 | | Journal (article/letter/editorial) | | Late Cenozoic Metallogeny of Southwest Hokkaido, Japan Yasushi WATANABE Mineral Resource Research Group...Tsukuba Central 7, Higashi 1-1-1, Tsukuba 305-8567, Japan [y-watanabe@aist.go.jp] Received on May 29, 2001;...magmatic style and stress field of southwest Hokkaido, Japan, and compiles deposit form, type, ore and alteration...activity. The late Cenozoic tectonic regime of the Sapporo-Iwanai ore district is divided into five periods...stress. Productive vein-type deposits, such as Toyoha, Inakuraishi, Ohe and Chitose, formed in the neutral |  | | Journal (article/letter/editorial) | | Hokkaido,Japan NAOTATSU SHIKAZONO Abstract Epithermal lead-zinc vein-type depositsof the Toyoha mine, Hokkaido...Hokkaido, Japan, occur in the Green Tuff region of Miocene age. The veins are divided into two groups,...sulfide stage which is composedof sphalerite-pyrite-quartz with minor hematite,sphalerite-galena-pyrite,sphalerite-pyrite...stage which is composedof manganocalcite-pyrite-quartz and calcite-quartzsubbands from outside(earlier)...someextent, the following features are clarified for Toyoha mineralizationon the basis of detailedmineralogicaland |  | | Journal (article/letter/editorial) | | University, 6-10-1 Hakozaki, Higashi-ku, Fukuoka 812-8581, Japan [e-mail: imai@mine.kyushu-u.ac.jp] Received...deposits (Harukayama, Muineyama, Hishikari) in Japan. The F contents of the halogen-rich phlogopite range...deposit, hydrothermal ore deposit, volcanic rocks, Japan eastern Honshu). In addition, Horinouchi and Horikoshi...phlogopite (F contents > 3 wt%) occurs in hydrothermal quartz veinlets in andesite erupted from Omeshidake and...central Honshu, Japan. Horikoshi (1990) reported that the hydrothermal phlogopite in quartz veinlets in andesites |  | IMAI, Akira, MATSUEDA, Hiroharu, YAMADA, Ryoichi, MASUTA, Kenzo (1999) Polymetallic Mineralization at the Shin-Ohtoyo Deposit, Harukayama District, Hokkaido, Japan. Resource Geology, 49 (2) 75-88 doi:10.1111/j.1751-3928.1999.tb00033.x | Journal (article/letter/editorial) | | Shin-Ohtoyo Deposit, Harukayama District, Hokkaido, Japan Akira IMAI*, Hiroharu MATSUEDA**, Ryoichi YAMADA***...20 km west of Sapporo, Hokkaido, Japan. Both acid-type disseminated and adularia-quartz-type vein Au mineralizations...characteristic mineral assemblage; (1) chalcedonic quartz veinlets in silicified zone around the deposit...occurrence of friedrichite and stibiocolusite from Japan are reported. The chemical formula of the unnamed...drill cores recovered by Metal Mining Agency of Japan (MMAJ) vary from –2.7 ‰ to +0.8 ‰. Sulfur isotopic |  | Ono, Shuji, Hirai, Koji, Matsueda, Hiroharu, Kabashima, Taro (2004) Polymetallic Mineralization at the Suttsu Vein-type Deposit, Southwestern Hokkaido, Japan. Resource Geology, 54 (4) 453-464 doi:10.1111/j.1751-3928.2004.tb00221.x | Journal (article/letter/editorial) | | Suttsu Vein-type Deposit, Southwestern Hokkaido, Japan Shuji ONO, Koji HIRAI1, Hiroharu MATSUEDA* and Taro...Engineering, Hokkaido University, N13, W8, Kita-ku, Sapporo 0608628, Japan [e-mail: onoshu@eng.hokudai.ac.jp] *...University, N10, W8, Kita-ku, Sapporo 060-0810, Japan ** Metals Exploration Group, Japan Oil, Gas and Metals...Corporation, 1310 Omiya-cho, Saiwai-ku, Kawasaki 212-8554, Japan 1 Present address: Resources and Metals...Metals Co. Ltd., 2-10-1 Toranomon, Minato-ku, Tokyo 105-0001, Japan Received on March 24, 2004; accepted on |  | | 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...Nogizaka building 9-6-41 Akasaka, Minato-ku, Tokyo 107, Japan 1992 29th IGC FIELD TRIP GUIDEBOOK Volume...Volume 6 : Mineral Deposits of Japan and the Philippines Editors: Tetsuro Urabe and Masahiro Aoki The...Nogizaka building 9-6-41 Akasaka, Minato-ku, Tokyo 107, Japan Technical