Updated on 2024/07/28

Information

 

写真a

 
IMAI AKIRA
 
Organization
Faculty of Engineering Department of Earth Resources Engineering Professor
Faculty of Engineering Research Center for Environmental Engineering(Joint Appointment)
School of Engineering (Joint Appointment)
Graduate School of Engineering Department of Earth Resources Engineering(Joint Appointment)
Graduate School of Engineering Department of Cooperative Program for Resources Engineering(Joint Appointment)
Title
Professor
Profile
Specialty in economic geology, resource geology, with special interest in magmatic hydrothermal system where porphyry copper and epithermal gold deposits are formed associated with magmatism in plate boundaries. Methods in research in economnic geology, ore deposit geology are tought, and graduates are expected to be exploration geologists in global activity. A member of advisory committee of Metal Mining Agency of Japan, and a member of Japanese supporting university in Asian University Network (AUN/SEED-Net) suponsored by Japanese government.
External link

Degree

  • D.Sc. (Hokkaido University, Japan)

Research History

  • 1990年4月〜2003年3月:東京大学助手                                                    2010年7月〜2017年9月:秋田大学教授

Research Interests・Research Keywords

  • Research theme:Magmatic hydrothermal system associated with magmatism at plate boundaries with focus on metallogenesis of porphyry copper and eppithermal gold deposits

    Keyword:magmatic hydrothermal system, porphyry copper deposits, epithermal gold deposits, metallogenesis

    Research period: 1987.4 - 2033.3

Awards

  • Best Article Award 2020

    2021.6   Society of Resource Geology  

  • Honorary Member

    2020.12   Geological Society of the Philippines  

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    フィリピン地質学会創立75周年の祝賀行事の一環として、同会として初めての外国人の名誉会員に選出された。フィリピンの火山に関する国際的な研究者(例えばピナツボ火山噴火に関する多くの国際的な研究論文がある)、地震や断層に関する構造地質学の国際的研究者、珊瑚礁などの環境科学に関する国際的研究者など、世界的に知られた国際的に著名な多くの研究者がいる中で、初めての外国人名誉会員として選出された。

  • Best Article Award 2018

    2019.6   Society of Resource Geology  

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    Award for Best Article appreared in Resource Geology in 2018.

  • Best Article Award 2017

    2018.6   Society of Resource Geology  

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    Award for Best Article appreared in Resource Geology in 2017.

  • Best Article Award 2005

    2006.6   Society of Resource Geology  

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    Award for Best Article appreared in Resource Geology in 2005.

  • 研究奨励賞

    1999.6   資源地質学会  

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Papers

  • Overprinting porphyry-type veinlets on the intrusive rocks and phreatomagmatic breccias in the Southwest prospect, southwestern Sto. Tomas II (Philex), Baguio District, Philippines Reviewed International journal

    Cirineo, A. V. L., Imai, A., Takahashi, R., Baluda, R. P., Oliveros, N., Maglambayan, V. B., Luis, R. R., Faustino, M. L. M. and Almadin, J.

    Resource Geology   71 ( 1 )   1 - 40   2021.1

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: DOI: 10.1111/rge12242

  • Characteristics of porphyry Cu mineralization at Waisoi (Namosi district), Viti Levu, Fiji Invited Reviewed International journal

    Imai, Akira, Ohbuchi Yukiko, Tanaka Takayuki, Morit Seita, Yasunaga Kentaro

    Resource Goelogy   2007.12

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    Language:English  

  • Concentration of gold(I) thiosullfate complex ions on the surface of alumina gel and their change in chemical state: Preliminary experiment in the elucidation of the formation mechanism of epithermal gold deposits Invited Reviewed International journal

    Yonezu Kotaro, Yokoyama Takushi, Okaue Oyoshihiro, Imai Akira, Watanabe Koichiro

    Resource Geology   2007.12

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    Language:English  

  • Concentration of Gold(I) Thiosulfate Complex Ions on the Surface of Alumina Gel and their Change in Chemical State : Preliminary Experiment in the Elucidation of the Formation Mechanism of Epithermal Gold Deposits Reviewed International journal

    Yonezu Kotaro, Yokoyama Takushi, Okaue Yoshihiro, IMAI Akira, WATANABE Koichiro

    Resource geology   57 ( 4 )   400 - 408   2007.12

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    Language:English   Publishing type:Research paper (international conference proceedings)  

    Concentration of gold(I) Thiosulfate complex ions on the surface of alumina gel and their change in chemical state Preliminary experiment in the elucidation of the formation mechanism of epithermal gold deposits
    In order to elucidate the formation mechanism of low-sulfidation epithermal gold deposit, the adsorption of [Au(S2 O3)2]3- (a model compound for gold(I) complex ion) on alumina gel (a model compound for the aluminum-bearing minerals) and change in chemical state of [Au(S2 O3)2]3- after adsorption on the surface of alumina gel were investigated as a basic model experiment. In the pH range from 4 to 6, the amount of [Au(S2 O3)2]3- adsorbed on alumina gel decreased with increasing pH and decreased drastically between pH 6 and 7, and then approached zero above pH 8 at 30°C. At 60°C, the amount of gold adsorbed above pH 7 was enhanced compared with that at 30°C. This adsorption tendency indicates that [Au(S2O3)2]3- is mainly adsorbed by electrostatic interaction between negative charges of [Au(S2O3)2]3- and positive charges of alumina gel because of its isoelectric point around pH 9. The chemical state of gold after adsorption of [Au(S2 O3)2]3- on alumina gel was examined using X-ray absorption near edge structure (XANES). The result showed that [Au(S2O3)2]3- was spontaneously reduced to elemental gold even in the absence of specific reducing agents after adsorption on alumina gel. This reduction reaction might occur by two steps: (i) disproportionation of the adsorbed [Au(S2O3)2]3- at the surface of alumina gel, and (ii) spontaneous reduction of the resulting gold(III) complex ions on the surface of alumina gel. The experimental results suggest that aluminum plays an important role in the concentration of gold(I) complex ions and subsequent reduction of gold during the formation of low-sulfidation epithermal gold deposits.

    DOI: 10.1111/j.1751-3928.2007.00035.x

  • Concentration of gold(I) thiosullfate complex ions on the surface of alumina gel and their change in chemical state: Preliminary experiment in the elucidation of the formation mechanism of epithermal gold deposits Invited Reviewed International journal

    Yonezu Kotaro, Yokoyama Takushi, Okaue Oyoshihiro, Imai Akira, Watanabe Koichiro

    Resource Geology   2007.12

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  • Characteristics of the Cibaliung gold deposit: A Miocene low sulfidation type epithermal gold deposit at the western Java, Indonesia Reviewed International journal

    Harijoko, A., Ohbuchi, Y., Motomura, Y., Imai, A. and Watanabe, K.

    Resource Geology   2007.6

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  • Porphyry-type mineralization at Selogiri area, Wonogiri regency, central Java, Indonesia Reviewed International journal

    Imai, A., Shinomiya, J., Soe, M. T., Setijadji, L. D., Watanabe, K. and Warmada, I W.

    Resource Geology   2007.6

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  • The occurrences of ore minerals and fluid inclusion study on the Kingking porphyry copper-gold deposit, eastern Mindanao, Philippines Reviewed International journal

    Suerte, L. O., Nishihara, S., Imai, A., Watabnabe, K., Yumul, G. P., Jr. and Maglambayan, V. B.

    Resource Geology   2007.6

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  • Origin of ore-forming fluids responsible for gold mineralization of the Pongkor Au-Ag deposit, West Java, Indonesia: Evidences from mineralogic, fluid inclusion microthermometry and stable isotope study of the Ciurug-Cikoret vein Reviewed International journal

    Syafrizal, Imai, A. and Watanabe, K.

    Resource Geology   2007.6

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  • Implication of sulfur isotopic variation to 2000 eruptions of Miyake-jima volcano, Izu arc Reviewed International journal

    Imai, A. Geshi, N., Shimano, T. and Nakada, S.

    Island Arc   2007.3

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    Language:English  

  • Cenozoic island arc magmatism in Java Island (Sunda Arc, Indonesia): Clues on relationships between geodynamics of volcanic centers and ore mineralization Invited Reviewed International journal

    Setijadji, L. D., Kajino, S., Imai, A. and Watanabe, K.

    Resource Geol.   2006.1

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    Language:English   Publishing type:Research paper (scientific journal)  

  • Discovery of the oldest oxic granitoids in the Kaapvaal Craton and its impolication for the redox evolution of early Earth Invited Reviewed International journal

    Ishihara, S., Ohmoto, H., Anhaeusser, C. L., Imai, A., and. Robb, L. J.

    Geol. Soc. Amer. Memoir   2006.1

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  • Sulfur isotopic study on Hg and Sb deposits in Japan Reviewed International journal

    Imai, A., Shikazono, N., Shimizu, M. and Shimazaki, H.

    Resource Geol.   2006.1

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    Language:Japanese  

  • Using sulfur isotope to determine the sources of ver-million in ancient burial mounds in Japan Reviewed International journal

    MINAMI T.

    Geoarcheology   20 ( 1 )   79 - 84   2005.1

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    Using sulfur isotope to determine the sources of vermillion in ancient burial mounds in Japan
    This study represents an attempt to determine the sources of vermillion found in ancient Japanese burial mounds of the 1st-6th centuries A.D., by comparing their ratios of sulfur isotopes with those of cinnabar ore samples collected in Japan and China. Cinnabar ore samples were taken from three mines in central Japan (Niu in Mie, Yamato in Nara, and Sui in Tokushima prefectures), and from Wanshan in China, where mining activity has been recorded back to the 6th century A.D. and earlier. When the ratios of 34S and 32S were compared with the Canyon Diablo meteorite standard, a high δ34S value of + 22.6 ± 3.60‰ was found for the Wanshan mine, as opposed to low values ranging from -7.3 ± 1.9 to -2.1 ± 1.6‰ for the Japanese mines. The ratios of sulfur isotopes in vermillion collected from ancient Japanese burial mounds also divided into two groups. High ratios (+11.1 to +22.8‰) were found in 1st- and 2nd- century burials in the western regions of northern Kyushu and San'in, suggesting that local, powerful chiefs obtained vermillion through relations with China. Lower ratios (-8.4 to -2.0‰) were found in burials of the 2nd through 6th centuries in central Japan, where the ancient Yamato dynasty emerged as the first unified polity around the end of the 2nd century A.D. We, therefore, conclude that the Yamato dynasty exploited local sources of vermillion, rather than depending solely on China. The present study demonstrates the feasibility of determining sources of vermillion using sulfur isotope ratios, and the relevance of such findings for archaeological research. © 2005 Wiley Periodicals, Inc.

    DOI: 10.1002/gea.20035

  • A study on the formation of smectite in silica scale formed from geothermal water: The effect of magnesium Invited Reviewed International journal

    Aramaki, Y., Yokoyama, T., Okaue, Y., Imai, A. and Watanabe, K.

    Resource Geol.   2005.1

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  • 40Ar/39Ar法による浅熱水性菱刈金鉱床の鉱化作用の地質年代学的な制約 Invited Reviewed International journal

    実松 健造, Duncan Robert, 今井 亮

    55 ( 3 )   249 - 266   2005.1

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1111/j.1751-3928.2005.tb00246.x

  • Primary ore mineral assemblage and fluid inclusion study of the Batu Hijau porphyry Cu-Au deposit, Sumbawa, Indonesia Invited Reviewed International journal

    Imai, A. and Ohno, S.

    Resource Geol.   2005.1

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  • Mineralization at the Ciurug vein, Pongkor gold-silver deposit, Indonesia Invited Reviewed International journal

    Syafrizal, Imai, A., Watanabe, K. and Motomura, Y.

    Resource Geol.   2005.1

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    Language:English  

  • Evolution of hydrothermal system at the Dizon porphyry Cu-Au deposit, Zambales, Philippines Reviewed International journal

    Imai, A.

    Resource Geol.   2005.1

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  • フィジー諸島共和国ナモシ地域ワイソイ鉱床の銅探鉱とその成果 Invited Reviewed

    田中隆之・森田誠也・高畑裕之・安永健太郎・今井亮・石川信明

    資源地質   2004.5

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    Language:Japanese  

  • 中国貴州省と湖南省辰砂鉱石のイオウ同位体比測定 Reviewed

    南武志, 今井亮, 豊遥秋, 冨田克敏, 比佐陽一郎, 岡山真智子, 楊主明, 今津節生

    考古学と自然科学(日本文化財科学会誌)   2004.1

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    Language:Japanese  

  • Variation of Cl and SO3 contents of microphenocrystic apatite in intermediate to silicic igneous rocks of Cenozoic Japanese Island Arcs: Implications for porphyry Cu metallogenesis in the Western Pacific Island Arcs Invited Reviewed International journal

    Imai, A.

    Resource Geol.,   2004.1

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  • Occurrence of halogen-rich phlogopite in Late Cenozoic volcanic rocks in the Japanese arcs Reviewed International journal

    Imai, A.

    Resource Geol   2004.1

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  • Metallogenesis of porphyry Cu-Au deposits of the western Luzon arc, Philippines: K-Ar ages, SO3 contents of microphenocrystic apatite and significance of intrusive rocks. Reviewed International journal

    Imai, A.

    Resource Geology   2002.6

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    Metallogenesis of porphyry Cu-Au deposits of the western Luzon arc, Philippines: K-Ar ages, SO3 contents of microphenocrystic apatite and significance of intrusive rocks.

  • Mineral paragenesis, fluid inclusions and sulfur isotope systematics of the Lepanto Far Southeast porphyry Cu-Au deposit, Mankayan, Benguet, Philippines. Reviewed International journal

    Imai, A.

    Resource Geology   2000.9

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    Mineral paragenesis, fluid inclusions and sulfur isotope systematics of the Lepanto Far Southeast porphyry Cu-Au deposit, Mankayan, Benguet, Philippines.

  • Genesis of the Mamut porphyry Cu deposit, Sabah, East Malaysia. Reviewed International journal

    Imai, A.

    Resource Geology   2000.3

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    Genesis of the Mamut porphyry Cu deposit, Sabah, East Malaysia.

  • Spinifex texture of native sulfur: A cooling product of sulfur flow eruptions at Shiretoko-Iwozan volcano, Hokkaido, Japan Reviewed International journal

    Imai, A. and Geshi, N.

    Resource Geology   1999.6

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    Language:Japanese   Publishing type:Research paper (scientific journal)  

    Spinifex texture of native sulfur: A cooling product of sulfur flow eruptions at Shiretoko-Iwozan volcano, Hokkaido, Japan

  • Polymetallic mineralization at the Shin-Ohtoyo deposit, Harukayama district, Hokkaido, Japan. Reviewed International journal

    Imai, A., Matsueda, H., Yamada, R. and Masuta, K.

    Resource Geology   1999.6

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    Polymetallic mineralization at the Shin-Ohtoyo deposit, Harukayama district, Hokkaido, Japan.

  • A Kuroko-type polymetallic sulfide deposit in a submarine silicic caldera. Reviewed International journal

    Iizasa, K., Fiske, R. S., Ishizuka, O., Yuasa, M., Hashimoto, J., Ishibashi, J., Naka, J., Horii, Y., Fujiwara, Y., Imai, A. and Koyama, S.

    Science   1999.2

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    A Kuroko-type polymetallic sulfide deposit in a submarine silicic caldera.

  • Geology, alteration, and formation environment of the disseminated gold-silver telluride Bulawan deposit, Negros Occidental, Philippines. Reviewed International journal

    Maglambayan, V. B., Ishiyama,D., Mizuta, T., Imai, A. and Ishikawa, Y.

