 | | Journal (article/letter/editorial) | | Siliceous Black Ore from the Ezuri Kuroko Deposit, Hokuroku District, Japan Kosei KOMURO, Naoaki AOKI*...Tsukuba, 1-1-1 Tenânodai, Tsukuba, Ibaraki 305-8571, Japan [e-mail: komuro@arsia.geo.tsukuba.ac.jp] * Deceased...the siliceous black ore in the Ezuri Kuroko deposit, Hokuroku, Japan. By treating samples with conventional...preserved within microcrystalline to cryptocrystalline quartz, and exhibit no obvious features related to compaction...benthic foraminifera, siliceous ore, black ore, Ezuri, Hokuroku, Kuroko (Guber and Ohmoto, 1978; Kitazato |  | | Journal (article/letter/editorial) | | Siliceous Black Ore from the Ezuri Kuroko Deposit, Hokuroku District, Japan Kosei KOMURO and Yoshimichi...of Tsukuba, 1-1-1 Ten'nodai, Tsukuba 305-8571, Japan [e-mail: komuro@arsia.geo.tsukuba.ac.jp] Received...siliceous black ore from the Ezuri Kuroko deposit in the Hokuroku district of Japan. X-ray microdiffractometry...association with the igneous activity of the Ohtaki quartz diorite of the later Onnagawa stage. It is likely...into α-quartz. Keywords: colusite, germanium, siliceous ore, black ore, siliceous ooze, Ezuri, Hokuroku |  | | Journal (article/letter/editorial) | | Oreâ from the Fukasawa Kuroko Deposits, Northeast Japan: Its Characteristics and Formation Process Osamu...Fukasawa kuroko-type deposits, northern Honshu, Japan. As this type of ores also occur in the marginal...uppermost part of several other kuroko deposits in Japan, the formation of brown ore appears to be repeated...deposits (>1000 g/t Ag) (Narita et al., 1977), Ezuri deposits (1000 to 1500 g/t Ag)(Sato and Sasaki,...deposits is 1. Introduction It has been noticed among mine geologists that peculiar brownish-to-greyish colored |  | | Journal (article/letter/editorial) | | Hiroshima University, Higashi Hiroshima 739-8526, Japan Received on August 19, 2004; accepted on August...annual production figures in thousands of tons are: Japan 800â1000; South Korea 350â500; USA 800â850; India...coal-bearing depressions, Type IV: occurrence in quartz-veins in hydrothermal systems, Type V: weathering...(Sikhote-Alin); 14~17 â Japan: 14 â Aiti, 15 â Mitsuishi, Hiroshima, 16 â Nagasaki, 17 â Ezuri; 18 â South Korea;...tuffaceoussedimentary packets Pyrophyllite, pyrophylliteâquartz, sericiteâpyrophyllite Dacite-rhyolite, rhyolite |  | | Journal (article/letter/editorial) | | Science, Tohoku University, Aoba Sendal 980-77, Japan Abstract Back-scattered electron imaging with a...involving a reaction of natural sphalerite (Shinyemi mine, Korea) with Cu-bearing hydrothermal solutions at...the Toyoha, the Furutobe and the Ezuri mines, Japan. The Toyoha mine, situated in western Hokkaido, is...this study. The Furutobe and Ezuri deposits are located in Akita Prefecture and belong to the Kuroko-type;...Kuroko-type; the former is the mine where chalcopyrite disease was first discussed by Barton (1978). For the |  | | Journal (article/letter/editorial) | | Hokuroku District, Northeast Japan HARUHISA MOROZUMI,â ,* NOBUAKI ISHIKAWA, Japan Oil, Gas and Metals National...1310 Omiya, Saiwai, Kawasaki, Japan 212-8554 AND YOHEI ISHIKAWA Akita Prefectural Resources Technology...Kazuno-gun, Akita, Japan 017-0202 Abstract In the inner zone of the northeastern Japan arc, kuroko-type...Introduction THE METAL MINING AGENCY of Japan (MMAJ), now called the Japan Oil, Gas and Metals National Corporation...situated in the inner zone of the northeastern Japan arc (Ministry of Economy, Trade and Industry, 2002) |  | | Journal (article/letter/editorial) | | the Doyashiki Kuroko Deposits, Hokuroku Basin, Japan Satoshi KITAZONO and Hirotomo UENO Department of...Science, Kagoshima University, Kagoshima 890-0065, Japan [e-mail: gsekita@moon.sci.kagoshima-u.ac.jp] Received...the Doyashiki Kuroko deposits, Hokuroku basin, Japan for the first time. Main ore minerals are sphalerite...bornite, marcasite and hematite are also observed. Quartz, barite