 | | Journal (article/letter/editorial) | | Nlrsun Ann Kanazawa University,Kakuma,Kanazawa920-11,Japan Departmentof EarthSciences, Facultyof Science, ABSTRACT...ABSTRACT The Kawashimo alkali basalt of the southwest Japan arc has peridotite xenoliths with a wide lithological...peridotite xenoliths from Kawashimo, southwest Japan, which support the interaction theory for the origin...basalt In the Kawashimo area, Shimane Prefecture, southwestern Japan, small amounts of alkali basalt occur...< I mm across. Xenoliths The basalt has many ultramafic xenoliths, up to 5 cm across,and megacrysts(Iizumi |  | | Journal (article/letter/editorial) | | contact-metamorphosed dunite-harzburgite complex at Yanomine, eastern Chugoku, Japan Yoshinori INOUE* , *** and Katsuo...Science, Okayama University, Okayama 700 − 8530, Japan Department of Earth Sciences, Faculty of Science...Science, Okayama University, Okayama 700 − 8530, Japan *** Present address: Nikko Exploration and Development...Toranomon 2 − 7 − 10, Minato − ku, Tokyo 105 − 0001, Japan ** Phlogopite was found in small amounts in the...metamorphic aureole of the dunite − harzburgite complex at Yanomine. Phlogopite occurs intimately associated |  | | 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 |  | | Journal (article/letter/editorial) | | d peridotite-sediment system from Nagasawa, SW Japan: implications for mobility of elements in a hydrothermal...contactmetamorphosed peridotite-sediment system from Nagasawa, SW Japan: implications for mobility of elements in a hydrothermal...d peridotite-sediment system from Nagasawa, SW Japan: implications for mobility of elements in a hydrothermal...University, 1060 Nishikawazu, Matsue, Shimane 690-8504, Japan. 2. Department of Earth Sciences, Kanazawa University...University, Kakuma, Kanazawa, Ishikawa 920-1192, Japan. E-mail: ultrasa@staff.kanazawa-u.ac.jp 3. Present |  | Watanabe, Makoto, Nishido, Hirotsugu, Hoshino, Kenichi, Hayasaka, Yasutaka, Imoto, Nobuhiro (1998) Metallogenic epochs in the Inner Zone of southwest Japan. Ore Geology Reviews, 12 (4) 267-288 doi:10.1016/s0169-1368(98)00002-x | Journal (article/letter/editorial) | | Metallogenic epochs in the Inner Zone of southwest Japan Makoto Watanabe a a,) , Hirotsugu Nishido b, Kenichi...Science, Hiroshima UniÕersity, Higashi-Hiroshima 739, Japan b Research Institute of Natural Sciences, Okayama...717-06, Japan c Department of Earth Sciences, Kyoto UniÕersity of Education, Kyoto 612, Japan Received...metallogenic epochs in the Inner Zone of southwestern Japan are classified by considering mainly radiometric...Cambrian Epoch: Characterized by podiform-type chromite deposits hosted in ophiolite complexes; these |  | | Journal (article/letter/editorial) | | Kanazawa University, Kakuma. Kanazawa 920-11, Japan Received 22 May 1997; accepted Schiano et al. [I]...which formed a dunite (chromitite)-troctolite complex [2,4], without any supply from subducting slab... Petrology of the gabbro-troctoliteperidotite complex from Hess Deep, equatorial Pacitic: implications...[61 S. Arai, H. Yurimoto, Tari-Misaka ultramafic complex, Southwestern Japan, as mantle-melt interaction...Arai/Earth 91 T.N. Irvine. Origin and Planeta- of chromite layers in the Muskox intrusion and other intrusions: |  | | Journal (article/letter/editorial) | | metamorphosed serpentinites from three Japanese ultramafic complexes, and some crystals contain anthophyllite...lamellae. The Mg/(Mg + Fe) ratios of the Hayachine, Tari-Misaka, and Takase protoanthophyllites are 0.90, 0.92...occur in metamorphosed ultramafic rocks, in reaction zones between ultramafic and country rocks, in low-Ca...(Robinson et al. 1982; Deer et al. 1997). When ultramafic rocks are incorporated into orogenic belts by...of Mg-Fe amphiboles from three serpentinites in Japan that are inconsistent with anthophyllite, and evidence |  | | Journal (article/letter/editorial) | | Sciences, Kanazawa University, Kanazawa 920-1192, Japan PT ED telephone: 81-76-264-6522 ABSTRACT CE...presented for hydrothermal modification/formation chromite/chromitite in the mantle, which is a classical...create chromite-oversaturated magma. The incompatible-element-rich magma trapped by the chromite mainly...Moderately depleted harzburgites, which contain chromite with a moderate Cr# (0.4-0.6) and a small amount...hydrothermal fluids can dissolve and precipitate chromite, and hydrothermal chromitites (chromitites precipitated |  | 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...magnesiochromite (MgCr2O4), spinel (MgAl2O4), and chromite (FeCr2O4) components (Fig. 1; Table 1). The Cr/(Cr+Al) |  | | Journal (article/letter/editorial) | | Sciences, Kanazawa University, Kanazawa 920-1192, Japan NU Our original paper (Arai and Miura, 2015) discussed...supplied less modified, olivine-chromite saturated, melt to form chromite-oversaturated melts which precipitate...rock of moderately depleted harzburgites in which chromite has moderate Cr# (Cr/(Cr + Al) of, around 0.5...Macquarie Island ophiolite represents an oceanic core complex (Tucholke and Lin, 1994) that formed at a slow...is highly depleted, containing high-Cr# (~0.7) chromite (Ishizuka, CE 1985). The MORB-like lavas, are |  | ZHOU, Mei-Fu, MALPAS, John, ROBINSON, Paul T., SUN, Min, LI, Jian-Wei (2001) Crystallization of Podiform Chromitites from Silicate Magmas and the Formation of Nodular Textures. Resource Geology, 51 (1) 1-6 doi:10.1111/j.1751-3928.2001.tb00076.x | Journal (article/letter/editorial) | | Abstract: Podiform chromite deposits consist of numerous individual accumulations of chromite in the mantle...Simple mixing of two distinct magmas, invoked for chromite deposits in layered intrusions, is inadequate...podiform chromite deposits. More likely, melt/rock interaction triggers the precipitation of chromite by addition...behave like snowballs. These droplets concentrate chromite to form an outer shell and, while the magma is...However, podiform chromite deposits consist of numerous individual accumulations of chromite for which simple |  | | Journal (article/letter/editorial) | | Short Communication Textural Evidence for the Chromite-Oversaturated Character of the Melt Involved in...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...This texture was formed by the reaction between chromite-oversaturated melt and its dunite inclusions....is now confirmed by this discovery. Keywords: chromite-oversaturated melt, dunite, Philippines, podiform |  | | Journal (article/letter/editorial) | | chesterite in contact-metamorphosed serpentinites from Japan Hiromi Konishi,1,2,3,* Peter R. Buseck,2,4 Huifang...metamorphosed serpentinites from two Japanese ultramafic complexes. The lattice constants of the proto...occur in two contact metamorphic serpentinites in Japan. The discovery of proto-varieties of wide-chain...The Hayachine ultramafic complex (4 × 2 km) of the Tohoku district, northeastern Japan, experienced contact...1986b). The Tari-Misaka ultramafic (10 × 6 km) complex of the Chugoku district, western Japan, experienced |  | | Journal (article/letter/editorial) | | Sciences, Kanazawa University, Kanazawa 920-1192, Japan * Corresponding author NU e-mail: ultrasa@staff...moderately refractory harzburgite that contains chromite with an intermediate Cr# (Cr/(Cr + Al)) of 0.4–0...that some podiform chromitites comprise mainly chromite PT (chromian spinel) with a high Cr# (Cr/(Cr...presence of minute inclusions of primary silicates in chromite (e.g., Lorand and Ceuleneer, 1989), 4 ACCEPTED... SC RI involvement of slab-derived fluids in chromite formation (e.g., Schiano et al., 1997; Rollinson |  | | Journal (article/letter/editorial) | | ppm), Ni poor (441−875 ppm) and are similar to chromite in boninites from around the world and to the... V, Mn, Co, Ni, Zn, and Ga) in chromite calculated from the chromite and their host lava (boninite and...chromitites have supplied more than half of the world’s chromite ore production despite the fact that most of these...high Al/Fe ratio (refractory ore) compared with chromite from most chromitite deposits in large layered... It has been suggested that the metallurgical chromite (i.e., Cr-rich) ore formed from second-stage, |  | | Journal (article/letter/editorial) | | ppm), Ni poor (441−875 ppm) and are similar to chromite in boninites from around the world and to the... V, Mn, Co, Ni, Zn, and Ga) in chromite calculated from the chromite and their host lava (boninite and...chromitites have supplied more than half of the world’s chromite ore production despite the fact that most of these...high Al/Fe ratio (refractory ore) compared with chromite from most chromitite deposits in large layered... It has been suggested that the metallurgical chromite (i.e., Cr-rich) ore formed from second-stage, |  | | Journal (article/letter/editorial) | | for Geological Mapping of Esfandagheh Ophiolite Complex, Southern Iran Mohsen Pournamdari,1,2 Mazlan Hashim1...(serpentinite dunite) for chromite exploration targets. Keywords: ASTER, chromite exploration, feature level...level fusion, Landsat TM, ophiolite complex. 