    Resource Geology   1998.6

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    Geology, alteration, and formation environment of the disseminated gold-silver telluride Bulawan deposit, Negros Occidental, Philippines.

  • "Brown Ore" from the Fukasawa kuroko deposits, northeast Japan: Its characteristics and formation process. Reviewed International journal

    Ishizuka, O. and Imai, A.

    Resource Geology   1998.6

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    "Brown Ore" from the Fukasawa kuroko deposits, northeast Japan: Its characteristics and formation process.

  • Highly oxidized and sulfur-rich magma of Mount Pinatubo: Implication for metallogenesis of porphyry copper mineralization in the western Luzon arc. Invited Reviewed International journal

    Imai, A., Listanco, E. L. and Fujii, T.

    Newhall, C. G. and Punongbayan, R. S., eds., Fire and Mud: Eruptions and Lahars of Mount Pinatubo, Philippines   1996.12

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  • Tectonic implication of the hydrated garnet peridotites near Mt. Kinabalu, Sabah, East Malaysia Invited Reviewed International journal

    Imai, A. and Ozawa, K.

    Jour. Southeast Asian Earth Sci.   1991.12

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    Tectonic implication of the hydrated garnet peridotites near Mt. Kinabalu, Sabah, East Malaysia

  • Textural-compositional evolution of pyrite and metal remobilization during low-grade metamorphism of metapelite: Contribution to gold mineralization in the Luk Ulo Complex, Central Java, Indonesia

    Renaldi Suhendra, Ryohei Takahashi, Andrea Agangi, Akira Imai, Hinako Sato, Nugroho Imam Setiawan

    Ore Geology Reviews   166   2024.3

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    DOI: 10.1016/j.oregeorev.2024.105966

  • Geochemical study on the deposition of silica scale at Olkaria well OW-35: A key to understanding the formation mechanisms of silica scale at the Olkaria Geothermal Field, Kenya

    Edwin Wanyonyi, Kotaro Yonezu, Akira Imai, Takushi Yokoyama, Kizito Opondo, Kenneth Koech

    Geothermics   117   2024.2

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    DOI: 10.1016/j.geothermics.2023.102871

  • Role of boiling for the formation of vertical metal zoning and bonanza zone in low-sulfidation epithermal gold‑silver deposits: A geochemical modeling approach

    257   2024.2

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    Boiling and mixing are thought to be the most important processes for mineralization in the low-sulfidation epithermal gold‑silver deposits. Some low-sulfidation epithermal gold‑silver deposits show vertical zoning of metals including gold, silver, copper, lead, and zinc, but effect of boiling and mixing for the vertical zoning of metals through mineralization has been scarcely debated. Therefore, we applied geochemical modeling for an open-isenthalpic boiling system, with a hydrothermal fluid with different initial temperatures, carbon dioxide contents, salinities, and total sulfur contents to numerically evaluate the effect of boiling phenomenon for the vertical zoning in low-sulfidation epithermal gold‑silver deposits. Geochemical modeling of boiling phenomenon suggests that boiling is effective for depositing gold, silver, copper, lead, and zinc and that it could form a bonanza zone enriched in gold and silver in the shallow zone above the lead and zinc-rich zone. Temperature, carbon dioxide content, salinity, and hydrogen sulfide content affect the deposited amount of metals, vertical extent, depth of mineralization, and gold/silver ratio of the ore zone, although other factors such as permeability, gangue mineralogy, duration of mineralization, kinetics of mineral precipitation, change in porosity, thermal conductivity, and fractures of host rocks could affect mineralization as well. Our modeling of boiling phenomenon demonstrates similar characteristics with natural low-sulfidation epithermal gold‑silver deposits, suggesting that boiling is an important mechanism to cause vertical metal zoning in the low-sulfidation epithermal gold‑silver deposits, even though mixing could also be important to precipitate metals in some deposits.

    DOI: 10.1016/j.gexplo.2023.107378

  • Geology, mineralization and magma evolution of the Zuun Mod Mo-Cu deposit in Southwest Mongolia

    Gankhuyag Altankhuyag, Enkhjargal Boldbaatar, Bolorchimeg N. Tunnell, Jargalan Sereenen, Marek Locmelis, Xiaofeng Li, Akira Imai

    Journal of Asian Earth Sciences   257   2023.11

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    DOI: 10.1016/j.jseaes.2023.105857

  • Lateral variations in the Hosen 8-2 vein in the Hishikari deposit, Japan: Implications for high Au-grade zone

    Jonathan Macuroy, Ryohei Takahashi, Akira Hara, Yoshinori Okaue, Akira Imai, Pearlyn Manalo, Hinako Sato, Andrea Agangi

    Resource Geology   73 ( 1 )   2023.7

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    DOI: 10.1111/rge.12318

  • Nature and conditions of gold mineralization at the Tau deposit, Mupane mine, Tati Greenstone Belt, Botswana: Evidence from fluid inclusion and arsenopyrite geothermometer

    Onameditse Lulu Seaba, Akira Imai, Kotaro Yonezu, Manuel Nopeia, Kemmonye Baliki

    Resource Geology   73 ( 1 )   2023.7

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    Language:Others   Publishing type:Research paper (scientific journal)  

    DOI: 10.1111/rge.12316

  • Geology and geochemistry of gold mineralization at the Namicupo prospect, Mozambique Belt, northeastern Mozambique

    Journal of Geochemical Exploration   249   2023.6

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    DOI: 10.1016/j.gexplo.2023.107220

  • Mineralogical and sulfur isotopic characteristics of Archean greenstone belt-hosted gold mineralization at the Tau deposit of the Mupane gold mine, Botswana

    Onameditse Lulu Seaba, Akira Imai, Kotaro Yonezu, Kemmonye Baliki

    Resource Geology   73 ( 1 )   2023.4

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    DOI: 10.1111/rge.12305

  • Geology, geochemistry, and genesis of gold mineralization in the Chifumbazi deposit of the Tete Province, Irumide Belt, Mozambique

    Euclesia P.F. Cossa, Andrea Agangi, Ryohei Takahashi, Pearlyn Manalo, Akira Imai, Vicente Manjate

    Resource Geology   73 ( 1 )   2023.4

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    DOI: 10.1111/rge.12308

  • In-situ trace elements and sulfur isotopic analyses of stibnite: Constraints on the genesis of Sb/Sb-polymetallic deposits in southern China

    Zhekai Zhou, Huan Li, Kotaro Yonezu, Akira Imai, Thomas Tindell

    Journal of Geochemical Exploration   247   2023.4

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    DOI: 10.1016/j.gexplo.2023.107177

  • Primary source of placer gold in the Luk Ulo Metamorphic Complex, Central Java, Indonesia

    Renaldi Suhendra, Ryohei Takahashi, Akira Imai, Hinako Sato, Nugroho Imam Setiawan, Andrea Agangi

    Resource Geology   72 ( 1 )   2022.10

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    Language:Others   Publishing type:Research paper (scientific journal)  

    DOI: 10.1111/rge.12300

  • Primary source of placer gold in the Luk Ulo Metamorphic Complex, Central Java, Indonesia Reviewed International journal

    Suhendra, R., Takahashi, R., Imai, A., Sato, H., Setiawan, N. I. & Agangi, A.

    Resource Geology   72 ( 2 )   2022.10

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  • High temperature wall-rock alteration zoning in the Sanjin deposit, Hishikari gold mine, Japan: Implication for exploration of mature mining districts

    Yuji Gonoi, Akira Imai, Kotaro Yonezu, Thomas Tindell, Adrian J. Boyce, Jun ichiro Ishibashi

    Journal of Geochemical Exploration   240   2022.9

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    DOI: 10.1016/j.gexplo.2022.107018

  • Geological, mineralogical and ore fluid characteristics of the Tagun-Khin-Dan gold mineralization in Mogok-Mandalay-Mergui Belt, Central Myanmar Reviewed International journal

    Sone, S. P., Yonezu, K., Imai, A., Watanabe, K., Tindell, T. & Sanematsu, K.

    Resource Geology   72 ( 1 )   2022.9

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  • Geological, mineralogical and ore fluid characteristics of the Tagun-Khin-Dan gold mineralization in Mogok-Mandalay-Mergui Belt, Central Myanmar

    Sai Pyae Sone, Kotaro Yonezu, Akira Imai, Koichiro Watanabe, Thomas Tindell, Kenzo Sanematsu

    Resource Geology   72 ( 1 )   2022.8

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    DOI: 10.1111/rge.12298

  • Heterogeneity of mineral chemistry and sulfur isotopic composition of alunite in the Mankayan lithocap, northern Luzon, Philippines

    Pearlyn Manalo, Ryohei Takahashi, Akira Imai, Rhyza Ruth Parcon-Calamohoy, Mervin de los Santos, Leo Subang, Glenn Christian Alburo

    ORE GEOLOGY REVIEWS   146   2022.7

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    DOI: 10.1016/j.oregeorev.2022.104959

  • Genesis of magmatic ilmenite ores associated with the Mazua ultramafic intrusion, NE Mozambique

    David A.B. Unganai, Akira Imai, Ryohei Takahashi, Daud L. Jamal, Andrea Agangi, Takashi Hoshide, Hinako Sato

    Ore Geology Reviews   143   2022.4

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    DOI: 10.1016/j.oregeorev.2022.104760

  • Trace elements mineral chemistry of sulfides from the Woxi Au-Sb-W deposit, southern China Reviewed International journal

    Zhekai Zhou, Kotaro Yonezu, Akira Imai, Thomas Tindell, Huan Li, Jillian Aira Gabo-Ratio

    Resource Geology   70   2022.1

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  • Geology, mineralogy, and sulfur isotopes of the Mowana copper deposit, Matsitama Schist Belt, NE Botswana

    Amogelang Kooganne, Akira Imai, Andrea Agangi, Ryohei Takahashi

    Resource Geology   71 ( 4 )   320 - 338   2021.10

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    DOI: 10.1111/rge.12263

  • Geological and geochemical characterization of the Nanlia and Makorongo gold prospects, Mozambique Belt, northeastern Mozambique

    Ore Geology Reviews   135   2021.8

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    DOI: 10.1016/j.oregeorev.2021.104195

  • Gold mineralization of the Thone Myae Song area, Sagaing Region, northern Myanmar

    Htet Sandar Aung, Kotaro Yonezu, Akira Imai, Thomas Tindell, Koichiro Watanabe

    Journal of Asian Earth Sciences   214   2021.7

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    DOI: 10.1016/j.jseaes.2021.104749

  • Overprinting porphyry-type veinlets on the intrusive rocks and phreatomagmatic breccias in the Southwest prospect, southwestern Sto. Tomas II (Philex), Baguio District, Philippines

    Avriel Venis L. Cirineo, Akira Imai, Ryohei Takahashi, Redempta P. Baluda, Noel C. Oliveros, Victor B. Maglambayan, Roy Ronald C. Luis, Maria Lourdes M. Faustino, Jacky Almadin

    Resource Geology   71 ( 1 )   1 - 40   2021.1

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    DOI: 10.1111/rge.12242

  • Trace elements mineral chemistry of sulfides from the Woxi Au-Sb-W deposit, southern China

    Zhekai Zhou, Kotaro Yonezu, Akira Imai, Thomas Tindell, Huan Li, Jillian Aira Gabo-Ratio

    Resource Geology   72 ( 1 )   2021.1

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    DOI: 10.1111/rge.12279

  • Controls on the disseminated Ni-Cu-PGE sulfide mineralization at the Tubane section, northern Molopo Farms Complex, Botswana Implications for the formation of conduit style magmatic sulfide ores Reviewed

    Jacob Kaavera, Akira Imai, Kotaro Yonezu, Thomas David Tindell, Kenzo Sanematsu, Koichiro Watanabe

    Ore Geology Reviews   126   2020.11

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    DOI: 10.1016/j.oregeorev.2020.103731

  • Lithogeochemistry of hydrothermally-altered host rocks by multiple mineralizations in the Mankayan Mineral District, Philippines Reviewed

    Pearlyn C. Manalo, Akira Imai, Ryohei Takahashi, Hinako Sato, Leo Subang, Mervin de los Santos

    Journal of Geochemical Exploration   218   2020.11

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    DOI: 10.1016/j.gexplo.2020.106612

  • Controls on the disseminated Ni-Cu-PGE sulfide mineralization at the Tubane section, northern Molopo Farms Complex, Botswana: Implications for the formation of conduit style magmatic sulfide ores

    Jacob Kaavera, Akira Imai, Kotaro Yonezu, Thomas Tindell, Kenzo Sanematsu, Koichiro Watanabe

    Ore Geology Reviews   126   2020.11

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    DOI: 10.1016/j.oregeorev.2020.103731

  • Lithogeochemistry of hydrothermally-altered host rocks by multiple mineralizations in the Mankayan Mineral District, Philippines

    Pearlyn C. Manalo, Akira Imai, Ryohei Takahashi, Hinako Sato, Leo Subang, Mervin de los Santos

    Journal of Geochemical Exploration   218   2020.11

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    DOI: 10.1016/j.gexplo.2020.106612

  • Geochemistry and Fluid Inclusions Analysis of Vein Quartz in the Multiple Hydrothermal Systems of Mankayan Mineral District, Philippines Reviewed

    Pearlyn C. Manalo, Leo L. Subang, Akira Imai, Mervin C. de los Santos, Ryohei Takahashi, Nigel J.F. Blamey

    Resource Geology   70 ( 1 )   1 - 27   2020.1

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    DOI: 10.1111/rge.12214

  • Geology, Alteration, and Mineralization of the Kay Tanda Epithermal Gold Deposit, Lobo, Batangas, Philippines

    Sofia Marah P. Frias, Akira Imai, Ryohei Takahashi, Ma Ines Rosana Balangue-Tarriela, Carlo Arcilla, Nigel Blamey

    Resource Geology   69 ( 4 )   351 - 384   2019.10

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    DOI: 10.1111/rge.12205

  • Mineralogical and Geochemical Characteristics of the Utanobori Gold Deposit in Northern Hokkaido, Japan Reviewed

    Thomas T. Sorulen, Ryohei Takahashi, So Tanaka, Kana Suzuki, Akira Imai, Yasushi Watanabe, Shingo Kikuchi

    Resource Geology   69 ( 4 )   402 - 429   2019.10

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    DOI: 10.1111/rge.12211

  • A Low-Sulfidation Epithermal Mineralization in the River Reef Zone, the Poboya Prospect, Central Sulawesi, Indonesia Vein Textures, Ore Mineralogy, and Fluid Inclusions Reviewed

    Tomy Alvin Rivai, Kotaro Yonezu, Syafrizal, Kenzo Sanematsu, Damar Kusumanto, Akira Imai, Koichiro Watanabe

    Resource Geology   69 ( 4 )   385 - 401   2019.10

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    DOI: 10.1111/rge.12206

  • Mineralogical and Geochemical Characteristics of the Utanobori Gold Deposit in Northern Hokkaido, Japan

    Thomas T. Sorulen, Ryohei Takahashi, So Tanaka, Kana Suzuki, Akira Imai, Yasushi Watanabe, Shingo Kikuchi

    Resource Geology   69 ( 4 )   402 - 429   2019.10

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    DOI: 10.1111/rge.12211

  • A Low-Sulfidation Epithermal Mineralization in the River Reef Zone, the Poboya Prospect, Central Sulawesi, Indonesia: Vein Textures, Ore Mineralogy, and Fluid Inclusions

    Tomy Alvin Rivai, Kotaro Yonezu, Syafrizal, Kenzo Sanematsu, Damar Kusumanto, Akira Imai, Koichiro Watanabe

    Resource Geology   69 ( 4 )   385 - 401   2019.10

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    DOI: 10.1111/rge.12206

  • Geology, Alteration, and Mineralization of the Kay Tanda Epithermal Gold Deposit, Lobo, Batangas, Philippines Reviewed

    Sofia Marah P. Frias, Akira Imai, Ryohei Takahashi, Ma Ines Rosana Balangue-Tarriela, Carlo Arcilla, Nigel Blamey

    Resource Geology   2019.7

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    DOI: 10.1111/rge.12205

  • Geological and Geochemical Characteristics of Gold Mineralization in the Salu Bulo Prospect, Sulawesi, Indonesia Reviewed

    Muhammad Zain Tuakia, Ryohei Takahashi, Akira Imai

    Resource Geology   69 ( 2 )   176 - 192   2019.4

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    DOI: 10.1111/rge.12193

  • Geology and Skarn Cu–Bi–Au Mineralization at Shwe Min Bon Area, Kalaw Township, Southern Shan State, Myanmar

    69 ( 1 )   85 - 106   2019.1

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    © 2018 The Society of Resource Geology The Shwe Min Bon Cu–Au skarn deposit lies within one of the largest Au–Cu belts in Myanmar. The deposit is situated along the Shan scarp zone, which marks the boundary between the Myanmar central basin to the west and the Shan plateau to the east. The Shwe Min Bon deposit comprises skarn-type metasomatic alteration, and the Cu–Au mineralization occurs along the contact face between the Nwabangyi Dolomite and Shweminbon Formation and the Cretaceous dioritic rocks. The metasomatic process resulted in pro- and retrograde mineral assemblages in exoskarn. Hydrothermal activities in the Shwe Min Bon deposit are classified into prograde, retrograde stage I, and retrograde stage II. The prograde skarn is classified into a proximal garnet skarn with minor clinopyroxene and a distal wollastonite skarn. Chlorite, epidote, and tremolite–actinolite were formed during the retrograde stage I. Cu–Au mineralization mainly occurred in retrograde stage I, which was characterized by moderate temperatures (260–320 °C) and fluid with a moderate salinity (5.0–6.0% NaCl equiv.). Low temperature (180–200 °C) and low salinity (2.0–3.0% NaCl equiv.) were responsible for retrograde stage II. Au mineralization is mainly associated with chalcopyrite and tennantite in retrograde stage I and with tellurobismuthite in retrograde stage II.