and gypsum are common gangue minerals....temperatures and salinities of fluid inclusions in quartz, sphalerite and barite range from 190 to 240ËC |  | | Journal (article/letter/editorial) | | lavas, pyroclastics, quartz-feldspar porphyries, and cherty tuffs. A âwhite micaâquartzâpyriteâ mineral assemblage...greenschist-grade regional metamorphism on âclay-quartz-pyriteâ hydrothermal alteration haloes. Massive...are usually underlain by deformed Cu-pyrite and quartz-pyrite stockworks. Most of the sulfide ore bodies...alteration halos characterized by hydrothermal quartz and phyllosilicate minerals, which may extend into...fine-grained rocks. Phenocrysts and porphyroclasts of quartz and feldspars are usually arranged along foliation |  | | Journal (article/letter/editorial) | | Potential for Base and Precious To Metal Deposits in Japan 2020) Antonio ARRIBAS and Toshio MIZUTA Faculty...Sciences, Akita University, Akita, Japan Abstract There are no known porphyry copper deposits in Japan. Attempts...latter option. In this article, we focus on Akita Prefecture and the surrounding areas and consider the...Honshu and that it serves as a proxy for Japan in general. Akita is rich in mineralization styles and deposits...active vein mine, closed in 1978. Kuroko deposits, the main source of metal production in Akita in the 20th |  | Barrie, C. D., Boyce, A. J., Boyle, A. P., Williams, P. J., Blake, K., Ogawara, T., Akai, J., Prior, D. J. (2009) Growth controls in colloform pyrite. American Mineralogist, 94 (4) 415-429 doi:10.2138/am.2009.3053 | Journal (article/letter/editorial) | | University, Ikarashi-2 8050, Niigata 950-2181, Japan 1 2 aBstraCt Primary colloform textures preserved...two ore deposits, Greens Creek in Alaska and Ezuri in Japan, have been systematically analyzed for grain...bacteriogenic ÎŽ34S between â40 and â32â°, whereas the Ezuri colloform has a positive ÎŽ34S of ~+5â°, typical of...detailed analyses reveal that in both Greens Creek and Ezuri, there is no systematic correlation between sulfur...Greens Creek deposit in Alaska and the Ezuri deposit in Japan. geologiC setting The Greens Creek deposit |  | | Journal (article/letter/editorial) | | sedimentary area BRUCE R. DOE2 Bunkyo-ku, Tokyo 113, Japan' and Branch of Isotope Geology, U.S. Geological... kuroko mineralization are within The rock Japan. Certain igneous the rocks, felsic therefore...significant for kuroko than link data. the Japan. . The data for from mafic to The kuroko immediate...1979) indicate that the kuroko ores from northeast Japan have essentially uniform isotopic composition. ...PROCEDURE for galenas from the Uwamuki deposit, Kosaka mine, for Miocene igneous rocks associated with the Uwamuki |  | | Journal (article/letter/editorial) | | Mineralization in the Hokuroku District, Northeast Japan Ryoichi YAMADA and Takeyoshi YOSHIDA Institute of...Science, Tohoku University, Aoba, Sendai 980-8578, Japan [e-mail: yamadary@ganko.tohoku.ac.jp] Received on...the most important Kuroko containing province in Japan. There are two cycles of the bimodal volcanic sequence...the post-ore dacitic rocks are characterized by quartz-plagioclasephyric aphanitic lava and dome. These...economically the most important Kuroko province in Japan such that a great deal of geological and petrological |  | Glasby, G.P., Iizasa, K., Hannington, M., Kubota, H., Notsu, K. (2008) Mineralogy and composition of Kuroko deposits from northeastern Honshu and their possible modern analogues from the Izu-Ogasawara (Bonin) Arc south of Japan: Implications for mode of formation. Ore Geology Reviews, 34 (4) 547-560 doi:10.1016/j.oregeorev.2008.09.005 | Journal (article/letter/editorial) | | analogues from the Izu-Ogasawara (Bonin) Arc south of Japan: Implications for mode of formation G.P. Glasby...Germany Geological Survey of Japan, AIST, 1-1-3 Higashi, Tsukuba, Ibaraki 305, Japan c Department of Earth Sciences...of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-003, Japan b a r t i c l e i n f o Article history: Received... 