 | | Journal (article/letter/editorial) | | of the Kuroko Deposits in Japan and Their Implications T. URABE Tokyo, Japan The most remarkable difference...difference in mineralogy of the Kuroko deposits in Japan is shown in their mineral assemblages of wall-rock...geology and mineralogy of the Kuroko deposits in Japan until now (WaTANABE 1973). In the last decade, volcanic...O 9"" JAPAN e 0 SEA HONSHU lB. 200KM Fig. 1. Distribution of the Kuroko deposits in Japan. • - -...- - - -- Unclassified (no available data). The Japan Sea side of the dashed lines and the northeastern |  | | Journal (article/letter/editorial) | | J. Japan. Assoc. Min. Petr. Econ. Geol. 68, 161-169,1973 ARTIFICIAL HYDROTHERMAL TUFFS IN AND SODIUM...reaction Miocene age. volcanism and/or in Japan 100•Ž in and and montmorillonite in (1972)...interstitial which and discuss alteration but Odate formed Ca++, an heulan Na2CO3. zone surrounding...present of from Recently, Coombs analcime to quartz have from Barrer 1959). Iwasaki at with...This is 1.0-2.0mm in modal distinct, solu Quartz-rare. and tion. Loc. ture): Tsubaki, This |  | | Journal (article/letter/editorial) | | from the Ezuri Kuroko Deposit, Hokuroku District, Japan Kosei KOMURO, Naoaki AOKI* and Yoshimichi KAJIWARA...Tsukuba, 1-1-1 Ten’nodai, Tsukuba, Ibaraki 305-8571, Japan [e-mail: komuro@arsia.geo.tsukuba.ac.jp] * Deceased...black ore in the Ezuri Kuroko deposit, Hokuroku, Japan. By treating samples with conventional hydrofluoric...preserved within microcrystalline to cryptocrystalline quartz, and exhibit no obvious features related to compaction...(“Tetsusekiei”) of the Kuroko deposit in the Kosaka mine (Ishikawa, 1964), similar fossil records have been |  | | Journal (article/letter/editorial) | | from the Ezuri Kuroko Deposit, Hokuroku District, Japan Kosei KOMURO and Yoshimichi KAJIWARA Institute...of Tsukuba, 1-1-1 Ten'nodai, Tsukuba 305-8571, Japan [e-mail: komuro@arsia.geo.tsukuba.ac.jp] Received...Ezuri Kuroko deposit in the Hokuroku district of Japan. X-ray microdiffractometry of this mineral gives...association with the igneous activity of the Ohtaki quartz diorite of the later Onnagawa stage. It is likely...transformation or recrystallization of biogenic opal into α-quartz. Keywords: colusite, germanium, siliceous ore, |  | | Journal (article/letter/editorial) | | Suruey of lapan, Kqwada-cho 8, Shinjuku-ku, Tokyo, Japan Icnno SuNlcawa Institute ol Mineralogy, Petolo...negative striations collected from four localities in Japan. It is concluded that positive striations are associated...present study are those obtained at the Shakanai mine, Akita Prefecture. Crystals with negative striations...striations from a few other localities in Japan were also studied for reference. 0bservations Crystals with Negatioe...ShakanaiMine Shakanai mine, Akita Prefecture, is one of the famous Kuroko-type deposits in Japan, bearing |  | | Journal (article/letter/editorial) | | Ore” 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...electrum and native silver)(Sato et al., 1981) and Shakanai deposits (Urashima and Sato, 1968). In addition...deposits is 1. Introduction It has been noticed among mine geologists that peculiar brownish-to-greyish colored |  | | Journal (article/letter/editorial) | | the so-calledGreen Tuff basins of Tertiary age in Japan. They are the youngest,least modifiedexamplesknown...personalcommunicathe broad contextof metallogenicepochsin Japan. tions. We alsodiscuss the genesisof the felsicrocks...Takeuchi (1970). Grade of crude ore (%) Name of mine Kosaka l Hanaoka t Year of Size of ore de- ...in 1972 (per month) Crude ore -- 45,000 tons mine• 25 million tons Acid leached Cu = 70 tons 1.2...of 35 million tons = 50,000 tons Fukazawa t Shakanai • Kanayamazawa 1969 Manzaku 1969 190 X 190 |  | | Journal (article/letter/editorial) | | KurokoDeposits of theKosakaMine,Northeast Honshu, Japan Productsof SubmarineHot Springson Miocene Sea Floor...SATO Abstract The Kosaka mine is a productiveCu-Pb-Zn-Au-Ag mine in Japan and is locatedat the easternmargin...geologicevidence. Introduction productivemining districtsin Japan (Fig. 1). The Tn• Kuroko depositsare strataboundmassive...east of the mine (seeIsomi, 1968). They cropout about 1.5 km to the north of the mine and have been...probablyderivedfrom the Towadavolcano abmlt 10 km northeast of the mine area. , Geolopicstructure ; ,• Legend ['•"• |  | | Journal (article/letter/editorial) | | Hokuroku District, Northeast Japan HARUHISA MOROZUMI,†,* 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) | | 1971 study of Shakanai No.l Prefecture, the Kuroko-ores deposits, Japan of Akita YOSHIMICHI KAJIWARA...Mineralogical of Education, Institute, Tokyo, Japan (ReceivedSeptember 13, 1970; in revisedform December...the Kuroko-oresfrom the No.I depositsof the Shakanai mine reveal that the S34Svalue of sulfide minera...