    DOI: 10.1111/rge.12187

  • Geology and Skarn Cu–Bi–Au Mineralization at Shwe Min Bon Area, Kalaw Township, Southern Shan State, Myanmar Reviewed

    69 ( 1 )   85 - 106   2019.1

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    The Shwe Min Bon Cu–Au skarn deposit lies within one of the largest Au–Cu belts in Myanmar. The deposit is situated along the Shan scarp zone, which marks the boundary between the Myanmar central basin to the west and the Shan plateau to the east. The Shwe Min Bon deposit comprises skarn-type metasomatic alteration, and the Cu–Au mineralization occurs along the contact face between the Nwabangyi Dolomite and Shweminbon Formation and the Cretaceous dioritic rocks. The metasomatic process resulted in pro- and retrograde mineral assemblages in exoskarn. Hydrothermal activities in the Shwe Min Bon deposit are classified into prograde, retrograde stage I, and retrograde stage II. The prograde skarn is classified into a proximal garnet skarn with minor clinopyroxene and a distal wollastonite skarn. Chlorite, epidote, and tremolite–actinolite were formed during the retrograde stage I. Cu–Au mineralization mainly occurred in retrograde stage I, which was characterized by moderate temperatures (260–320 °C) and fluid with a moderate salinity (5.0–6.0% NaCl equiv.). Low temperature (180–200 °C) and low salinity (2.0–3.0% NaCl equiv.) were responsible for retrograde stage II. Au mineralization is mainly associated with chalcopyrite and tennantite in retrograde stage I and with tellurobismuthite in retrograde stage II.

    DOI: 10.1111/rge.12187

  • Mineralization of the Northwest quartz-pyrite-gold veins Implications for multiple mineralization events at lepanto, mankayan mineral district, Northern Luzon, Philippines Reviewed

    Pearlyn C. Manalo, Akira Imai, Leo L. Subang, Mervin C. De los Santos, Kyoka Yanagi, Ryohei Takahashi, Nigel J.F. Blamey

    Economic Geology   113 ( 7 )   1609 - 1626   2018.11

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    DOI: 10.5382/econgeo.2018.4606

  • The Kago low-sulfidation gold and silver deposit: A peripheral mineralisation to the Nansatsu high-sulfidation system, southern Kyushu, Japan

    Thomas Tindell, Koichiro Watanabe, Akira Imai, Ryohei Takahashi, Adrian J. Boyce, Kotaro Yonezu, Anders Schersten, Laurence Page, Takeyuki Ogata

    Ore Geology Reviews   102   951 - 966   2018.11

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    DOI: 10.1016/j.oregeorev.2017.10.027

  • Mineralization of the Northwest quartz-pyrite-gold veins: Implications for multiple mineralization events at lepanto, mankayan mineral district, Northern Luzon, Philippines

    Pearlyn C. Manalo, Akira Imai, Leo L. Subang, Mervin C. De los Santos, Kyoka Yanagi, Ryohei Takahashi, Nigel J.F. Blamey

    Economic Geology   113 ( 7 )   1609 - 1626   2018.11

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    DOI: 10.5382/econgeo.2018.4606

  • The Kago low-sulfidation gold and silver deposit A peripheral mineralisation to the Nansatsu high-sulfidation system, southern Kyushu, Japan Reviewed

    Thomas Tindell, Koichiro Watanabe, Akira Imai, Ryohei Takahashi, Adrian J. Boyce, Kotaro Yonezu, Anders Schersten, Laurence Page, Takeyuki Ogata

    Ore Geology Reviews   102   951 - 966   2018.11

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    DOI: 10.1016/j.oregeorev.2017.10.027

  • Petrochemistry of Granitoids Along the Loei Fold Belt, Northeastern Thailand Reviewed

    Patchawee Nualkhao, Ryohei Takahashi, Akira Imai, Punya Charusiri

    Resource Geology   68 ( 4 )   395 - 424   2018.10

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    DOI: 10.1111/rge.12176

  • Ore Genesis and Geochemical Characteristics of Carbonate-Hosted Talc Deposits in Nangarhar Province, Afghanistan Reviewed

    Muhammad Tahir, Akira Imai, Ryohei Takahashi, Shujiro Yano

    Resource Geology   68 ( 4 )   352 - 372   2018.10

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    DOI: 10.1111/rge.12174

  • Testing the Plagioclase Discriminator on the GEOROC Database to Identify Porphyry-Fertile Magmatic Systems in Japan Reviewed

    Benedict J. Williamson, Matthew Hodgkinson, Akira Imai, Ryohei Takahashi, Robin N. Armstrong, Richard J. Herrington

    Resource Geology   68 ( 2 )   138 - 143   2018.4

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    DOI: 10.1111/rge.12162

  • Study on Gold and base metal occurrence in Uluwai Prospect, Western Latimojong Mountain, South Sulawesi Reviewed

    Adi Maulana, Asri Jaya, Akira Imai

    2nd International Conference on Nuclear Technologies and Sciences, ICoNETS 2017 Journal of Physics: Conference Series   962 ( 1 )   2018.3

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    DOI: 10.1088/1742-6596/962/1/012011

  • Geochemical Behavior of Rare Earth Elements in Weathered Granitic Rocks in Northern Palawan, Philippines Invited Reviewed International journal

    Padrones, Jenielyn T., Imai, Akira, Takahashi, Ryohei

    RESOURCE GEOLOGY   67 ( 3 )   231 - 253   2017.7

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    DOI: 10.1111/rge.12123

  • Petrochemistry of Granitoids in Sibolga and its Surrounding Areas, North Sumatra, Indonesia Reviewed

    Iwan Setiawan, Ryohei Takahashi, Akira Imai

    Resource Geology   67 ( 3 )   254 - 278   2017.7

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    DOI: 10.1111/rge.12132

  • Imprints of Late Mesozoic tectono-magmatic events on Palawan Continental Block in northern Palawan, Philippines Reviewed International journal

    Padrones, Jenielyn T., Tani, Kenichiro, Tsutsumi, Yukiyasu, Imai, Akira

    JOURNAL OF ASIAN EARTH SCIENCES   142   56 - 76   2017.7

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    DOI: 10.1016/j.jseaes.2017.01.027

  • Characteristics and Behavior of Hydrothermal Fluids for Gold Mineralization at the Hishikari Deposits, Kyushu, Japan Invited Reviewed International journal

    Takahashi, Ryohei, Tagiri, Ryo, Blamey, Nigel J. F., Imai, Akira, Watanabe, Yasushi, Takeuchi, Akito

    RESOURCE GEOLOGY   67 ( 3 )   279 - 299   2017.7

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    DOI: 10.1111/rge.12136

  • Geology and geochemistry of granitoids associated with REE enrichment at Sibolga and its surroundings, North Sumatra, Indonesia Invited Reviewed International journal

    Setiawan, I., Takahashi, R., Imai, A.

    Resource Geology   67 ( 3 )   254 - 278   2017.7

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  • Petrochemistry of Late Cenozoic granitic rocks in Sulawesi, Indonesia: Origin and geodynamic setting Reviewed International journal

    Maulana, A., Imai, A., Koichiro Watanabe, KOTARO YONEZU, Nakano, T., Page, L., Schersten, A., Boyce, A., van Leewuen, T.

    Journal of Asian Earth Sciences.   124   102 - 125   2016.10

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  • Effect of NO2 in exhaust gas from an oxyfuel combustion system on the cap rock of a proposed CO2 injection site Reviewed International journal

    Tanaka, Kosuke, Okawa, Hirokazu, Hashimoto, Keiichiro, Takahashi, Ryohei;, Imai, Akira, Sugawara, Katsuyasu

    APPLIED GEOCHEMISTRY   70   17 - 26   2016.7

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    DOI: 10.1016/j.apgeochem.2016.04.007

  • Origin and geodynamic setting of Late Cenozoic granitoids in Sulawesi, Indonesia Reviewed

    Adi Maulana, Akira Imai, Theo Van Leeuwen, Koichiro Watanabe, Kotaro Yonezu, Takanori Nakano, Adrian Boyce, Laurence Page, Anders Schersten

    Journal of Asian Earth Sciences   124   102 - 125   2016.7

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    DOI: 10.1016/j.jseaes.2016.04.018

  • Fluid inclusion and stable isotopes study on the southeastern Martabe deposit: Purnama, Barani and Horas ore bodies, North Sumatra, Indonesia Reviewed International journal

    Saing, S., Takahashi, R., Imai, A.

    Resource Geology   66   127 - 148   2016.4

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  • Fluid Inclusion and Stable Isotope Study at the Southeastern Martabe Deposit : Purnama, Barani and Horas Ore Bodies, North Sumatra, Indonesia Reviewed

    SAING Stephanie, TAKAHASHI Ryohei, IMAI Akira

    Resource geology : an official journal of the Society of Resource Geology   66 ( 2 )   127 - 148   2016.4

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    Fluid Inclusion and Stable Isotope Study at the Southeastern Martabe Deposit Purnama, Barani and Horas Ore Bodies, North Sumatra, Indonesia
    The Martabe Au-Ag deposit, North Sumatra Province, Indonesia, is a high sulfidation epithermal deposit, which is hosted by Neogene sandstone, siltstone, volcanic breccia, and andesite to basaltic andesite of Angkola Formation. The deposit consists of six ore bodies that occurred as silicified massive ore (enargite-luzonite-pyrite-tetrahedrite-tellurides), quartz veins (tetrahedrite-galena-sphalerite-chalcopyrite), banded sulfide veins (pyrite-tetrahedrite-sphalerite-galena) and cavity filling. All ore bodies are controlled by N-S and NW-SE trending faults. The Barani and Horas ore bodies are located in the southeast of the Purnama ore body. Fluid inclusion microthermometry, and alunite-pyrite and barite-pyrite pairs sulfur isotopic geothermometry show slightly different formation temperatures among the ore bodies. Formation temperature and salinity of fluid inclusions of the Purnama ore body range from 200 to 260C and from 6 to 8wt.&#37; NaCl equivalent, respectively. Formation temperature and salinity of fluid inclusions of the Barani ore body range from 200 to 220°C and from 0 to 2.5wt.&#37; NaCl equivalent and those of the Horas ore body range from 240 to 275°C and from 2 to 3wt.&#37; NaCl equivalent, respectively. The Barani and Horas ore bodies are less silicified and sulfides are less abundant than the Purnama ore body. A relationship between enthalpy and chloride content indicates mixing of hot saline fluids with cooler dilute fluids during the mineralization of each of the ore bodies. The δ18O values of quartz samples from the southeast ore bodies exhibit a wide range from +4.2 to +12.9‰ with an average value of +7.0‰. The δ18O values of H2O estimated from δ18O values of quartz, barite and calcite confirm the oxygen isotopic shift to near meteoric water trend, which support the incorporation of meteoric water. Salinity of the fluid inclusions decrease from >5wt.&#37; NaCl equivalent in the Purnama ore body to <3wt.&#37; NaCl equivalent in the Barani ore body, indicating different fluid systems during mineralization. The δ34S values of sulfide and sulfate in Purnama range from-4.2 to +5.5‰ and from +1.2 to +26.7‰, those in the Barani range from-4.3 to +26.4‰ and from +3.9 to +18.5‰ and those in the Horas ore body range from-11.8 to +3.5‰ and from +1.4 to +25.7‰, respectively. The δ34S of total bulk sulfur in southeastern ore bodies (Σδ34S) was estimated to be approximately +6‰. The estimated sulfur fugacity during formation of the Purnama and Horas ore bodies is relatively high. It was between 10-4.8 and 10-10.8 atm at 220 to 260°C. Tellurium fugacity was between 10-7.8 and 10-9.5 atm at 260°C and between 10-9 and 10-10.6 atm at 220°C in the Purnama ore body. The Barani ore body was formed at lower fS2, lower than about 10-14 atm at 200 to 220°C based on the presence of arsenopyrite and pyrrhotite in the early stage, and between 10-14 and 10-12 atm based on the existence of enargite and tennantite in the last stage.

    DOI: 10.1111/rge.12093

  • Geochronology and magmatic evolution of the Dieng Volcanic Complex, Central Java, Indonesia and their relationships to geothermal resources Reviewed International journal

    Harijoko, Agung, Uruma, Ryusuke, Wibowo, Haryo Edi, Setijadji, Lucas Doni, Imai, Akira, KOTARO YONEZU, Koichiro Watanabe

    JOURNAL OF VOLCANOLOGY AND GEOTHERMAL RESEARCH   310   209 - 224   2016.1

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    DOI: 10.1016/j.jvolgeores.2015.12.010

  • Influence of phosphate on mobility and adsorption of REEs during weathering of granites in Thailand Reviewed International journal

    Sanematsu, Kenzo, Kon, Yoshiaki, Imai, Akira

    JOURNAL OF ASIAN EARTH SCIENCES   111   14 - 30   2015.11

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    DOI: 10.1016/j.jseaes.2015.05.018

  • Geophysical signatures of a terrane boundary in Northwest Panay, Philippines: Results from the gravity, seismic refraction and electrical resistivity investigations Reviewed International journal

    Gabo, J.A.S., Dimalanta, C.B., Yumul, G.P., Jr., Faustino-Eslava, D.V., Imai, A.