1. Introduction Podiform chromitites occur primarily in...dunite in the ophiolitic complexes is helpful for chromite exploration. Recent development of multi-spectral...techniques to ASTER data for geological mapping of ultramafic complexes in the Mordor Pound, Australia. Gad |  | | Journal (article/letter/editorial) | | 第 10 号 591−597 ページ，2004 年 10 月 Jour. Geol. Soc. Japan, Vol. 110, No. 10, p. 591−597, October 2004 組成...in the Omi serpentinite melange（Hida Mountains, Japan）deduced from zoned Cr-spinel Abstract 辻森 樹＊ Tatsuki...94305-2115, USA． tatsukix@pangea.Stanford.EDU Ultramafic rocks of the Omi serpentinite melange are extensively...系及び，その西方の境川水系に属する上路川支流の CThe Geological Society of Japan 2004 かなやま あげ ろ 591 しなだに 谷， 592 辻森 樹 2004―10...との反応が重 Fig.3. Compositional plots of analysed chromite. （A） Compositions of Cr-spinels on the Cr−Al−Fe3＋ternary |  | ARAI, Shoji, PRICHARD, Hazel M., MATSUMOTO, Ichiro, FISHER, Peter C. (1999) Platinum-Group Minerals in Podiform Chromitite from the Kamuikotan Zone, Hokkaido, Northern Japan. Resource Geology, 49 (1) 39-47 doi:10.1111/j.1751-3928.1999.tb00030.x | Journal (article/letter/editorial) | | Chromitite from the Kamuikotan Zone, Hokkaido, Northern Japan Shoji ARAI*, Hazel M. PRICHARD**, Ichiro MATSUMOTO***...in the Sarugawa peridotite complex in the Kamuikotan zone, Hokkaido, Japan. This is the first report on...(= platinum-group minerals) from chromitites in Japan. The Ru-Os-Ir alloys most typically form polyhedra...zone than in those in the Sangun zone of Southwest Japan, consistent with the more refractory nature (Cr#...dunite from the Inazumi-yama complex in the Sangun zone, Southwest Japan. It is well known that PGM are |  | | Journal (article/letter/editorial) | | ELSEVIER Lithos37(1996) 0 1-13 Melting of a chromite-bearing harzburgite and generation of boninitic...113, Japan Received 7 June 1994 Abstract Compositions of melts and coexisting olivine, chromite and...are mixtures of olivine, enstatite, diopside and chromite separated from peridotites and a chromitite. The...coexisting with olivine, Ca-poor pyroxene and chromite are relatively silica- and MgO-rich ( SiOZ, 53-57;...The Cr,O, contents in the melts saturated with chromite range from 0.34-1.82 wt.%. The experimental results |  | | Journal (article/letter/editorial) | | chromitite from the Iwanai-dake peridotite complex, Hokkaido, Japan: A reaction between peridotite and highly...Kanazawa University, Kakuma, Kanazawa 920-1192, Japan ABSTRACT 2+ 3+ Spinel [(Mg, Fe )(Cr, Al, Fe )2O4]...chromitite section from the Iwanai-dake complex, Hokkaido, Japan, which mainly consists of highly depleted...GEOLOGY AND PETROLOGY OF THE IWANAI-DAKE PERIDOTITE COMPLEX 3+ Spinel, (Mg, Fe )(Cr, Al, Fe )2O4, is especially...especially useful as a petrogenetic indicator for ultramafic and mafic rocks because its composition is sensitive |  | | Journal (article/letter/editorial) | | XENOLITHS FROM THE TAKASHIMA ALKALI BASALT, SOUTHWEST JAPAN ARC MAKOTO MIURA§ AND SHOJI ARAI Department of...Sciences, Kanazawa University, Kanazawa 920-1192, Japan ABSTRACT Chromitites in ophiolites are frequently...Chromitite xenoliths from Takashima, southwest Japan, derived from the current sub-arc mantle, are here...chromitite xenoliths from Takashima from the southwest Japan arc show various textures, including nodular, anti-nodular...alkali basalt, Oman ophiolite. INTRODUCTION Ultramafic xenoliths provide us with direct information |  | | Journal (article/letter/editorial) | | PAPER Petrogenetic implications of ophiolitic chromite from Rutland Island, Andaman—a boninitic parentage...of Burma-Andaman-Java subduction complex in the Bay of Bengal. Chromite mainly occurs as massive chromitite...chromitite pods in mantle ultramafic tectonite and as thin massive chromitite bands together with minor disseminations...disseminations in crustal ultramafic cumulate. Other than pods chromite also appears as: (a) anhedral...bands contain high Cr (Cr#—73 to 80). Restitic chromite grains in mantle ultramafics are high-Mg (Mg#—58) |  | | Journal (article/letter/editorial) | | Shoji Arai Kanazawa University, Kanazawa 920-1192, Japan; ultrasa@staff.kanazawa-u.ac.jp ...representing fossil magma conduits, in the upper mantle. Chromite grains contain peculiar polymineralic inclusions...may form in a similar fashion. The origin of the chromite-hosted inclusions in chromitites has been controversial...controversial but left unclear. The chromite-hosted inclusions also characterize the products of the peridotite–melt...between the mantle peridotite and magma. Some of the chromite grains in the stratiform chromitite originally |  | 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 |
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