+3.0°/ in black-ores;+4.6 to -6.0%° in hematite-quartz layers. S34Svalues of barite in the black-ores...in hydrothermal processes. In the present Shakanai mine, equilibria are physico-chemical paper |  | | Journal (article/letter/editorial) | | isotopes Shimane in the Iwami Kuroko Japan Prefecture, MASAHIRO YAMAMOTO Department of Earth Science...Faculty of Science, Okayama University, Okayama 700, Japan (Received November 28, 1973; in revised form December...sulfide pairs from the Kuroko deposits in Northeast Japan (KAJIWARA and DATE, 1972). Other sulfide pairs including...ores of the Shakanai No. 1 deposits and several other Kuroko deposits in Northeast Japan, computed isotope...temperature scales (KAJIWARA and KROUSE,1970). In the Shakanai No.1 deposits KAJIWARA (1971) observed a decreasing |  | | Journal (article/letter/editorial) | | ions of Fluid Inclusionsin the Kuroko Deposits,Japan HIROSHI OHMOTO AND ROB•.RT O. RYe. Abstract Initial...the Kuroko depositsin the Hokuroku district of Japan fall within a narrow range: $D =--26 to --18 per...ore-bearingformation(mostly wall rhyolitesconsistprimarily of quartz, pyrite, and OH-water in sericite), (3) water in...mineral and the rock samples ferruginousquartz beds (quartz + hematite) at the were collectedfrom two deposits...metallic ores depositof the Dowa Mining Co. and the Shakanai are often underlain by extensivegypsum-anhydrite |  | | Journal (article/letter/editorial) | | type solution mineralization responsible in Japan YOSHIMICHI KAJIWARA Geological and Mineralogical...of Science, Tokyo Kyoiku University, Tokyo 112, Japan (Received August 12, 1972; in revised form February...geochemical data for the Kuroko type deposits in. Japan, an attempt has been made to calculate the concentrations...formations, particular ly in northeastern parts of Japan. In general, the deposits show a unique stratified...that is, (1) disseminated ore or siliceous ore (quartz-pyrite-chalcopyrite ore), (2) pyrite ore and "yellow |  | | 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 240˚C |  | | Journal (article/letter/editorial) | | University of Tokyo, Komaba, Meguro-ku, Tokyo 153, Japan. (Received December 18, 1973; in revised form January...from various origins (hot springs, banks in the Japan Sea and Kuroko-type or vein-type ore mines) vary...Springs The Kawarage mine is at present not being mined. Minerals in this mine were mostly sulfur with...89 (d) Barite nodules dredged from banks in the Japan Sea Samples were col lected by HOSHINO et al. from...of barite nodules from the Shinguri Bank in the Japan Sea off the North-east Honshu Weight % Upper |  | | Journal (article/letter/editorial) | | ZONES, MAKURAZAKI VOLCANIC AREA, KAGOSHIMA PREFECTURE, JAPAN MOTOHARU KAWANO ' AND KATSUTOSHI TOMITA 2...Kagoshima University, 1-21-24 Korimoto, Kagoshima 890, Japan 2 Institute of Earth Sciences, Faculty of Science...Kagoshima University 1-21-35, Korimoto, Kagoshima 890, Japan Abstract- Two distinct zonal sequences of clay...in the Makurazaki volcanic area, Kagoshima Prefecture, Japan. The clay mineral sequences from the inner...in the Makurazaki volcanic area, Kagoshima Prefecture, Japan. These deposits were formed by hydrothermal |  | | Report (chapter) | | Sato G e o l o g i c a l S u r v e y o f Japan, T o k y o , Japan ( l a t e l y , Department of Geology...553.43/.44(52) Synopsis The Kuroko deposits of Japan are predominantly massive, stratiform sulphide ores...pyrite, chalcopyrite, sphalerite, galena, barite and quartz. They are zoned vertically. Gypsum and/or anhydrita...of underlying magma. The Kuroko ore deposits of Japan are considered to be a prototype of heavy metal...constituent. The Green Tuff rocks are distributed on the Japan Sea side of the Japanese islands from Hokkaido to |  | | Journal (article/letter/editorial) | | Fluids for the NeogeneVeinsand KurokoDepositsof Japan KEIKO HATTORI AND HITOSHI SAKAI Abstract The...The $D values of inclusionfluids from quartz and calcite of the Au-Ag vein deposits range from --48 to...waters. The •sO/•60 ratios of the ore fluids of quartz, the filling temperatures of the fluid inclusions...inclusions,and the isotopic fractionation factor between quartz and water show only slight shifts from these values... --50 and about --2, respectively,for the Iwami mine, southwestHonshu. These isotopic results, the salinity | | | Journal (article/letter/editorial) | | J. Japan. Assoc. Min. Petr. Econ. Geol. 78, 350-360, 1983 Miharaite in bornite-rich Ulsan mine, copper...Engineering, University, Ohkubo 3-4-1, Tokyo 160, Japan Miharaite stringer of has vein, Korea by The...