    Terrestrial, Atmospheric, and Oceanic Science   26 ( 6 )   663 - 678   2015.10

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    DOI: 10.3319/TAO.2015.05.11.03(TC)

  • Textural and Chemical Evolution of Unidirectional Solidification Textures in Highly Differentiated Granitic Rocks at Kharaatyagaan, Central Mongolia Reviewed International journal

    ERDENEBAYAR Jamsran, OGATA Takeyuki, IMAI Akira

    Resource geology : an official journal of the Society of Resource Geology   64 ( 4 )   283 - 300   2014.10

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    Textural and Chemical Evolution of Unidirectional Solidification Textures in Highly Differentiated Granitic Rocks at Kharaatyagaan, Central Mongolia
    Unidirectional solidification texture (UST) in an aplite body is recognized in the Neoproterozoic highly differentiated granitic rocks at Kharaatyagaan, central Mongolia. On the basis of crystal morphology, two main types of UST were identified in the aplite body: (i) thin crenulate UST layers; and (ii) thick intergrowth UST layers. Bulk geochemistry indicates that the Kharaatyagaan UST-bearing aplite and aplite dike are alkaline, and are enriched in light rare-earth elements. Scanning electron microscopy and cathadoluminescence imaging of UST quartz from Kharaatyagaan show four types of quartz: euhedral quartz phenocrysts with well-developed concentric growth zoning (Qa1) in the aplite; euhedral quartz with weak growth zoning in the aplite (Qa2); UST quartz exhibiting distinct growth zones (Qu1); and UST quartz showing mosaic texture (Qu2). Crystallization temperatures determined by the Ti-in-quartz geothermometer of Qa1 and Qu1 quartz range between around 500°C and 780°C and Qa2 and Qu2 range between about 490° and 630°C. The cathodoluminescence textures of quartz are predominantly caused by variations in the trace elements contents of quartz. The Qa1 and Qu1 quartz crystals are characterized by high Ti and Al concentrations in the quartz lattice, and are observed in the bottom of the Kharaatyagaan hill, which formed in the early, less evolved magmatic stage. The Qa2 and Qu2 UST quartz characterized by low Ti and variable Al concentrations are found at the top. The UST layers crystallized along the upper part of the magma chamber in the presence of fluid phases exsolved from felsic magma.

    DOI: 10.1111/rge.12050

  • Epithermal gold mineralization in the Trenggalek District, East Java, Indonesia Reviewed

    Resource Geology   64 ( 2 )   149 - 166   2014.4

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    DOI: 10.1111/rge.12034

  • Geochemistry of eclogite- and blueschist-facies rocks from the Bantimala Complex, South Sulawesi, Indonesia: Protolith origin and tectonic setting Reviewed International journal

    Maulana, Adi, Christy, Andrew G., Ellis, David J., Imai, Akira, Koichiro Watanabe

    ISLAND ARC   22 ( 4 )   427 - 452   2013.12

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    DOI: 10.1111/iar.12037

  • Ore-forming Ages and Sulfur Isotope Study of Hydrothermal Deposits in Kamchatka, Russia Reviewed International journal

    Takahashi, Ryohei, Matsueda, Hiroharu, Okrugin, Victor M., Shikazono, Naotatsu, Ono, Shuji, Imai, Akira, Andreeva, Elena D., Koichiro Watanabe

    RESOURCE GEOLOGY   63 ( 2 )   210 - 223   2013.7

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    DOI: 10.1111/rge.12005

  • Geochemical and mineralogical characteristics of ion-adsorption type REE mineralization in Phuket, Thailand Reviewed International journal

    Sanematsu, Kenzo, Kon, Yoshiaki, Imai, Akira, Koichiro Watanabe, Watanabe, Yasushi

    MINERALIUM DEPOSITA   48 ( 4 )   437 - 451   2013.4

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    DOI: 10.1007/s00126-011-0380-5

  • Geodynamic evolution of the Baguio Mineral District: Unlocking the Cenozoic record from clastic rocks Reviewed International journal

    Dimalanta, Carla B., Yumul, Graciano P., Jr., Imai, Akira

    JOURNAL OF ASIAN EARTH SCIENCES   65   118 - 130   2013.3

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    DOI: 10.1016/j.jseaes.2012.09.026

  • Rare Earth Elements in Hydrothermally Altered Granitic Rocks in the Ranong and Takua Pa Tin-Field, Southern Thailand Reviewed

    Akira Imai, Kotaro Yonezu, Kenzo Sanematsu, Takashi Ikuno, Shingo Ishida, Koichiro Watanabe, Visut Pisutha-Arnond, Somchai Nakapadungrat, Jarupong Boosayasak

    Resource Geology   63 ( 1 )   84 - 98   2013.1

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    DOI: 10.1111/j.1751-3928.2012.00212.x

  • Petrography, geochemistry, and tectonics of a rifted fragment of Mainland Asia: evidence from the Lasala Formation, Mindoro Island, Philippines Reviewed International journal

    Concepcion, R. A. B., Dimalanta, C. B., Yumul, G. P., Jr., Faustino-Eslava, D. V., Queano, K. L., Tamayo, R. A., Jr., Imai, A.

    INTERNATIONAL JOURNAL OF EARTH SCIENCES   101 ( 1 )   273 - 290   2012.1

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    DOI: 10.1007/s00531-011-0643-5

  • Laterization process of peridotites in Siruka, Choiseul, Solomon Islands Reviewed International journal

    Sagapoa, C. V., Imai, A., Ogata, T., KOTARO YONEZU, Koichiro Watanabe

    Jour. Southeast Asian Applied Geology,   3   76 - 92   2011.10

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  • Mercury and arsenic contamination from small scale gold mining activities at Selogiri area, Central Java, Indonesia Reviewed International journal

    Harijoko, A., Htun, T. M., Saputra, R., Warmada, I W., Setijadji, L. D., Imai, A., Koichiro Watanabe

    Jour. Southeast Asian Applied Geology   2   56 - 64   2010.10

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  • フィリピン、ルソン島北部、ヴィクトリア金鉱床におけるルソン銅鉱-ファマチナ鉱系鉱物

    田中 崇裕, 今井 亮, 渡邊 公一郎

    日本鉱物科学会年会講演要旨集   2010   259 - 259   2010.9

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    ヴィクトリア金鉱床は低硫化型浅熱水性鉱床に分類された。しかしながら、本研究で高硫化型の指標鉱物(例えば、ルソン銅鉱、硫砒銅鉱そしてコルース鉱)がヴィクトリア金鉱床の深部から確認された。ルソン銅鉱グループ鉱物と黄銅鉱はしばしば元々存在した鉱脈構成鉱物を置き換えている。このタイプのルソン銅鉱グループ鉱物はしばしば四面銅鉱グループ鉱物を置き換えており、黄銅鉱と共にしばしばサブミクロンオーダーの小規模フレーク状連晶組織や縞状組織を示す。これらの組織は四面銅鉱グループ鉱物を置き換えた中間生成物の分解によって形成されると考えられる。また、末期の鉱化流体は高硫化型に相当する。

    DOI: 10.14824/jakoka.2010.0.254.0

  • Petrological and Geochemical Characteristics of Intrusive Rocks Related to Porphyry Copper Mineralization and the Implications for the Genesis of Deposits in the Namosi area, Viti Levu, Republic of the Fiji Islands Reviewed International journal

    Tanaka, T., Akira Imai, Egashira, S., Sakomoto, S., Yasunaga, K.

    Resource Geology   60 ( 1 )   35 - 51   2010.1

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    DOI: 10.1111/j.1751-3928.2010.00113.x

  • Geology and geochemistry of the clastic sequences from Northwestern Panay (Philippines) Implications for provenance and geotectonic setting Reviewed International journal

    Tectonophysics   479 ( 1-2 )   111 - 119   2009.12

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    DOI: 10.1016/j.tecto.2009.02.004

    Other Link: doi:10.1016/jtecto.2009.02.004

  • Geology and geochemistry of the clastic sequences from Northwestern Panay (Philippines) Implications for provenance and geotectonic setting Reviewed

    Tectonophysics   479 ( 1-2 )   111 - 119   2009.12

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    DOI: 10.1016/j.tecto.2009.02.004

  • Recovery of Lithium from Geothermal Water by Manganese Oxide Adsorbent: Approach to the effective Utilization of Geothermal Resources International journal

    Huizi PIAO. Kotaro YONEZU, Yohei KAWABATA, Koichiro WATANABE, Akira IMAI and Takushi YOKOYAMA

    Proceedings of the 4th International Symposium of Novel Carbon Resource Sciences   2009.12

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  • Removal of Silicic Acid as Calcium Silicate and Uptake Behavior of Trace Elements International journal

    Kotaro YONEZU, Sachihiro SAKOMOTO, Koichiro WATANABE, Akira IMAI and Takushi YOKOYAMA

    Proceedings of the 4th International Symposium of Novel Carbon Resource Sciences   2009.12

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  • Preliminary Study on Orogenic Deposit Type as a Source of Placer Gold at Bombana, Southeast Sulawesi, Indonesia International journal

    Arifudin IDRUS, Akira IMAI, Andi MAKKAWARU, KAMRULLAH, I Wayan WARMADA, Irzal NUR and Rohaya LANGKOKE

    Proceedings of International Symposium on Earth Science and Technology   2009.12

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  • Preliminary Study on Orogenic Deposit Type as a Source of Placer Gold at Bombana, Southeast Sulawesi, Indonesia International journal

    Arifudin IDRUS, Akira IMAI, Andi MAKKAWARU, KAMRULLAH, I Wayan WARMADA, Irzal NUR and Rohaya LANGKOKE

    Proceedings of International Symposium on Earth Science and Technology   2009.12

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  • Fluid Inclusion Thermometry on Quartz Veins and Mineral Assemblages at Baturappe Area and Vicinity, Sulawesi Island, Indonesia International journal

    Yusuke JUYANAGI and Akira IMAI

    Proceedings of International Symposium on Earth Science and Technology   2009.12

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  • Characteristics of Epithermal Gold Mineralization in Tanggeung Area, Cianjur West Java, Indonesia International journal

    Cecep Y. SUNARIE, Mega F. ROSANA, Koichiro WATANABE and Akira IMAI

    Proceedings of International Symposium on Earth Science and Technology   2009.12

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  • Removal of Boron by Magnesium Silicate from Synthetic Geothermal Water International journal

    Yohei KAWABATA, Kotaro YONEZU, Koichiro WATANABE, Akira IMAI and Takushi YOKOYAMA

    Proceedings of International Symposium on Earth Science and Technology   2009.12

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  • Outline of Epithermal Gold Mineralization at Trenggalek Prospects, East Java, Indonesia International journal

    Yuki SHINGO, Akira IMAI, Ryohei TAKAHASHI, Koichiro WATANABE, Agung HARIJOKO, I Wayan WARMADA, Arifudin IDRUS, and Phouvang PHOUMEPHONE

    Proceedings of International Symposium on Earth Science and Technology   2009.12

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  • Mineralogical Characterization of Ore Minerals at the Victoria Low Sulfidation Epithermal Gold Deposit, Northern Luzon, Philippines International journal

    Takahiro TANAKA, Akira IMAI and Koichiro WATANABE

    Proceedings of International Symposium on Earth Science and Technology   2009.12

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  • Mineralization Style of the Charivunga Prospect, Gold Ridge Epithermal Au Deposit, Guadalcanal, Solomon Islands International journal

    Harrison GEDIKILE, Christopher V. SAGAPOA and Akira IMAI

    Proceedings of International Symposium on Earth Science and Technology   2009.12

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  • Fluid Inclusion and Geochemical Behaviour of The Kasuga High-Sulphidation Gold Deposit and Basement Veins, Kagoshima, Japan International journal

    Thomas TINDELL, Akira IMAI and Ryohei TAKAHASHI

    Proceedings of International Symposium on Earth Science and Technology   2009.12

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  • Characteristics of Calc-silicate Unit Related with Skarn Mineralization at Batu Hijau Porphyry Copper-gold Deposit, Sumbawa Island, Indonesia International journal

    May T. AYE, Akira IMAI, Subagyo PRAMUMIJOYO, Lucas D. SETIJADJI, Arifudin IDRUS and Johan ARIF

    Proceedings of International Symposium on Earth Science and Technology   2009.12

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  • Contents of Rare Earth Elements of Quartz Veins in the Hishikari Epithermal Gold Deposit: Preliminary Investigation by Laser Ablation ICP-MS International journal

    Kotaro YONEZU, Takushi YOKOYAMA, Akira IMAI and Koichiro WATANABE

    Proceedings of International Symposium on Earth Science and Technology   2009.12

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  • Applications of Digital Database and Geographical Information System to Earth Resources in Southeast Asia International journal

    Ryohei TAKAHASHI, Koichiro WATANABE, Akira IMAI, and Yuuki KOMATA

    Proceedings of International Symposium on Earth Science and Technology   2009.12

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  • Applications of Digital Database and Geographical Information System to Earth Resources in Southeast Asia International journal

    Ryohei TAKAHASHI, Koichiro WATANABE, Akira IMAI, and Yuuki KOMATA

    Proceedings of International Symposium on Earth Science and Technology   2009.12

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  • Geology and geochemistry of the clastic sequences from northwestern Panay (Philippines): Implications for provenance and geotectonic setting Invited Reviewed International journal

    Gabo, J. A. S., Dimalanta, C. B., Asio, M. G. S., Queano, K. L., Yumul, G. P., Jr. and Imai, A.

    Tectonophysics   2009.10

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  • Fluid inclusion study and opaque mineral assemblage at the deep and shallow part of the Batu Hijau porphyry Cu-Au deposit, Sumbawa, Indonesia Invited Reviewed International journal

    Imai, A. and Nagai, Y.

    Resour. Geol.,   2009.9

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  • Themetic Issue : Collection of Achievements on Earth Resources from AUN/SEED-Net, Part III Reviewed

    IMAI Akira, DIMALANTA Carla B., IDRUS Arifudin, WARMADA I. Wayan, HARIJOKO Agung

    Resource geology   59 ( 3 )   213 - 214   2009.9

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    Themetic issue Collection of achievements on earth resources from AUN/ SEED-Net, Part III

    DOI: 10.1111/j.1751-3928.2009.00091.x

  • Origin of Bornite Pods in Intrusive Rocks at the Kingking Porphyry Copper-gold Deposit, Southeastern Mindanao, Philippines Reviewed

    Imai Akira, Suerte Leilanie Osano, Nishihara Sho

    Resource geology   59 ( 3 )   307 - 313   2009.9

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    Origin of bornite pods in intrusive rocks at the kingking porphyry copper-gold Deposit, Southeastern Mindanao, Philippines
    At the Kingking porphyry copper-gold deposit, Compostela Valley, south-eastern Mindanao, Philippines, bornite pods occur in the brecciated parts in the biotite diorite porphyry, together with the volcanic rock and diorite fragments without associated stockworks of quartz veinlets. These pods are generally elongated in shape and measure several centimeters across their longest axes. They are composed of bornite and chalcopyrite with traces of calaverite. The δ34 S of bornite and subordinate chalcopyrite of bornite pods ranging from -2.2‰ to +0.1‰ are similar to the δ34 S of sulfides associated with quartz veinlets such as bornite and chalcopyrite ranging from -4.7‰ to ±0.0‰. This suggests that the ultimate source of sulfur is identical for bornite pods and sulfides associated with quartz veinlets. Bornite pods are associated with volcanic rock and dioritic fragments in the brecciated portion of the biotite diorite porphyry. It was observed that some dioritic fragments contain quartz veinlets, which may indicate an earlier episode of mineralization. Fragments of the earlier dioritic intrusive rocks and the volcanic rocks, together with the sulfides were incorporated into the biotite diorite porphyry magma. A molten sulfide is possible for the composition between bornite and intermediate solid solution at ∼800°C. The sulfides from the earlier dioritic intrusive rocks in the molten state were segregated and then eventually coalesce to form the bornite pods in the brecciated section of the biotite diorite porphyry.