Editors Technical Reviewer: Editorial |  | | Journal (article/letter/editorial) | | 2000 Sulfur Isotopic Study of the Toyoha Deposit, Hokkaido, Japan −Comparison between the Earlier-Stage...the Toyoha deposit, Hokkaido, one of the largest Pb-Zn-Ag polymetallic vein-type deposits in Japan, were...the studied sulfide minerals collected from the Toyoha deposit range from +5 to +9‰, with an average of...1. Introduction The Toyoha mine is located in about 40km southwest of Sapporo City, Hokkaido (Fig. 1)...producers in Japan. It also is the most productive of the indium ores (Ohta, 1989). The Toyoha deposit is |  | | Journal (article/letter/editorial) | | magmatic-hydrothermal systems at Toyoha-Muine area in southwest Hokkaido, Japan Toru Shimizu1 and Masahiro...Aoki2 1 Geological Survey of Japan and 2Geological Museum, AIST, Tsukuba, Japan Abstract This paper presents...alteration and K–Ar age data from the Toyoha-Muine area (TMA), where the Toyoha polymetallic (Ag–Pb–Zn–Cu–In)...mineral assemblages are summarized as follows: (I) Quartz (silicified rock); (II) Pyrophyllite or dickite;...0 Ma in the southern and southeastern parts of Toyoha deposit at depth, overprinting the Middle to Late |  | | Journal (article/letter/editorial) | | the Nakakoshi Copper Deposits, Central Hokkaido, Japan Norio Tsushima*, Hiroharu Matsueda** and Shunso...tetrahedrite, Ag-minerals and Cu-Zn-Fe-In-Sn-S minerals, quartz and sericite. Chalcopyrite and pyrite contain sphalerite...similar to those of the reduced type veins of the Toyoha deposits. However there is distinct difference...values are -10.9 ‰ at the Nakakoshi and 5.2 ‰ at the Toyoha. It is suggested that the Nakakoshi deposits were...ilmenite-series granitoids under higher temperature than the Toyoha veins, which were formed by fluids liberated from |  | | Journal (article/letter/editorial) | | low-sulfidation epithermal gold deposit, Northeast Japan arc Teruhiro Suzuki | Shota Satori Graduate School...International Resource Sciences, Akita University, Akita, Japan Correspondence Yasushi Watanabe, Graduate School...Akita 010-8502, Japan. Email: y-watanabe@gipc.akita-u.ac.jp Funding information Japan Society for the...deposits in the Tohoku region of the Northeast Japan arc; however, these deposits have undergone limited...research study of the Bosawa deposit in Akita Prefecture was conducted to support future gold exploration |  | | Journal (article/letter/editorial) | | Jozankei-Zenibako District, Southwest Hokkaido, Japan Yasushi WATANABE* and Eijun OHTA** Abstract: Hydrothermal...Otarunaigawa and Asarigawa systems are related to quartz porphyry. The Ogawa system includes potassic, sericitic...subduction of the Pacific plate beneath the Northeast Japan arc. Normal, in contrast to oblique, plate subduction...formed mostly in the Pliocene and Pleistocene time (Toyoha, Teine, Koryu, etc.), and only a few deposits are...contemporaneous with the intrusion of the Late Miocene quartz porphyry (Sawai and Itaya, 1996). Watanabe (1990) |  | | Journal (article/letter/editorial) | | Possible Southeast Extension of the Toyoha Polymetallic Deposit, Japan Toru SHIMIZU, Masahiro AOKI* and...Geological Survey of Japan/AIST, Central 7, Higashi 11- 1, Tsukuba 305-8567, Japan [e-mail: t.shimizu@aist...Geological Survey of Japan/AIST, Central 7, Higashi 1-1-1, Tsukuba 305-8567, Japan ** Global Minerals Exploration...Mining Agency of Japan, Tokiwa Bldg., 1-24-14, Toranomon, Minato-ku, Tokyo 105-0001, Japan Received on December...sphalerite from a possible southeast extension of the Toyoha polymetallic deposit. Sphalerite occurs as euhedral~subhedral |  | | Journal (article/letter/editorial) | | Phreatic Craters in the Muine Volcano, Hokkaido, Japan Yasushi WATANABE Institute for Geo-Resources and...AIST, Central 7, Higashi 1-1-1, Tsukuba 305-8567, Japan [e-mail: y-watanabe@aist.go.jp] Received on November...the Pliocene Muine volcano in southwest Hokkaido, Japan, were carried out. The alunite with 17.4 permil...the Muine volcano. 