1991. A new model for Kuroko-type deposits of Japan. Episodes 14, 246â251]. © 2008 Elsevier B.V. All...Introduction The Kuroko deposits of NE Honshu, Japan, are a key type deposit for the study of volcanogenic |  | | Journal (article/letter/editorial) | | euhedralismand promotingtheir aggregation;(5) depositionof quartz, white mica,chlorite,andcalcite;and (6) formationof...KING ,KLALA KEYSTONE 4OĂž45' MOUNTAIN BIOTITE QUARTZ ALBITE 40o30 , DIORITE GRANITE âą PALEOZOIC...nonsulfideminerals,in decreasing abundance,are quartz, white mica, calcite,chlorite, and iron oxides...+ tennantite + quartz + white mica; (4) recrystallizationand remobilization;(5) quartz + white mica +..."primitive" pyrite after Barton (1978). asbiotite quartz diorite. Framboids,a largeproportionpreservedasironoxide |  | | Journal (article/letter/editorial) | | albite KAl3Si3O10(OH)2 + 6SiO2 + 3Na+, sericite quartz (2) and 2KAl3Si3O10(OH)2 + 3H4SiO4 + 9Fe2+ +...least altered andesite, cl = chlorite ± pyrite ± quartz, clco = chlorite > dolomite, se = strong sericite-chlorite...± pyrite, SEZ = weak sericite ± chlorite, si = quartzâchlorite ± sericite (modified from Gemmell and...sericite altered rhyolitic pumice breccias and quartz-feldspar porphyry Chlorite-sericite alteration...The sericite zone has an inner core of intense quartz-sericite-pyrite alteration and an outer halo of |  | | Journal (article/letter/editorial) | | Technology, Kasumigaseki I-3-1, Chiyoda-ku, Tokyo 100, Japan Abstract--In 1970s-1980s, the following two basic...magnetite-series of Quaternary volcanic belts in Japan, Miocene magmatic belts are characterized by paired...geologists (Wallace et al. 1978) investigated the Urad mine which was mined for molybdenite~luartz veins in...conclusion that these veins are associated with Urad quartz-feldspar porphyry, but disseminated stockwork deposits...4% Cu and 0.4 ppm Au were found associated with quartz diorite porphyry (J. Hedenquist, pers. commun. |  | | Book (volume) | | Field Trip Guide Book Vol. 6 MINERAL DEPOSITS OF JAPAN AND THE PHILIPPINES r QE 304 . A14 1992 v.6 The...Field Trip Guide Book Vol. 6 MINERAL DEPOSITS OF JAPAN AND THE PHILIPPINES The Society of Resource Geology...Tokyo 107, Japan 1992 29th IGC FIELD TRIP GUIDEBOOK Volume 6 : Mineral Deposits of Japan and the Philippines...building 9-6-41 Akasaka, Minato-ku, Tokyo 107, Japan Technical Editors Technical Reviewer: Editorial...Harufumi Noro Geological Survey of Japan 1-1-3 Higashi, Tsukuba 305, Japan Copyright Holder: The Society |  | | Book | | been carried out. Epithermal vein-type deposits in Japan have also been well-studied. More than 1,000 papers...on Kuroko and epithermal vein-type deposits in Japan will be summarized in Chapter 1. The descriptions...study epithermal vein-type and Kuroko deposits in Japan. I learned from them an importance of the integration...fluid inclusion studies of vein-type deposits in Japan were especially valid and useful to writing this...On the origin of Kuroko of the Kosaka mine. J. Geol. Soc. Japan, 26, 107-132 (in Japanese). Ohmoto, H |  | Marumo, Katsumi, Urabe, Tetsuro, Goto, Akiko, Takano, Yoshinori, Nakaseama, Miwako (2008) Mineralogy and Isotope Geochemistry of Active Submarine Hydrothermal Field at Suiyo Seamount, Izu-Bonin Arc, West Pacific Ocean. Resource Geology, 58 (3) 220-248 doi:10.1111/j.1751-3928.2008.00059.x | Journal (article/letter/editorial) | | Ibaraki, Japan, 2Department of Earth and Planetary Science, University of Tokyo, Tokyo, Japan and 3Institute...Resources and Environment, AIST, Tsukuba, Ibaraki, Japan Abstract This report presents mineralogical, geochemical...Seamount in the IzuâBonin Island Arc, south of Japan. This deposit is regarded as the first example of...Central 7, 1-1-1 Higashi, Tsukuba, Ibaraki 3058567, Japan. Email: k.marumo@aist.go.jp *Present address: Nagoya...Research, Furo-cho, Chikusaku, Nagoya, Japan. â