    DOI: 10.1111/j.1751-3928.2009.00098.x

  • Geochemical Characteristics of Intrusive Rocks, Southeastern Mindanao, Philippines : Implication to Metallogenesis of Porphyry Copper-gold Deposits Reviewed

    Suerte Leilanie Osano, Imai Akira, Nishihara Sho

    Resource geology   59 ( 3 )   244 - 262   2009.9

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    Geochemical characteristics of intrusive rocks, Southeastern Mindanao, Philippines Implication to metallogenesis of porphyry copper-gold deposits
    This paper describes petrologic and geochemical characteristics of intrusive rocks associated with porphyry copper deposits in south-eastern Mindanao, the Philippines, where the Kingking deposit is located. Intrusive rocks at the Kingking deposit, are classified into biotite-bearing diorite porphyry, hornblende diorite porphyry and diorite porphyry. Intrusive rocks in other areas in south-eastern Mindanao, including Batoto, Bukal, Maragusan, Masara, Amacan and Sumlog, are hornblende diorite porphyry and hornblende quartz diorite. They are adakitic in Sr/Y-Y diagram, but not in La/Yb-Yb diagram due to relatively low REE contents. The magmas are oxidizing as suggested by the high X Mg of mafic silicate phenocrysts and SO 3 contents of microphenocrystic apatite. An Oligocene-Miocene diorite intrusive complex formed by calc-alkaline, hydrous, oxidizing magma is considered to be associated with porphyry-type copper-gold mineralization.

    DOI: 10.1111/j.1751-3928.2009.00094.x

  • Fluid Inclusion Study and Opaque Mineral Assemblage at the Deep and Shallow Part of the Batu Hijau Porphyry Copper-gold Deposit, Sumbawa, Indonesia Reviewed

    Imai Akira, Nagai Yuki

    Resource geology   59 ( 3 )   231 - 243   2009.9

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    Fluid inclusion study and opaque mineral assemblage at the deep and shallow part of the batu hijau porphyry copper-gold deposit, Sumbawa, Indonesia
    The Batu Hijau deposit is the only porphyry type deposit in production in the Sunda-Banda arc, Indonesia. This study discusses the reason for the localization of copper grade at the deep part of the deposit based on the observation of opaque mineral assemblage. In addition, the formation condition of quartz veins and opaque minerals is discussed on the basis of the fluid inclusion microthermometry. Samples were selected from drill holes SBD100, SBD168, SBD194, SBD254, and SBD257 to cover the wide vertical range. At the Batu Hijau deposit, quartz veins have been classified mainly into four types called A, B, C and D veins, and the A veins contain mainly bornite, often associated with digenite and chalcocite. In addition, magnetite occurs in A veins. However, at the deep part of the deposit, there are quartz veins associated with magnetite, but few copper sulfides such as bornite and chalcopyrite in quartz veins, as observed in SBD257. Quartz veins at depth in SBD257 have abundant magnetite and pyrite. Pyrite in quartz veins at depth in SBD257 mainly occur at the rim of magnetite grains or interstices between them. In quartz veins in SBD254, there are abundant copper sulfides such as bornite and chalcopyrite in spite of the depth. Bornite and chalcopyrite occur as inclusions in magnetite grains in quartz veins in SBD254. Pyrite which often occurs in low grade zone in quartz veins in SBD254 is also recognized at the rims of copper sulfides. This indicates that pyrite in SBD257 and SBD254 formed later than magnetite. On the other hand, blebs of bornite and chalcopyrite inclusions in magnetite grains, which are recognized in quartz veins in SBD168 at shallow high grade part, suggest that the hydrothermal fluid, from which magnetite was deposited also brought the copper sulfides such as bornite and chalcopyrite to the deep part of the Batu Hijau deposit. Therefore, it is concluded that initially the high grade ore zone extended to depth without localization. However due to the later overprinting hydrothermal activity, copper sulfides and magnetite were replaced or dissolved and pyrite was formed, resulting the low grade zone at the deep part of the deposit. Dissolution temperatures (Td) of halite obtained by from fluid inclusion microthermometry show significant differences between SBD168 and other drill holes. The high Td obtained in SBD168 may indicate larger volume of NaCl crystals in hydrothermal fluid at the time of entrapment of the fluid inclusions and formation of other opaque minerals such as magnetite and copper-iron sulfides. It suggests that the ratio of vapor to brine is also higher at the shallow part of the deposit. The higher vapor to brine ratio may suggest a higher degree of boiling. Removal of vapor phase separated from brine during boiling increases the concentration of substances dissolved in the brine, and this will result in saturation, as evidenced by the salinity and NaCl saturation. The higher degree of boiling suggested by the higher vapor to brine ratio at shallow part may have increased the copper concentration in the brine that may have lead the saturation, resulted in the deposition of copper-bearing minerals.

    DOI: 10.1111/j.1751-3928.2009.00093.x

  • Origin of bornite pods in intrusive rocks at the Kingking porphyry Cu-Au deposit, southeastern Mindanao, Philippines Invited Reviewed International journal

    Imai, A., Suerte, L. O. and Nishihara, S.

    Resour. Geol.   2009.9

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  • Geochemical characteristics of intrusive rocks, southeastern Mindanao, Philippines: Implication to metallogenesis of porphyry copper-gold deposits Invited Reviewed International journal

    Suerte, L. O., Imai, A. and Nishihara, S.

    Resour. Geol.   2009.9

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  • Rare Earth Elements in Weathered Crusts of Granitic Rocks in Southeast Asian Tin Belt (Northern Thailand, Southern Thailand (Ranong-Takua Pa-Phuket) and Bangka Island, Indonesia) International journal

    Akira IMAI, Takashi IKUNO, Kenzo SANEMATSU, Takafumi SUEOKA, Shingo ISHIDA, Koichiro WATANABE, Kong SITHA, Lucas Donny SETIJADJI and Jarupon BOOSAYASAK

    Proceedings of the 2nd Regional Conference Interdisciplinary Research on Natural Resources and Materials Engineering   2009.8

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  • Investigation on Rare Earth Elements Mineralization in Indonesia International journal

    Lucas Donny SETIJADJI, I Wayan WARMADA, Akira IMAI and Kenzo SANEMATSU

    Proceedings of the 2nd Regional Conference Interdisciplinary Research on Natural Resources and Materials Engineering   2009.8

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  • REE in Monzo-granites in Bangka Island, Indonesia International journal

    Kong SITHA, Lucas Donny SETIJADJI, Kenzo SANEMATSU, Takashi IKUNO, Akira IMAI, Arius DIMARA and Koichiro WATANABE

    Proceedings of the 2nd Regional Conference Interdisciplinary Research on Natural Resources and Materials Engineering   2009.8

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  • Rare Earth Resource Potential in Weathered Crust of Granitic Rocks in Southeast Asian Tin Belt International journal

    Akira IMAI, Takashi IKUNO, Kenzo SANEMATSU, Takafumi SUEOKA, Shingo ISHIDA, Koichiro WATANABE, Kong SITHA, Lucas Donny SETIJADJI and Jarupon BOOSAYASAK

    Proceedings of Earth Science International Conference   2009.8

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  • Hydrothermal Alteration Associated with Epithermal Gold Mineralization at Dalangturu and Suruh Prospects in Trenggalek Regency, East Java Island, Indonesia International journal

    Phovang PHOUMEPHONE, Agung HARIJOKO, I Wayan WARMADA, Akira IMAI, Ryohei TAKAHASHI and Yuki SHINGO

    Proceedings of Earth Science International Conference   2009.8

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  • Hydrothermal Alteration Associated with Epithermal Gold Mineralization at Dalangturu and Suruh Prospects in Trenggalek Regency, East Java Island, Indonesia International journal

    Phovang PHOUMEPHONE, Agung HARIJOKO, I Wayan WARMADA, Akira IMAI, Ryohei TAKAHASHI and Yuki SHINGO

    Proceedings of Earth Science International Conference   2009.8

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  • Occurrence of Skarn Mineralization in Deep Drill Holes at Batu Hijau Porphyry Copper-gold Deposit, SUmbawa Island, Indonesia International journal

    May T. AYE, Subagyo PRAMUMIJOYO, Lucas D. SETIJADJI, Arifudin IDRUS, Akira IMAI and Johan ARIF

    Proceedings of Earth Science International Conference   2009.8

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  • Landslide Triggering Factor in a Hydrothermally-altered Area, Case Study: Kasihan District, Pacitan Regency, East Java International journal

    I Wayan WARMADA, Agung HARIJOKO, Akira IMAI and Koichiro WATANABE

    Proceedings of Earth Science International Conference   2009.8

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  • Characteristics of Epithermal Quartz Veins at Baturappe Area, Gowa, South Sulawesi: Implication to Base Metal Exploration International journal

    Irzal NUR, Arifudin IDRUS, Subagyo PRAMUMIJOYO, Agung HARIJOKO, Yusuke JUYANAGI and Akira IMAI

    Proceedings of the International Seminar on Geology of the Southern Mountains of Java   2009.8

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  • Hydrothermal Alteration of Epithermal Gold Deposit at Dalangturu and Suruh Areas, Trenggalek Regency, East Java, Indonesia International journal

    Phovane PHOUMEPHONE, Agung HARIJOKO, I Wayan WARMADA, Akira IMAI, Ryohei TAKAHASHI and Yuki SHINGO

    Proceedings of the International Seminar on Geology of the Southern Mountains of Java   2009.8

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  • Porphyry Related Skarn Mineralization with Calc-silicate Rocks in Batu Hijau Deposit, Sumbawa Island, East Indonesia International journal

    May Thwe AYE, Subagyo PRAMUMIJOYO, Lucas Donny SETIJADJI, Arifudin IDURS and Akira IMAI

    Proceedings of the 2nd Regional Conference Interdisciplinary Research on Natural Resources and Materials Engineering   2009.8

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  • Characteristics of Rare Earth Elements in Quartz Veins of the Hishikari Epithermal Gold Deposit, Japan: Comparison between Bulk and Local Analyses International journal

    Kotaro YONEZU, Takushi YOKOYAMA, Akira IMAI and Koichiro WATANABE

    Proceeding of the 3rd International Workshop and Conference on Earth Resources Technology   2009.5

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  • Coprecipitation of Au(III) Complex Ions with Mn(II) Hydroxide as Gold Nanoparticles and Its Implication to Selective Recovery from Electronic Wastes International journal

    Chompunoot WIRASERANEE, Kotaro YONEZU, Takushi YOKOYAMA, Akira IMAI, Koichiro WATANABE, Quanchai LEEPAWPANTH and Dawan WIWATTANADATE

    Proceeding of the 3rd International Workshop and Conference on Earth Resources Technology   2009.5

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  • Genesis and Formation of Ore Deposits in Kamchatka Peninsula, Far Eastern Russia Reviewed International journal

    Ryohei Takahashi Koichiro Watanabe, Akira Imai, Hiroharu Matsueda, Victor M. Okurugin

    Proceedings of International Symposium on Earth Science and Technology 2008   2008.12

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  • Recovery of Precious Metals from Computer Microprocessor by Coprecipitation with Manganese Hydroxide Reviewed International journal

    Chumpunoot Wiraseranee, Kotaro Yonezu, Takushi Yokoyama, Dawan Witwattanadate, Quanchai Leepawpanth, Akira Imai, Koichiro Watanabe

    Proceedings of International Symposium on Earth Science and Technology 2008   2008.12

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  • Trace Element Composition of the Intrusive Rocks Related to Porphyry-type Copper Mineralization in Namosi District, Viti Levu, Republic of the Fiji Islands Reviewed International journal

    Takayuki Tanaka, Akira Imai, Saori Egashira, Kentaro Yasunaga, Katsuhiko Maeda

    Proceedings of International Symposium on Earth Science and Technology 2008   2008.12

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  • Fluid Inclusion and Sulfur Isotope Study on Porphyry Copper Deposit at the Waivaka Corridor Area, Namosi District, Viti Levu, Republic of Fiji Islands Reviewed International journal

    Saori Egashira, Akira Imai, Takayuki Tanaka, Kentaro Masaki, Kentaro Yasunaga, Katsuhiko Maeda

    Proceedings of International Symposium on Earth Science and Technology 2008   2008.12

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  • Granitic Rocks of Bangka Island (Tin Island), Indonesia and Their Associated Mineralization: A Review and Potential of Unexplored Deposits Reviewed International journal

    Kong Sitha, Lucas Donny Setijadji, Kenzo Sanematsu, Takashi Ikuno, Akira Imai, Arius Dimara, Koichiro Watanabe

    Proceedings of International Symposium on Earth Science and Technology 2008   2008.12

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  • Rare Earth Elements in Weathered Crust in Sn-bearing Granitic Rocks in Southern Thailand Reviewed International journal

    A. Imai, K. Sanematsu, S. Ishida, K. Watanabe, J. Boosayasak

    Proceedings of the International Symposia on Geoscience Resources and Environments of Asian Terranes, Special Issue of Bulletin of Earth Sciences of Thailand   2008.11

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  • Alkali silica reactivity of various andesites in saturated NaCl solution

    K. Yamada, T. Fujii, A. Imai, Y. Kawabata, H. Matsushita

    4th International Structural Engineering and Construction Conference, ISEC-4 - Innovations in Structural Engineering and Construction Proceedings of the 4th International Structural Engineering and Construction Conference, ISEC-4 - Innovations in Structural Engineering and Construction   525 - 531   2008.11

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  • コリア半島,遂安銅鉱化地域に見られるジュラ紀花崗岩類の岩石化学的特性について Reviewed

    石原舜三・今井 亮・平野英雄

    資源地質   2008.8

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  • Integrating potential field with remote sensing data for geological investigations in the Eljufra area of Libya Reviewed International journal

    Saadi, N. M., Watanabe, K., Imai, A., Saibi, H.