1. Introduction 2. Geology The Toyoha polymetallic Pb-Zn-Ag vein deposit is located about...southwest Hokkaido, Japan (Fig. 1). Watanabe (1990) related the mineralization of the Toyoha deposit to the |  | | Journal (article/letter/editorial) | | Facultyof Science,Universityof Tokyo,Bunkyo-ku,Hongo,Tokyo113, Japan Abstract The assemblage and mode of occurrenceof...ganguemineralsvary with different deposittypes: quartz, chalcedonicquartz, adularia, calcite, smectite...zeolites,and kaolinitcin Au-Ag-richdeposits;chlorite, quartz, sericite,carbonates(calcite, rhodochrosite, siderite)...suggestthat the fco• for vein-type mineralizationin Japan is controlled by alteration mineralscommonlyoccurringin...hostrocksfor Neogenevein-typemineralizationdistrictsin Japan,it was found that many Cu-Pb-Zn-richvein-type depositsoccurin |  | | Journal (article/letter/editorial) | | Environmentsof Formation of Vein-Type Depositsin Japan NAOTATSU •HIKAZONO Abstract Electron probe microanalysis...deposits of Au-Ag type (Ohmori mine) and Pb-Zn type (Toyoha mine) in Japan reveal a remarkable contrast...weight percent, whereas the zinc content in the Toyoha deposit is less than can be detected by present...specimensfrom the epithermal Au-Ag Ohmori mine and Pb-Zn Toyoha mine. Giving specialattention to the zinc...electrum, rhodochrosite, barite, hematite, magnetite, quartz, and minor amounts of sulfidesand sulfosaltssuch |  | | Journal (article/letter/editorial) | | Hydrothermal Alteration in Toyoha Geothermal System, Southwestern Hokkaido, Japan Atsuyuki Inoue,1 Kyohei...University, Chiba, Japan, 2Graduate School of Natural Science, Chiba University, Chiba, Japan and 3Japan International...Research Center for Agricultural Science, Tsukuba, Japan Abstract In this study, we applied chemical geothermometers...various types of hydrothermally altered rocks in the Toyoha geothermal field, using core samples from six drill...to TH-7) together with wasted ore samples from Toyoha vein-type ore deposit. Based on the preliminary |  | | Journal (article/letter/editorial) | | aqueousspecies,ionic strength, activity coefficients Toyoha (Pb-Zn) mine of aqueousspecies,activitiesof components...studies. Becausethe chemicalcomposi- calcite,and quartz. Three stagesare recognized of the northwest-southeast...commonlyin these deposits. Yatani (Au-Ag-Pb-Zn) mine General Description of the Ore Deposits The locationsof...acidic composition. The depositsstudied include Toyoha (Pb-Zn), Yatani (Au-Ag-Pb-Zn), Seigoshi (AuAg)...CONTENT Seigoshi(Au-Ag) mine OF ACANTHITE 525 Ikuno (Cu-Pb-Zn-du-dg-Sn-I4•) mine The orebodiesare hostedby |  | | Journal (article/letter/editorial) | | Exploratory Drills TH-4 and TH-6 near the Toyoha Deposit, Hokkaido, Japan Miyuki Nitta and Atsuyuki Inoue Department...Graduate School of Science, Chiba University, Chiba, Japan Abstract We studied calcite and rhodochrosite from...cores (TH-4 and TH-6) near the Toyoha deposit, southwestern Hokkaido, Japan, from the aspect of stable isotope...of which is basically equivalent to that in the Toyoha veins. The measured d18OSMOW and d13CPDB values...fluids pertaining to the formation of veins in the Toyoha deposit. Keywords: calcite, carbon and oxygen isotope |  | | Journal (article/letter/editorial) | | Telluride Mineralization in Southwestern Hokkaido, Japan Euis T. YUNINGSIH*, Hiroharu MATSUEDA** and Ildrem...University Museum, Hokkaido University, Sapporo 060–0810, Japan Tellurium–bearing gold, silver, and base...southwestern Hokkaido, Japan. The telluride deposits in this district consist of quartz–filled fracture