, as well as the complex analysis of the PâT regime in the Earthâs mantle | | | Journal (article/letter/editorial) | high-Ti) within separated massifs or a single ultramafic massif makes their 47 formation processes and...2015; Lian et al., 2017), implies a series of 55 complex processes of formation of podiform chromitites...chromitite varieties outcropping within 90 the same ultramafic massif provide an ideal window to indicate the...fault (Fig. 2a). The ophiolite consists mainly of ultramafic rocks, podiform 123 chromitites, cumulates...numerous 124 veins of gabbro and diabase. The ultramafic rocks are mostly harzburgite with minor 125 | | | Journal (article/letter/editorial) | Environmental Studies, Nagoya University, Nagoya 464-8601, Japan §Mining Department, Faculty of Engineering, University...Technology, Kwansei Gakuin University, Sanda 669-1337, Japan (Received 12 March 2017; accepted 16 February 2018)...in the mantle sequence of the Zagros ophiolite complex. Keywords: Zagros suture zone, Neo-Tethys, metasomatic...partial melting, lithosphere 1. Introduction Ultramafic rocks are dispersed in suture zones and orogenic...abundant and comprise various dismembered maficâultramafic assemblages that have suffered multiple phases | | RospabĂ©, Mathieu, Ceuleneer, Georges, Le Guluche, Vanessa, Benoit, Mathieu, Kaczmarek, Mary-Alix (2021) The Chicken and Egg Dilemma Linking Dunites and Chromitites in the MantleâCrust Transition Zone beneath Oceanic Spreading Centres: a Case Study of Chromite-hosted Silicate Inclusions in Dunites Formed at the Top of a Mantle Diapir (Oman Ophiolite) Journal of Petrology, 62 (4) doi:10.1093/petrology/egab026 | Journal (article/letter/editorial) | Research Institute for Marine Geodynamics (IMG), Japan Agency for MarineâEarth Science and Technology (JAMSTEC)...(JAMSTEC), 2-15 Natsushima, Yokosuka, Kanagawa 237-0061 Japan; 2GeÌosciences Environnement Toulouse (GET), Observatoire... Bowen, 1915; Nicolas, 1986) to describe such complex lithologies for which the academic rock names based... Olivine Olivine inclusions in chromites are forsterite characterized by Fo [100 molar Mg/(Mg ĂŸ Fetotal)]...destabilization of pargasite into the assemblage diopside ĂŸ forsterite ĂŸ nepheline ĂŸ spinel ĂŸ anorthite ĂŸ vapor, at | | Zhou, Mei-Fu, Robinson, Paul T., Su, Ben-Xun, Gao, Jian-Feng, Li, Jian-Wei, Yang, Jing-Sui, Malpas, John (2014) Compositions of chromite, associated minerals, and parental magmas of podiform chromite deposits: The role of slab contamination of asthenospheric melts in suprasubduction zone environments. Gondwana Research, 26 (1) 262-283 doi:10.1016/j.gr.2013.12.011 | Journal (article/letter/editorial) | of podiform chromite deposits are MA highly complex. ED 3.2. Platinum-group element distributions...penetrating the upper mantle would not be ED Complex, USA (Lipin, 1993). PT expected to experience...from the Takashima SC alkali basalt, Southwest Japan arc, may provide an example of such deposits formed...from MA the Takashima alkali basalt, Southwest Japan arc. Mineralium Deposita 29, 434-438. Arai, S.,...chromitites of the Tari-Misaka ultramafic complex, AC 1279-1288. CE Southwest Japan, as mantle-melt |
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