    Earth, Planet, Space   2008.6

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  • Enrichment of Rare Earth Elements Associated with Granitic Rocks, Southern Thailand Reviewed International journal

    Akira Imai, Kenzo Sanematsu, Shingo Ishida, Koichiro Watanabe, Jarupong Boosayasak

    Proceedings of the 2nd International Workshop and Conference on Earth Resources Technology   2008.4

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  • Interaction Between Gold(I) Complexes and the Surface of Metal Sulfides (Fe2S and Ag2S) Reviewed International journal

    Kotaro Yonezu, Tomoaki Shibao, Takushi Yokoyama, Akira Imai, Koichiro Watanabe

    Proceedings of the 2nd International Workshop and Conference on Earth Resources Technology   2008.4

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  • Study on Porphyry-type Copper Mineralization at the Waivaka Corridor Area, Namosi District, Viti Levu, Republic of the Fiji Islands Reviewed International journal

    Saori Egashira, Akira Imai, Takayuki Tanaka, Kentaro Masaki, Kentaro Yasunaga, Katsuhiko Maeda

    Proceedings of the 2nd International Workshop and Conference on Earth Resources Technology   2008.4

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  • Petrography and Petrochemical Characteristics of the Intrusive Rocks Related to Porphyry Copper Mineralization in Namosi District, Viti Levu, Republic of the Fiji Island Reviewed International journal

    Takayuki Tanaka, Akira Imai, Saori Egashira, Sachihiro Sakomoto, Kentaro Yasunaga

    Proceedings of the 2nd International Workshop and Conference on Earth Resources Technology   2008.4

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  • Integrating potential fields with remote sensing data for geological investigations in the Eljufra area of Libya Reviewed

    Nureddin Mohamed Saadi, Koichiro Watanabe, Akira Imai, Hakim Saibi

    earth, planets and space   60 ( 6 )   539 - 547   2008.1

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    DOI: 10.1186/BF03353116

  • Uptake of boron and gold by calcium silicate hydrate (CSH): Application for effective utilization of geothermal energy at geothermal power plant and the recovery of are metals from geothermal water Reviewed International journal

    Sakomoto Sachihiro, Yonezu Kotaro, Okaue Yoshihiro, Yokoyama Takushi, Imai Akira, Watanabe Koichiro

    Proceedings of 5the Internationas Symposium on Earth Science and Technology   2007.12

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  • Characteristics of Porphyry Cu Mineralization at Waisoi (Namosi District), Viti Levu, Fiji Reviewed

    Imai Akira, Ohbuchi Yukiko, Tanaka Takayuki, MORITA Seiya, YASUNAGA Kentaro

    Resource geology   57 ( 4 )   374 - 385   2007.12

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    Characteristics of porphyry Cu mineralization at Waisoi (Namosi District), Viti Levu, Fiji
    The porphyry Cu deposits at Waisoi in Namosi district, Viti Levu are separated into two deposits: the Waisoi East deposit and the Waisoi West deposit. In the Waisoi East deposit, quartz porphyry is exposed and in the Waisoi West deposit, diorite porphyry is sporadically exposed in addition to a small body of quartz porphyry. The mineralization in the Waisoi East deposit is characterized by the bornite-chalcopyrite-pyrite assemblage associated with traces of molybdenite and native gold. Polyphase fluid inclusions in stockwork quartz veinlets show homogenization temperatures ranging from 210 to >500°C. The high-grade Cu mineralization in the Waisoi West deposit is characterized by the bornite-chalcopyrite-pyrite assemblage accompanied with sheeted and stockwork quartz veinlets. Polyphase fluid inclusions occasionally containing hematite flakes in quartz veinlets in the center of the Waisoi West deposit homogenize at temperatures ranging from 450°C to >500°C. However, fluid inclusions in stockwork quartz veinlets in the periphery, homogenize at lower temperatures around 210°C. Both in the Waisoi East and Waisoi West deposits, primary bornite-chalcopyrite-pyrite assemblage in the high Cu-grade zone was deposited at the upper stability limit of chalcopyrite with respect to sulfur fugacity. Thus, the principal Cu mineralization at the Waisoi deposits occurred at a relatively high sulfur fugacity, that is, in a high-sulfidation environment.

    DOI: 10.1111/j.1751-3928.2007.00031.x

  • Fluid inclusion study and opaque mineral assemblage in quartz veins at deep and shallow part of the Batu Hijau porphyry Cu-Au deposit, Sumbawa, Indonesia Reviewed International journal

    Nagai Yuki, Imai Akira

    Proceedings of 5the Internationas Symposium on Earth Science and Technology   2007.12

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  • Characteristics of the Seisen veins, Hishikari gold deposits, Japan Reviewed International journal

    Tohma Yuki, Imai Akira, Watanabe Koichiro, Sanematsu Kenzo

    Proceedings of 5the Internationas Symposium on Earth Science and Technology   2007.12

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  • Petrography and chemical composition on the intrusive rocks related to porpghyry-type copper mineralization in Namosi district, Viti Levu, Republic of the Fiji Isalnds Reviewed International journal

    Tanaka Takayuki, Imai Akira, Egashira Saori, Sakomoto Sachihiro, Yasunaga Kentaro

    Proceedings of 5the Internationas Symposium on Earth Science and Technology   2007.12

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  • Migration of subduction in central Java, Indonesia Reviewed International journal

    Uruma Ryusuke, Kohno Yasuaki, Watanabe Koichiro, Imai Akira, Itaya Tetsumaru, Setijadji Lucas Donny, Harijoko Agung

    Proceedings of 5the Internationas Symposium on Earth Science and Technology   2007.12

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  • Coprecipitation of Au(I) complex anions by aluminum hydroxide Reviewed International journal

    Yonezu Kotaro, Okaue Yoshihiro, Yokoyama Takushi, Imai Akira, Watanabe Koichiro

    Proceedings of 5the Internationas Symposium on Earth Science and Technology   2007.12

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  • Characteristics of intrusive rocks associated with copper mineralization at the Waivala Corridor area, Namosi district, Viti Levu, Republic of the Fiji Islands Reviewed International journal

    Egashira Saori, Tanaka Takayuki, Masaki Kentaro, Imai Akira, Yasunaga Kentaro, Maeda Katsuhiko

    Proceedings of 5the Internationas Symposium on Earth Science and Technology   2007.12

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  • Porphyry-type copper mineralization at the Waivaka Corridor area, Namosi district, Viti Levu, Republic of the Fiji Islands Reviewed International journal

    Egashira Saori, Masaki Kentaro, Imai Akira, Tanaka Takayuki, Yasunaga Kentaro, Maeda Katsuhiko

    4th International Symposium on Gondwana to Asia and 2007 IAGR Annual Convention   2007.11

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  • Migration of subduction degrees in central Java, Indonesia Reviewed International journal

    Uruma Ryusuke, Kohno Yasuaki, Watanabe Koichiro, Imai Akira, Itaya Tetsumaru, Setijadji Lucas Donny, Harijoko Agung

    4th International Symposium on Gondwana to Asia and 2007 IAGR Annual Convention   2007.11

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  • The Seisen vines, Hishikari epithermal gold deposits, Japan: microscopic observation and fluid inclusions Reviewed International journal

    Tohma Yuki, Watanabe Koichiro, Imai Akira, Sanematsu Kenzo

    4th International Symposium on Gondwana to Asia and 2007 IAGR Annual Convention   2007.11

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  • Petrological study on the intrusive rocks related to porphyry-type copper mineralization in Namosi district, Viti Levu, Republic of the Fiji Islands Reviewed International journal

    Tanaka Takayuki, Egashira Saori, Sakomoto Sachihiro, Imai Akira, Yasunaga Kentaro, Maeda Katsuhiko

    4th International Symposium on Gondwana to Asia and 2007 IAGR Annual Convention   2007.11

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  • Island arc growth, metallogeny, and volcanic hazard risks of western Sunda arc: clarifying the significance of Gondwana crust Reviewed International journal

    Setijadji Lucas donny, Watanabe Koichiro, Imai Akira, Wibowo Haryo Edi, Barianto Didit Hadi, Itaya Tetsumaru

    4th International Symposium on Gondwana to Asia and 2007 IAGR Annual Convention   2007.11

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  • Deposition model of copper sulfides and ore genesis of the Batu Hijau porphyry Cu-Au deposit, Sumbawa, Indonesia Reviewed International journal

    Nagai Yuki, Imai Akira

    4th International Symposium on Gondwana to Asia and 2007 IAGR Annual Convention   2007.11

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  • Study on hydrothermal alteration in Kasihan area, East Java, Indonesia Reviewed International journal

    Fukuda Kazuchika, Imai Akira, Warmada I Wayan, Titisari Anastasia Dewi, Idrus Arifudin, Tun Myo Min, Furqon Reza Al, Saldi Rizza Nurarfi

    4th International Symposium on Gondwana to Asia and 2007 IAGR Annual Convention   2007.11

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  • Special issue: achievements on earth resources from AUN/SEED-Net, Part 2 Reviewed

    Imai A., Dimalanta C.B., Harijoko A.

    Resource geology   57 ( 2 )   99 - 101   2007.6

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    About the special issue Collection of achievements on earth resources from AUN/SEED-Net, part II

    DOI: 10.1111/j.1751-3928.2007.00009.x

  • Porphyry-type mineralization at Selogiri Area, Wonogiri Regency, Central Java, Indonesia Reviewed

    Akira Imai, Jumpei Shinomiya, Maung Thiha Soe, Lucas Donny Setijadji, Koichiro Watanabe, I. Wayan Warmada

    Resource Geology   57 ( 2 )   230 - 240   2007.6

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    DOI: 10.1111/j.1751-3928.2007.00019.x

  • Origin of ore-forming fluids responsible for gold mineralization of the Pongkor Au-Ag deposit, West Java, Indonesia Evidence from mineralogic, fluid inclusion microthermometry and stable isotope study of the Ciurug-Cikoret veins Reviewed

    Syafrizal, Akira Imai, Koichiro Watanabe

    Resource Geology   57 ( 2 )   136 - 148   2007.6

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    DOI: 10.1111/j.1751-3928.2007.00013.x

  • Occurrences of ore minerals and fluid inclusion study on the Kingking Porphyry copper-gold deposit, Eastern Mindanao, Philippines Reviewed

    Leilanie O. Suerte, Sho Nishihara, Akira Imai, Koichiro Watanabe, Graciano P. Yumul, Victor B. Maglambayan

    Resource Geology   57 ( 2 )   219 - 229   2007.6

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    DOI: 10.1111/j.1751-3928.2007.00018.x

  • Characteristics of the Cibaliung Gold Deposit : Miocene Low-Sulfidation-Type Epithermal Gold Deposit in Western Java, Indonesia Reviewed

    Harijoko Agung, Ohbuchi Yukiko, Motomura Yoshinobu, IMAI Akira, WATANABE Koichiro

    Resource geology   57 ( 2 )   114 - 123   2007.6

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    Characteristics of the Cibaliung gold deposit Miocene low-sulfidation-type epithermal gold deposit in Western Java, Indonesia
    Middle Miocene (11.18-10.65 Ma) low sulfidation-type epithermal gold mineralization occurred in the Cibaliung area, southwestern part of Java Island, Indonesia. It is hosted by andesitic to basaltic andesitic lavas of the Middle Miocene Honje Formation (11.4 Ma) and is covered by Pliocene Cibaliung tuff (4.9 Ma). The exploration estimates mineral resource of approximately 1.3 million tonnes at 10.42 g/t gold and 60.7 g/t silver at a 3 g/t Au cut-off. This equates to approximately 435,000 ounces of gold and 2.54 million ounces of silver. That resource resulted from two ore shoots: Cibitung and Cikoneng. Studies on ore mineralogy, hydrothermal alteration, geology, fluid inclusion, stable isotopes and age dating were conducted in order to characterize the deposit and to understand a possible mechanism of preservation of the deposit. The ore mineral assemblage of the deposit consists of electrum, naumannite, Ag-Se-Te sulfide minerals, chalcopyrite, pyrite, sphalerite and galena. Those ore minerals occur in quartz veins showing colloform-crustiform texture. They are enveloped by mixed layer clay illite/smectite zone, which grades into smectite zone outward. The temperature of mineralization revealed by fluid inclusion study on quartz in the veins ranges from 170 and 220°C at shallow and deep level, respectively. The temperature range is in agreement with the temperature deduced from the hydrothermal alteration mineral assemblage including mixed layered illite/smectite and laumontite. The mineralizing fluid is dilute, with a salinity <1 wt&#37; NaCl equivalent and has stable isotopes of oxygen and hydrogen composition indicating a meteoric water origin. Although the deposit is old enough that it would have been eroded in a tropical island arc setting, the coverage by younger volcanic deposits such as the Citeluk tuff and the Cibaliung tuff most probably prevented this erosion.

    DOI: 10.1111/j.1751-3928.2007.00011.x

  • 菱刈金鉱床中の希土類元素の地球化学

    米津 幸太郎, 安松 愛, 岡上 吉広, 今井 亮, 渡邊 公一郎, 横山 拓史

    希土類 = Rare earths   ( 50 )   160 - 161   2007.5

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  • Geology of metallic deposits in Java island (Indonesia) with a special reference to the island arc magmatism International journal

    Setijadji Lucas Donny, Imai Akira, Itaya Tetsumaru, Watanabe Koichiro

    Proceedings of the International Workshop on Earth Resources Technology   2007.4

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  • Characteristics of the mineralization at the Wainaoulo-Southeast area, Namosi district, Viti Levu, Republic of the Fiji Islands International journal

    Egashira Saori, Imai Akira, Tanaka Takayuki, Yasunaga Kentaro, Maeda Katsuhiko

    Proceedings of the International Workshop on Earth Resources Technology   2007.4

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  • Adsorption behavior of gold(I)-thiosulfate complex anions onto the surface of manganese dioxide: approach the recovery of gold from geothermal waters International journal

    Sakomoto Sachihiro, Yonezu Kotaro, Yokoyama Takushi, Okaue Yoshihiro, Imai Akira, Watanabe Koichiro

    Proceedings of the International Workshop on Earth Resources Technology   2007.4

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  • Diorites and their roles in the mineralization of southeastern MIndanao, Philippines International journal

    Suerte Leilanie Osano, Nishihara Sho, Imai Akira, Watanabe Koichiro

    Proceedings of the International Workshop on Earth Resources Technology   2007.4

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  • Study on the determination of trace elements in siliceous deposits formed from hydrothermal water by ICP-MS International journal

    Yonezu Kotaro, Yokoyama Takushi, Motomura Yoshinobu, Imai Akira, Watanabe Koichiro

    Proceedings of the International Workshop on Earth Resources Technology   2007.4

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  • Implication of the temporal sulphur isotopic variation during the 2000 eruption of Miyakejima Volcano, Japan Reviewed

    IMAI AKIRA, GESHI NOBUO, SHIMANO TAKETO, NAKADA SETSUYA

    The Island arc   16 ( 1 )   83 - 92   2007.3

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    Implication of the temporal sulphur isotopic variation during the 2000 eruption of Miyakejima Volcano, Japan
    The variation of sulphur isotopic composition during the 2000 eruption of the Miyakejima Volcano was examined in order to monitor the temporal change of the volcanic activity. The δ34S values of water-soluble sulphate leached from volcanic ash effused during intermittent eruptions from July to September 2005 range from +5 to +11‰ with a fluctuation of ca 3‰ within a single eruption. The δ34S value of sulphuric acid mist collected with 'Cu-metal trap' placed on the flank of the volcano from December 2000 to January 2001 is +6.2‰. These sulphur isotopic compositions of sulphate, which were isotopically equilibrated in the subvolcanic hydrothermal system, indicate that the temperature of the hydrothermal system beneath the caldera increased after the period of intermittent phreatic and phreatomagmatic eruptions. Then, the δ34S value of sulphuric acid trapped from January to March 2001 was +9.0‰ and the δ34S value of water-soluble sulphate on volcanic ash emitted with minor eruption in May 2001 was +11.0‰, suggesting a decrease in temperature of the subvolcanic hydrothermal system.

    DOI: 10.1111/j.1440-1738.2007.00549.x

  • Cenozoic island arc magmatism in Java Island (Sunda Arc, Indonesia) Clues on relationships between geodynamics of volcanic centers and ore mineralization Reviewed

    Lucas Donny Setijadji, Shigeo Kajino, Akira Imai, Koichiro Watanabe

    Resource Geology   56 ( 3 )   267 - 292   2006.9

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    DOI: 10.1111/j.1751-3928.2006.tb00284.x

  • Sulfur isotope study on Hg and Sb deposits in Japan Reviewed

    Akira Imai, Naotatsu Shikazono, Masaaki Shimizu, Hidehiko Shimazaki

    Resource Geology   56 ( 1 )   37 - 48   2006.3

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    DOI: 10.1111/j.1751-3928.2006.tb00266.x

  • Discovery of the oldest oxic granitoids in the Kaapvaal Craton and its implications for the redox evolution of early Earth Reviewed

    Shunso Ishihara, Hiroshi Ohmoto, Carl R. Anhaeusser, Akira Imai, Laurence J. Robb

    Memoir of the Geological Society of America   198   67 - 80   2006.1

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    DOI: 10.1130/2006.1198(04)

  • インドネシア,西ジャワ,ポンコール金銀鉱床のチウルグ脈の金鉱化作用の特徴 Reviewed

    Syafrizal, 今井 亮, 本村 慶信

    55 ( 3 )   225 - 238   2005.9

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    DOI: 10.1111/j.1751-3928.2005.tb00244.x

  • Primary ore mineral assemblage and fluid inclusion study of the Batu Hijau porphyry Cu-Au deposit, Sumbawa, Indonesia Reviewed

    IMAI A.