systems...alteration minerals are very fine to fine–grained quartz, chalcedony, anatase, zeolite, sericite, barite...with time. Microthermometry of fluid inclusions in quartz and barite indicate that the mineralization formed |  | | Journal (article/letter/editorial) | | INDIUM-BEARING SPHALERITE FROM THE TOYOHA POLYMETALLIC DEPOSIT, JAPAN TORU SHIMIZU† AND YUICHI MORISHITA...MORISHITA Geological Survey of Japan, AIST, 1-1-1 Higashi, Tsukuba 305-8567, Japan Abstract Textural, chemical...characteristics of In-bearing sphalerite from the Toyoha Zn-PbAg-Cu-Sn-In vein-type deposit are investigated...In-bearing ores (350°−400°C) previously reported at Toyoha. Textural and chemical characteristics indicate...source. Introduction Toyoha is located at the northern end of the northeast Japan arc. It is the largest |  | | Journal (article/letter/editorial) | | AIST, Central 7, Higashi 1-1-1, Tsukuba 305-8567, Japan [e-mail: s-ishihara@aist.go.jp] * Department of...739-8526, Japan ** Institute for Geo-resources and Environment, Geological Survey of Japan, AIST Central...Central 7, Higashi 1-1-1, Tsukuba 305-8567, Japan Received on April 9, 2006; accepted on July 29, 2006 Abstract:...vary from a few ppm (e.g., Kosaka mine) to more than 300 ppm (Toyoha mine). The amount of indium in all the...vein types. The largest one is Toyoha mine (4,700 tons In) and the Ashio mine (ca. 1,200 tons In) was found |  | | Journal (article/letter/editorial) | | in Japan NAOTATSU SHIKAZONO GeologicalInstitute,Facultyof Science,Universityof Tokyo,Bunkyo-ku,Hongo...Hongo,Tokyo113, Japan Abstract The assemblageelectrum-sphalerite-pyrite-argentite is commonin epithermalAu-Ag...comparedwith the filling temperaturesof fluid inclusionsin quartz, which was consideredto have grown nearly simultaneously...Thesemineralsare generally scatteredasisolatedgrainsin quartz and alsooccur in the direct contact with each other...some base metal-richdeposits(e.g., Ohe, Ohmidani,Toyoha), sulfide minerals (chalcopyrite,sphalerite,galena) |  | | Book | | 5 Kuroko, Hokuroku basin, Northeastern Honshu, Japan ..................... 58 3.2.6 Laochang, Changning-Menglian...Hyogo Prefecture, Honshu, Southwest Japan .................... 79 3.4.3 Fukoku, Kyoto Prefecture, Honshu...Southwest Japan ....................... 82 3.4.4 lkuno, Hyogo Prefecture, Honshu, Southwest Japan .........District, Gifu Prefecture, Honshu, Southwest Japan ..... 83 3.4.6 Omodani, Fukui Prefecture, Honshu, Southwest...Southwest Japan ..................... 84 3.4.7 West Shropshire Orefield, England ..................... |  | | Journal (article/letter/editorial) | | in the Toyoha–Muine area, southwest Hokkaido, Japan TORU S HIMIZU* Geological Survey of Japan, AIST,... 1-1-1 Higashi, Tsukuba 305-8567, Japan (Received November 7, 2011; Accepted February 5, 2012) Sulfur...systems in the altered volcanic host rocks of the Toyoha–Muine area are determined. Miocene and Pliocene–Pleistocene...hydrothermal systems, ore minerals, alteration, Toyoha–Muine ess and the origin of sulfur (Kiyosu, 1974;...presents existing mineralogical and INTRODUCTION The Toyoha–Muine area (hereafter referred to as TMA) is a |  | | Journal (article/letter/editorial) | | Economic Geology, Tohoku University, Sendal 980, Japan Abstract. To determine the bulk chemical compositions...specimens from various types of ore deposits in Japan were used for modal and electron microprobe analyses...specimens from the Maruyama deposit in the Tsumo mine contain 1.2-1.4 at% Zn, which are within the solubility...dusts ofchalcopyrite as observed in ores from the Toyoha and Furutobe mines (see Fig. 2 d), it was impossible...Table 1. In the case of specimens from the Tsumo mine of a socalled skarn-type deposit, ores consist mainly |
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