Present address: Japan Agency for Marine-Earth Science and |  | | Journal (article/letter/editorial) | | particularlyin the Mount Read Volcanics in the immediate mine area. In thispaper,we presentresultsfrom part of...Manysuchstudiesignoredthe possible geochemical the immediate mine area and from the Devonian effectsof alterationthat...formsthe basisfor lithologicalmapGeology ping at the mine. WhereasprimarygeochemicalafGeologicand structuralsetting...bulk of the volcanicrocksin the Que white mica,quartz,and albite. Anatase(?)appearsto River area. They...volcanicrocks.Shardlikeformsare rarelypreserved; quartz, carbonate,white mica, chlorite, prehnite, more |  | | Journal (article/letter/editorial) | | Takara Volcanogenic Massive Sulfide Deposit, Central Japan Daigoro YAKUSHI and Mamoru ENJOJI Department of...Sciences, Waseda University, Shinjuku, Tokyo 169-8050, Japan [e-mail: dyakushi@akane.waseda.jp] Received on July...Mountain, the South Fossa Magna region, central Japan. The tectonic setting of the Misaka Mountain is...Mountain, the South Fossa Magna region, central Japan, about 90 km west of Tokyo (Fig. 1). Conventionally...typically occur in Miocene formation in northeast Japan (Sato, 1974). However, the geology of the Misaka |  | Velasco, F., SĂĄnchez-España, J., Boyce, A. J., Fallick, A. E., SĂĄez, R., AlmodĂłvar, G. R. (1998) A new sulphur isotopic study of some Iberian Pyrite Belt deposits: evidence of a textural control on sulphur isotope composition. Mineralium Deposita, 34 (1) 4-18 doi:10.1007/s001260050182 | Journal (article/letter/editorial) | | monotonous mineralogy, with quartz and albite phenocrysts supported by a quartz-feldspar-sericite groundmass...annealing and some deformation twins. ConcepcioĂn mine. Specimen etched with HNO3. C Replacement texture...grey) and galena (light grey, gn), AznalcoĂllar mine. D Coarse-grained euhedral pyrite crystals containing...grey) and gangue minerals (black), AznalcoĂllar mine. E Deformed pyrite metablasts separated by gangue...abundant (e.g. Castillo de las Guardas, ConcepcioĂn). Quartz, carbonate, muscovite and chlorite are the most |  | | Journal (article/letter/editorial) | | Mudstones in the Green Tuff Region, Northeastern Japan Kosei KOMURO and Yoshimichi KAJIWARA Institute...Tsukuba, 1-1-1 Tenânodai, Tsukuba, Ibaraki 305-8571, Japan [e-mail: komuro@arsia.geo.tsukuba.ac.jp] Received...area of the central Green Tuff region, northeast Japan, was examined by chemical analysis. According to...developed in the Green Tuff region of Northeast Japan. Of these deposits, the middle Miocene Onnagawa...the Taiheizan area, located about 17 km east of Akita city (Fig. 1). The geology of the area consists |  | | Journal (article/letter/editorial) | | Successive zoning of Al and H in hydrothermal vein quartzâ Naoya Miyoshi, Yoshiaki Yamaguchi, and Kuniaki...inclusions from the Niigata oil and gas fields, JapanâSusumu Okubo Influence of upwelling Zechstein sulphate...modelling of sulphidic waste rock dumps at the Aitik mine site, SwedenâClaire M. Linklater, Daniel J. Sinclair...Mortensen 325 BULLETIN OF THE GEOLOGICAL SURVEY OF JAPAN Vol. 55, No. 3/4, 2004 Oxygen isotopic constraints...in the Kitakami and Abukuma terrains, northeast JapanâShunso Ishihara and Yukihiro Matsuhisa 57 BULLETIN |  | | Journal (article/letter/editorial) | | along with carbonates, white mica, chlorite, and quartz). Alteration assemblages are easy to identify in...schist, quartzite, pyroxenite, quartz-magnetite-apatite, tourmalinite, quartz breccia, hornblende schist...albite, quartz mineral association) and quartz magnetite apatite rocks (goethite, hematite, quartz, fluorapatite...pyrrhotite mineral association). The Beldih Apatite mine is the type area where syenite-carbonatite emplaced...2013; Arogyaswami and Dutta, 1948). Auriferous quartz veins were reported as emplacement within highly |
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