    Resource Geology   55 ( 3 )   239 - 248   2005.9

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    Primary ore mineral assemblage and fluid inclusion study of the Batu Hijau porphyry Cu-Au deposit, Sumbawa, Indonesia
    The Batu Hijan porphyry Cu-Au deposit, Sumbawa Island, Indonesia, is associated with a tonalitic intrusive complex. The temperature-pressure condition of mineralization at the Batu Hijau deposit is discussed on the basis of fluid inclusion microthermometry. Then, the initial Cu-Fe sulfide mineral assemblage is discussed. Bornite and chalcopyrite are m ajor copper ore minerals associated with quartz veinlets. The quartz veinlets have been classified into 'A' veinlets associated with bornite, digenite, chalcocite and chalcopyrite, 'B' veinlets having chalcopyrite± bornite along vuggy center-line, rare 'C' chalcopyrite-quartz veinlets, and late 'D' veinlets consisting of massive pyrite and quartz (Clode et al., 1999). Copper and gold mineralization is associated with abundant 'A' quartz veinlets. Abundant fluid inclusions are found in veinlet quartz consisting mainly of gas-rich inclusions and polyphase inclusions throughout the veinlet types. The hydrothermal activity occurred in temperature-pressure conditions of aqueous fluid immiscibility into hypersaline brine and dilute vapor. The halite dissolution (Tm[halite]) and liquid-vapor homogenization (Th) temperatures of the polyphase inclusions in veinlet quartz range from 270 to 472°C and from 280 to 454°C, respectively. The estimated salinity ranges from 36 to 47 wt&#37; (NaCl equiv.). The apparent pressures lower than 300 bars are estimated to have been along the liquid-vapor-halite curve for the fluid inclusions having the Th lower than the Tm that trapped the brine saturated with halite, or at slightly higher pressure relative to liquid-vapor-halite curve for the fluid inclusions having the Th higher than the Tm that trapped the brine unsaturated with halite. The actual temperature and pressure during the hydrothermal activity at the Batu Hijau deposit are estimated to have been around 300°C and 50 bars. At such temperature-pressure conditions, the principal and initial Cu-Fe sulfide mineral assemblages are thought to be chalcopyrite + bornite solid solution (bnss) for the chalcopyrite-bearing assemblage, and chalcocite-digenite solid solution and bnss for the chalcopyrite-free assemblage.

    DOI: 10.1111/j.1751-3928.2005.tb00245.x

  • Evolution of hydrothermal system at the Dizon porphyry Cu-Au deposit, Zambales, Philippines Reviewed

    IMAI A.

    Resour. Geol.   55 ( 2 )   73 - 90   2005.6

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    Evolution of hydrothermal system at the Dizon porphyry Cu-Au deposit, Zambales, Philippines
    Evolution of hydrothermal system from initial porphyry Cu mineralization to overlapping epithermal system at the Dizon porphyry Cu-Au deposit in western central Luzon, Zambales, Philippines, is documented in terms of mineral paragenesis, fluid inclusion petrography and microthermometry, and sulfur isotope systematics. The paragenetic stages throughout the deposit are summarized as follows; 1) stockwork amethystic quartz veinlets associated with chalcopyrite, bomite, magnetite and Au enveloped by chlorite alteration overprinting biotite alteration, 2) stockwork quartz veinlets with chalcopyrite and pyrite associated with Au and chalcopyrite and pyrite stringers in sericite alteration, 3) stringer quartz veinlets associated with molybdenite in sericite alteration, and 4) WNW-trending quartz veins associated with sphalerite and galena at deeper part, while enargite and stibnite at shallower levels associated with advanced argillic alteration. Chalcopyrite and bomite associated with magnetite in quartz veinlet stockwork (stage 1) have precipitated initially as intermediate solid solution (iss) and bomite solid solution (bnss), respectively. Fluid inclusions in the stockwork veinlet quartz consist of gas-rich inclusions and polyphase inclusions. Halite in polyphase inclusions dissolves at temperatures ranging from 360°C to >500°C but liquid (brine) and gas (vapor) do not homogenize at <500°C. The maximum pressure and minimum temperature during the deposition of iss and bnss with stockwork quartz veinlets are estimated to be 460 bars and 500°C. Fluid inclusions in veinlet stockwork quartz enveloped in sericite alte ration (stage 2) consist mainly of gas-rich inclusions and polyphase inclusions. In addition to the possible presence of saturated NaCl crystals at the time of entrapment of fluid inclusions that exhibit the liquid-vapor homogenization temperatures lower than the halite dissolution temperatures in some samples, wide range of temperatures of halite dissolution and liquid-vapor homogenization of polyphase inclusions from 230°C to >500°C and from 270°C to >500°C, respectively, suggests heterogeneous entrapment of gaseous vapor and hypersaline brine. The minimum pressure and temperature are estimated to be about 25 bars and 245°C. Fluid inclusions in veinlet quartz associated with molybdenite (stage 3) are dominated by gas-rich inclusions accompanied with minor liquid-rich inclusions that homogenize at temperatures between 350°C and 490°C. Fluid inclusions in vuggy veinlet quartz associated with stibnite (stage 4) consist mainly of gas-rich inclusions with subordinate polyphase inclusions that do not homogenize below 500°C. Fluid inclusions in veinlet quartz associated with galena and sphalerite (stage 4) are composed of liquid-rich two-phase inclusions, and they homogenize into liquid phase at temperatures ranging widely from 190°C to 300°C (suggesting boiling) and the salinity ranges from 1.0 wt&#37; to 3.4 wt&#37; NaCl equivalent. A pressure of about 15 bars is estimated for the dilute aqueous solution of 190°C from which veinlet quartz associated with galena and sphalerite precipitated. In addition to a change in temperature-pressure regime from lithostatic pressure during the deposition of iss and bnss with stockwork quartz veinlets to hydrostatic pressure during fracture-controlled quartz veinlet associated with galena and sphalerite, a decrease in pressure is supposed to have occurred due to unroofing or removal of the overlying piles during the temperature decrease in the evolution of hydrothermal system. The majority of the sulfur isotopic composition of sulfides ranges from ±0‰, to +5 ‰. Sulfur originated from an isotopically uniform and homogeneous source, and the mineralization occurred in a single hydrothermal system.

    DOI: 10.1111/j.1751-3928.2005.tb00230.x

  • A study on the formation of smectite in silica scales precipitated from geothermal water The effect of magnesium Reviewed

    Yoshinobu Aramaki, Takushi Yokoyama, Yoshihiro Okaue, Akira Imai, Koichiro Watanabe

    Resource Geology   55 ( 3 )   281 - 284   2005.1

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    DOI: 10.1111/j.1751-3928.2005.tb00248.x

  • Short contribution Using sulfur isotopes to determine the sources of vermillion in ancient burial mounds in Japan Reviewed

    Takeshi Minami, Akira Imai, Michiaki Bunno, Kunihiko Kawakami, Setsuo Imazu

    Geoarchaeology   20 ( 1 )   79 - 84   2005.1

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    DOI: 10.1002/gea.20035

  • Geochronological constraints using 40AR/39AR dating on the mineralization of the Hishikari epithermal gold deposit, Japan Reviewed

    Kenzo Sanematsu, Robert Duncan, Akira Imai, Koichiro Watanabe

    Resource Geology   55 ( 3 )   249 - 266   2005.1

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    DOI: 10.1111/j.1751-3928.2005.tb00246.x

  • About the special issue Collection of achievements on Earth Resources from AUN/SEED-net Reviewed

    Akira Imai, Carla B. Dimalanta, Graciano P. Yumul, Lucas Donny Setijadji, Koichiro Watanabe

    Resource Geology   55 ( 3 )   141 - 144   2005

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    DOI: 10.1111/j.1751-3928.2005.tb00236.x

  • Occurrence of halogen-rich phlogopite in Late Cenozoic volcanic rocks in the Japanese arcs Reviewed

    IMAI A.

    Resource Geol.   54 ( 2 )   153 - 166   2004.6

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    Occurrence of halogen-rich phlogopite in Late Cenozoic volcanic rocks in the Japanese arcs
    Halogen-rich phlogopite occurs in the groundmass of andesite and dacite lavas from Late Tertiary to Quaternary volcanoes associated with native sulfur and limonite deposits (Shiretoko-Iwozan, Hachimantai, Adatara, Omeshidake, Masaki) and hydrothermal ore deposits (Harukayama, Muineyama, Hishikari) in Japan. The F contents of the halogen-rich phlogopite range from 3.6 to 5.7 wt&#37;, corresponding to atomic F/(F+Cl+OH) ratios ranging from 0.45 to 0.69. On the other hand, the Cl contents of the halogen-rich phlogopite are around 0.2 wt&#37;. The atomic Mg/(Mg+Fe) ratios range from 0.69 to 0.83. The fluorine intercept value [IV(F)] defined by Munoz (1984) of the phlogopites ranges from 0.79 to 3.17, and the chlorine intercept value [IV(Cl)] ranges from -7.11 to -7.77. The observed IV(F) of the phlogopites broadly overlap the range of the IV (F) for biotites from porphyry copper deposits. On the other hand, the observed IV(Cl) are significantly lower than the IV(Cl) for biotites from porphyry copper deposits. Whereas the F contents of the phlogopite appear more prominent compared to the Cl contents, the calculation of halogen intercept values revealed that the phlogopites are enriched in Cl with respect to the element distribution effect of Mg-Fe substitution. Since the degree of Cl enrichment of the phlogopite is more significant compared to that of biotite in porphyry copper deposits, the phlogopites are considered to have formed under the condition of significantly high activity of halogens. Hydrothermal ore deposits may be formed in magmatic hydrothermal system associated with volcanoes where halogen-rich phlogopite is formed by hypersaline fluid.

    DOI: 10.1111/j.1751-3928.2004.tb00196.x

  • Variation of Cl and SO_3 Contents of Microphenocrystic Apatite in Intermediate to Silicic Igneous Rocks of Cenozoic Japanese Island Arcs : Implications for Porphyry Cu Metallogenesis in the Western Pacific Island Arcs Reviewed

    IMAI A.

    Resour. Geol.   54 ( 3 )   357 - 372   2004.1

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    Variation of Cl and SO3 contents of microphenocrystic apatite in intermediate to silicic igneous rocks of Cenozoic Japanese island arcs Implications for porphyry Cu metallogenesis in the western Pacific island arcs
    Determinations of SO3 and Cl contents of igneous accessory apatite were carried out on Late Cenozoic intermediate to silicic intrusive and volcanic rocks in the Japanese island arcs of the western Pacific rim including the southwestern Kuril arc (eastern Hokkaido), Northeast Japan arc (southwestern Hokkaido through northeastern Honshu to central Honshu), Izu-Bonin arc, Kyushu-Palau ridge, Southwest Japan arc (northern Kyushu) and northern Ryukyu arc (southern Kyushu). These were compared to those from the Western Luzon arc, Philippines, to better understand the metallogenesis of porphyry Cu deposits in the western Pacific island arcs. In addition, SO3 and Cl contents of accessory apatite in the Cretaceous magnetite-series granitic rocks in the Kitakami belt (northeastern Honshu) and the Miocene ilmenite-series granitic rocks in the Outer Zone of Southwest Japan (southern Kyushu) were also examined. Microphenocrystic apatites in shallow intrusions associated with porphyry Cu deposits in the Western Luzon arc contain >0.1 wt&#37; S as SO3. Such high SO3 contents of microphenocrystic apatite are a common characteristic of hydrous magmatism in the Western Luzon arc, from 15 Ma old tonalitic plutonic rocks of the Luzon Central Cordillera to present-day volcanism at Mount Pinatubo. The accessory apatite in intrusive rocks associated with porphyry Cu deposits, especially those at the Santo Tomas II deposit, show significantly high Cl contents (>2 wt&#37;). The SO3 contents of microphenocrystic apatite in most of the hydrous silicic rocks along the volcanic front, in andesites related to native sulfur deposits, and in Miocene and younger shallow granitic intrusions in northeastern Honshu, are generally <0.1 wt&#37;. On the other hand, the SO3 contents of apatite in such rocks from eastern Hokkaido, southwestern Hokkaido, Izu, northern Kyushu and southern Kyushu are similar to those from the Western Luzon arc. The SO 3 contents of accessory apatite in the Cretaceous magnetite-series granitic rocks in the Kitakami belt are variable, whereas those of the Miocene ilmenite-series granitic rocks in southern Kyushu are extremely low. The Cl contents of accessory apatite in some rocks of the Northeast Japan arc, Izu-Bonin arc and Southwest Japan arc are significantly high. In terms of the Cl and SO3 contents of microphenocrystic apatite, Cenozoic Japanese arc magmatism show similarities with arc magmatism associated elsewhere with porphyry Cu mineralization, except for the most of northeastern Honshu of the Northeast Japan arc. Apatite commonly occurs as inclusions in other phenocrystic phases. Thus the variation in SO3 contents of apatite is a feature of early stage magmatic differentiation. The SO 3 contents of microphenocrystic apatite are considered to reflect the redox state of the magma source region or fluids encountered during magma generation.

    DOI: 10.1111/j.1751-3928.2004.tb00211.x

  • Association of electrum and calcite and its significance to the genesis of the Hishikari gold deposits, southern Kyushu, Japan. Invited Reviewed International journal

    Imai, A. and Uto, T.

    Resource Geology   2002.12

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    Association of electrum and calcite and its significance to the genesis of the Hishikari gold deposits, southern Kyushu, Japan.

  • Victoria Carbonate-Base Metal Gold Deposit and Its Significance in the Mankayan Mineral District, Luzon, Philippines Reviewed

    Fernando G. Sajona, Eiji Izawa, Yoshinobu Motomura, Akira Imai, Hiroyuki Sakakibara, Koichiro Watanabe

    Resource Geology   52 ( 4 )   315 - 328   2002.12

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    DOI: 10.1111/j.1751-3928.2002.tb00142.x

  • Association of Electrum and Calcite and Its Significance to the Genesis of the Hishikari Gold Deposits, Southern Kyushu, Japan

    Akira Imai, Tadakazu Uto

    Resource Geology   52 ( 4 )   381 - 394   2002.12

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    DOI: 10.1111/j.1751-3928.2002.tb00148.x

  • Victoria carbonate-base metal gold deposit and its significance in the Mankayan mineral district, Luzon, Philippines. Invited Reviewed International journal

    Sajona, F. G., Izawa, E., Motomura, Y., Imai, A., Sakakibara, H. and Watanabe, K.

    Resource Geology   2002.12

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    Victoria carbonate-base metal gold deposit and its significance in the Mankayan mineral district, Luzon, Philippines.

  • 千葉県房総半島南端の千倉層群白浜層(上部鮮新統)に発達するゼオライト脈 Reviewed

    井上厚行, 小竹信広, 坂庭康友, 今井亮

    地質学雑誌   2002.9

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  • Granitoid series in terms of magnetic susceptibility: A case study from the Barberton region, South Africa

    S Ishihara, LJ Robb, CR Anhaeusser, A Imai

    GONDWANA RESEARCH   5 ( 3 )   581 - 589   2002.7

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    DOI: 10.1016/S1342-937X(05)70630-4

  • Granitoid series in terms of magnetic susceptibility: A case study from the Archean Barberton Region, South Africa. Reviewed International journal

    Ishihara, S., Robb, L. J., Anhaeusser, C. L. and Imai, A.