(1:1) miharaite and at 31.3, occurring as mine, The 540nm: 33.0 Vickers hardness long it...ore rich in bornite from the Mihara mine, Okayama Prefecture, Japan and was named miharaite by Sugaki et...this mineral from a quartz-vein deposit of the Imo-oka mine, Okayama Prefecture. Subsequently, the third |  | | Journal (article/letter/editorial) | | 974-991 Isotopic Geochemistry of the ThermalWatersof Japan and its Bearingon the KurokoOre Solutions HITOSHI...Tertiary formationsunderlying mostvolcanicareasof Japan. The ore solutions responsiblefor Kuroko ore depositswere...isotopicfeaturesof certain 974 THE THERMAL WATERS OF JAPAN 975 types of ore solutions(Hall and Friedman 1963;...physicochemical conditions. Major thermal water systemsof Japan are in Tertiary to Recentvolcanicregions,especiallyin...Paleogeneplutonicand volcanicrocks. The thermalwatersof Japan,therefore,havea wide variationin chemistryrangingfrom |  | | Book | | IN SEDIMENTOLOGY 26 CLAYS AND CLAY MINERALS OF JAPAN FURTHER TITLES IN THIS SERIES VOLUMES 1 , 2 ...IN SEDIMENTOLOGY 26 CLAYS AND CLAY MINERALS OF JAPAN Edited by TOSHIQ SUDQ Emeritus Professor, Tokyo...Geoscience, University of Tsukuba, Ibaragi Pref. 300-31, Japan 1978 KODANSHA LTD. Tokyo ELSEVIER SCIENTIF PUBLISHING...under t i t l e : Clays and c l a y minerals of Japan. (Developments i n sedimentology ; 26) (Kodansha...Bibliography: p. Includes index. 1. Clay--Japan. 2. Clay minerals--Japan. I. SudO, Toshio, 191111. Shimcda, |  | | Journal (article/letter/editorial) | | SHINZAN HYDROTHERMAL ALTERATION AREA, NORTHEAST JAPAN INouE ATSUYUKI Geological Institute, College of...Arts and Sciences, Chiba University, Chiba 260, Japan MINORU UTADA Department of Geology, Faculty of...of Science, University of Tokyo, Tokyo 113, Japan Abstract-A complete conversion series for mica/smectites...ore deposits at the Shinzan area, Akita Prefecture, Northeast Japan, The minerals are an alteration product...also abundant in hydrothermal alteration areas. In Japan, occurrences have been reported mainly from the |  | | Journal (article/letter/editorial) | | of ore deposition,drawn by Mr. G. R. Green from mine maps and his own mapping; see Brathwaite (1974)...zones have been comparedto the I Drillhole [7• Quartz-chlorite alteration '-'l•-•'] >1• pyrite subsu...full extent of the stockwork zone is not known. quartz,sericite,chlorite,and pyrite. In the Hokuroku basinthe...the Rosebery-typedeposits,thoughat the Rosebery mine trace-element anomalies in disseminated pyrite in...the Upper Motoyama is beingconfused orebody(Yokota mine), after Hirabayashi(1974, Fig. 3). case,but it is |  | | Journal (article/letter/editorial) | | Kosaka District, Japan E1 HORIKOSHI Institute of Mining, K y u s h u University, Japan In the Miocene...Miocene Kosaka formation of NE-Japan, submarine volcanic sedimentary deposits of the Kuroko-type occur. This...also found in Quaternary terrestrial volcanoes of Japan. Submarin-vulkanisch-sediment~ire Lagerstfitten...ebenfalls in quart~iren terrestrischen Vulkanen in Japan gefunden, wobei bier keine MineraUagerstfitten des...n t g r o u p of Cu Z n Pb-mineral deposits in Japan is called the K u r o k o - t y p e of deposits |  | | Journal (article/letter/editorial) | | University, Yokohama, Japan Abstract Major minerals (sulfates, sulfides, quartz) are distributed in different...Kuroko deposits (black and yellow ores), while quartz is abundant in the lower parts (siliceous ore)...ore). The different distribution of barite and quartz in the Kuroko deposits can not be accounted for by...kinetics model was used to calculate the amounts of quartz, barite, and anhydrite precipitated from a hydrothermal...that barite precipitates more efficiently than quartz from discharging fluids with relatively higher |
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