    Gondwana Research   2002.6

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    ranitoid series in terms of magnetic susceptibility: A case study from the Archean Barberton Region, South Africa.

  • Metallogenesis of porphyry Cu deposits of the western Luzon arc, Philippines K-Ar ages, SO3 contents of microphenocrystic apatite and significance of intrusive rocks Reviewed

    Akira Imai

    Resource Geology   52 ( 2 )   147 - 161   2002.1

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    DOI: 10.1111/j.1751-3928.2002.tb00127.x

  • 八幡平南東部地熱地域に分布するNa系変質帯の成因: 下降する地表水と化石海水の関与した水ム岩石反応 Reviewed

    井上厚行, 原淳子, 今井亮

    資源地質   2001.10

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  • Further occurrence of brown ores in Kuroko-type deposits in Japan. Reviewed International journal

    Imai, A., Ishizuka, O., Yamada, R. and Miyamoto, H.

    Resource Geology   2001.9

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    Further occurrence of brown ores in Kuroko-type deposits in Japan.

  • Further occurrence of brown ores in Kuroko-type deposits in Japan

    Akira Imai, Osamu Ishizuka, Ryoichi Yamada, Hiroshi Miyamoto

    Resource Geology   51 ( 3 )   263 - 268   2001.9

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    DOI: 10.1111/j.1751-3928.2001.tb00098.x

  • Generation and evolution of ore fluids for porphyry Cu-Au mineralization at the Santo Tomas II (Philex) deposit, Philippines. Invited Reviewed International journal

    Imai, A.

    Resource Geology   2001.6

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    Generation and evolution of ore fluids for porphyry Cu-Au mineralization at the Santo Tomas II (Philex) deposit, Philippines.

  • Generation and evolution of ore fluids for porphyry Cu-Au mineralization of the Santo Tomas II (Philex) deposit, Philippines

    Akira Imai

    Resource Geology   51 ( 2 )   71 - 96   2001.6

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    DOI: 10.1111/j.1751-3928.2001.tb00083.x

  • Horizontal strain rate in relation to vein formation of the Hishikari gold deposits, southern Kyushu, Japan. Reviewed International journal

    Uto, T., Imai, A. and Yamato, Y.

    Resource Geology   2001.3

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    Horizontal strain rate in relation to vein formation of the Hishikari gold deposits, southern Kyushu, Japan.

  • Horizontal strain rate in relation to vein formation of the Hishikari gold deposits, Southern Kyushu, Japan

    Tadakazu Uto, Akira Imai, Yu Yamato

    Resource Geology   51 ( 1 )   7 - 18   2001.3

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    DOI: 10.1111/j.1751-3928.2001.tb00077.x

  • Sulfur isotope study and re-examination of ore mineral assemblage of the Hol Kol and the Tul Mi Chung skarn-type copper-gold deposits of the Suan mining district, Korean Peninsula. Invited Reviewed International journal

    Imai, A. and Anan, S.

    Resource Geology   2000.12

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    Sulfur isotope study and re-examination of ore mineral assemblage of the Hol Kol and the Tul Mi Chung skarn-type copper-gold deposits of the Suan mining district, Korean Peninsula.

  • Sulfur isotope study and re-examination of ore mineral assemblage of the Hol Kol and the Tul Mi Chung Skarn-type copper-gold deposits of the Suan Mining District, Korean Peninsula

    Akira Imai, Shin'ichi Anan

    Resource Geology   50 ( 4 )   213 - 228   2000.12

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    DOI: 10.1111/j.1751-3928.2000.tb00071.x

  • Geneses of high chlorine and silver-lead-zinc-mineralized granitoids in Tsushima, Japan. Reviewed International journal

    Ishihara, S. and Imai, A.

    Resource Geology   2000.9

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    Geneses of high chlorine and silver-lead-zinc-mineralized granitoids in Tsushima, Japan.

  • Mineral paragenesis, fluid inclusions and sulfur isotope systematics of the Lepanto Far Southeast porphyry Cu-Au deposit, Mankayan, Philippines

    Akira Imai

    Resource Geology   50 ( 3 )   151 - 168   2000.9

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    DOI: 10.1111/j.1751-3928.2000.tb00065.x

  • Geneses of high chlorine and silver-lead-zinc-mineralized granitoids in Tsushima, Japan Reviewed

    Shunso Ishihara, Akira Imai

    Resource Geology   50 ( 3 )   169 - 178   2000.9

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    DOI: 10.1111/j.1751-3928.2000.tb00066.x

  • Sulfur isotopic study of the Toyoha deposits, Hokkaido, Japan -Comparison between the earlier-stage and later-stage veins-. Reviewed International journal

    Hamada, M. and Imai, A.

    Resource Geology   2000.6

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    Sulfur isotopic study of the Toyoha deposits, Hokkaido, Japan -Comparison between the earlier-stage and later-stage veins-.

  • Genesis of the Mamut porphyry copper deposit, Sabah, East Malaysia

    Akira Imai

    Resource Geology   50 ( 1 )   1 - 23   2000.3

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    DOI: 10.1111/j.1751-3928.2000.tb00052.x

  • Sulfur isotopic study of the Toyoha deposit, Hokkaido, Japan - Comparison between the earlier-stage and the later-stage veins - Reviewed

    Morihisa Hamada, Akira Imai

    Resource Geology   50 ( 2 )   113 - 122   2000.1

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    DOI: 10.1111/j.1751-3928.2000.tb00061.x

  • Pyrite disease in luzonite from the Lepanto Cu-Au deposit, Mankayan, Philippines: Further example of disease texture and its origin. Reviewed International journal

    Imai, A.

    Resource Geology   1999.9

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    Pyrite disease in luzonite from the Lepanto Cu-Au deposit, Mankayan, Philippines: Further example of disease texture and its origin.

  • Pyrite disease in Luzonite from the Lepanto Cu-Au deposit, Mankayan, Philippines: Further example of disease texture and its origin

    Akira Imai

    Resource Geology   49 ( 3 )   163 - 168   1999.9

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    DOI: 10.1111/j.1751-3928.1999.tb00042.x

  • Polymetallic mineralization at the Shin-Ohtoyo deposit, Harukayama district, Hokkaido, Japan

    Akira Imai, Hiroharu Matsueda, Ryoichi Yamada, Kenzo Masuta

    Resource Geology   49 ( 2 )   75 - 88   1999.6

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    DOI: 10.1111/j.1751-3928.1999.tb00033.x

  • A Kuroko-type polymetallic sulfide deposit in a submarine silicic caldera

    K Iizasa, RS Fiske, O Ishizuka, M Yuasa, J Hashimoto, J Ishibashi, J Naka, Y Horii, Y Fujiwara, A Imai, S Koyama

    SCIENCE   283 ( 5404 )   975 - 977   1999.2

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    DOI: 10.1126/science.283.5404.975

  • Spinifex texture of native sulfur A cooling product of sulfur flow eruptions at Shiretoko-Iwozan volcano, Hokkaido, Japan Reviewed

    Akira Imai, Nobuo Geshi

    Resource Geology   49 ( 2 )   99 - 104   1999.1

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    DOI: 10.1111/j.1751-3928.1999.tb00035.x

  • Hydrogen Isotope Study of Fluid Inclusions in Vein Quartz of the Hishikari Gold Deposits, Japan

    Akira Imai, Hidehiko Shimazaki, Tomoko Nishizawa

    Resource Geology   48 ( 3 )   159 - 170   1998.9

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    DOI: 10.1111/j.1751-3928.1998.tb00014.x

  • Hydrogen Isotope Study of Fluid Inclusions in Vein Quartz of the Hishikari Gold Deposits, Japan Reviewed

    Akira Imai, Hidehiko Shimazaki, Tomoko Nishizawa

    Resource Geology   48 ( 3 )   159 - 170   1998.9

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    DOI: 10.1111/j.1751-3928.1998.tb00014.x

  • "Brown Ore" from the Fukasawa Kuroko Deposits, Northeast Japan Its Characteristics and Formation Process Reviewed

    Osamu Ishizuka, Akira Imai

    Resource Geology   48 ( 2 )   53 - 73   1998.6

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    DOI: 10.1111/j.1751-3928.1998.tb00007.x

  • Geology, Mineralogy, and Formation Environment of the Disseminated Gold-Silver Telluride Bulawan Deposit, Negros Occidental, Philippines Reviewed

    Victor B. Maglambayan, Daizo Ishiyama, Toshio Mizuta, Akira Imai, Yohei Ishikawa

    Resource Geology   48 ( 2 )   87 - 104   1998.6

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    DOI: 10.1111/j.1751-3928.1998.tb00009.x

  • DEVELOPMENT OF A LARGELY ANOXIC STRATIFIED OCEAN AND ITS TEMPORARY MASSIVE MIXING AT THE PERMIAN TRIASSIC BOUNDARY SUPPORTED BY THE SULFUR ISOTOPIC RECORD

    Y KAJIWARA, S YAMAKITA, K ISHIDA, H ISHIGA, A IMAI

    PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY   111 ( 3-4 )   367 - 379   1994.10

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    DOI: 10.1016/0031-0182(94)90072-8

  • Development of a largely anoxic stratified ocean and its temporary massive mixing at the Permian/Triassic boundary supported by the sulfur isotopic record Reviewed

    Yoshimichi Kajiwara, Satoshi Yamakita, Kotaro Ishida, Hiroaki Ishiga, Akira Imai

    Palaeogeography, Palaeoclimatology, Palaeoecology   111 ( 3-4 )   367 - 379   1994.10

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1016/0031-0182(94)90072-8

  • SULFIDE GLOBULES ASSOCIATED WITH A FELSITE INTRUSION IN THE MOUNT KINABALU QUARTZ MONZONITE, SABAH, EAST MALAYSIA - SULFIDE MELT IMMISCIBILITY IN A HIGHLY SILICIC MEAT

    A IMAI

    ECONOMIC GEOLOGY AND THE BULLETIN OF THE SOCIETY OF ECONOMIC GEOLOGISTS   89 ( 1 )   181 - 185   1994.1

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    DOI: 10.2113/gsecongeo.89.1.181

  • Sulfide globules associated with a felsite intrusion in the Mount Kinabalu quartz monzonite, Sabah, east Malaysia; sulfide melt immiscibility in a highly silicic melt Reviewed

    A. Imai

    Economic Geology   89 ( 1 )   181 - 185   1994.1

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    DOI: 10.2113/gsecongeo.89.1.181

  • PETROLOGIC AND SULFUR ISOTOPIC SIGNIFICANCE OF HIGHLY OXIDIZED AND SULFUR-RICH MAGMA OF MT-PINATUBO, PHILIPPINES

    A IMAI, EL LISTANCO, T FUJII

    GEOLOGY   21 ( 8 )   699 - 702   1993.8

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    DOI: 10.1130/0091-7613(1993)021<0699:PASISO>2.3.CO;2

  • Petrologic and sulfur isotopic significance of highly oxidized and sulfur-rich magma of Mt. Pinatubo, Philippines Reviewed

    A. Imai, E. L. Listanco, T. Fujii

    Geology   21 ( 8 )   699 - 702   1993.1

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    DOI: 10.1130/0091-7613(1993)021<0699:PASISO>2.3.CO;2

  • Sulfur isotopic data from the Permian/Triassic boundary at Tenjinmaru in the Chichibu Terrane in eastern Shikoku, Japan Reviewed

    Y. Kajiwara, S. Yamakita, D. Kobayashi, A. Imai

    Annual Report - University of Tsukuba, Institute of Geoscience   19   59 - 65   1993.1

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  • Tectonic implications of the hydrated garnet peridotites near Mt Kinabalu, Sabah, East Malaysia Reviewed

    Akira Imai, Kazuhito Ozawa

    Journal of Southeast Asian Earth Sciences   6 ( 3-4 )   431 - 445   1991.1

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    DOI: 10.1016/0743-9547(91)90086-D

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Books

  • Resource Geology Thematic Issue: Collection of Achievements on Earth Resources from AUN/SEED-Net III.

    A. Imai, C. B. Dimalanta, A. Idrus, I W. Warmada and A. Harijoko( Role: Edit)

    Wiley  2009.10 

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  • Resource Geology Special Issue: Achievements on Earth Resource from AUN/SEED-Net Part II

    A. Imai, C. B. Dimalanta, A. Harijoko( Role: Edit)

    Society of Resource Geology  2007.6 

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  • Resource Geology Special Issue: : Achievements on Earth Resource from AUN/SEED-Net

    A. Imai, C. B. Dimalanta, G. P. Yumul, Jr., l. D. Setijadji, K. Watanabe( Role: Edit)

    Society of Resource Geology  2005.9 

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    Language:English   Book type:Scholarly book

  • Resource Geology Special Issue: Papers Presented at the International Symposium on Gold and Hydrothermal Systems

    E. IZAWA, K. WATANABE, A. IMAI( Role: Edit)

    Society of Resource Geology  2002.12 

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  • Resource Geology Special Issue: Mineralization and Hydrothermal Systems in the Philippines

    G. P. YUMUL, Jr., A. IMAI( Role: Edit)

    Society of Resource Geology  2001.6 

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    Language:English   Book type:Scholarly book

  • Proceedings of International Workshop on earth Resources Technology

    Imai Akira, Pinyo Meechumna, Watanabe Koichiro( Role: Edit)

    2007.12 

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Presentations

  • Rare Earth Elements in Granitic Rocks in Southwest Asian Tin Belt Invited International conference

    Akira Imai

    Mining & Exploration Symposium  2019.2 

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    Event date: 2019.2

    Language:English   Presentation type:Oral presentation (general)  

    Country:Botswana  

  • Rare Earth Elements in Weathered Crust in Tin-bearing Granitic Rocks in Southeast Asia Tin Belt Invited International conference

    A. Imai, T. Ikuno, K. Sanematsu, T. Sueoka, S. Ishida, K. Watanabe, K. Sitha, L. D. Setijadji, J. Boosayasak

    2009.6 

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    Event date: 2009.6

    Language:Others   Presentation type:Oral presentation (general)  

    Country:Japan  

  • REE Behavior in Weathered and Fresh Granitic Rocks in Bangka Island, Indonesia

    T. Ikuno, A. Imai, K. Sanematsu, L.D.Setijadji, K. Sitha, A. Dimara

    2009.6 

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    Language:Others   Presentation type:Oral presentation (general)  

    Country:Japan  

  • Outline of Epithermal Prospect at Batu Rappe Area, Southern Sulawesi, Indonesia

    Y. Juyanagi, A. Imai, I Nur

    2009.6 

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    Language:Others   Presentation type:Oral presentation (general)  

    Country:Japan  

  • Characteristics of Gold Prospects at Trenggalek, East Java, Indonesia

    Y. Shingo, A. Imai, R. Tahkahashi, K. Watanabe, A. Harijoko, I W Warmada, A. Idrus, P. Phoumephone

    2009.6 

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    Event date: 2009.6

    Language:Others   Presentation type:Oral presentation (general)  

    Country:Japan  

  • 硫化鉱物に対する一価金の金−チオ硫酸塩錯体の吸着挙動

    川畑陽平, 米津幸太郎, 柴尾友彰, 渡邊公一郎, 今井亮, 横山拓史

    2009.6 

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    Language:Others   Presentation type:Oral presentation (general)  

    Country:Japan  

  • 極東ロシア、カムチャッカ半島における火山−地熱−温泉活動の地球化学的特徴

    高橋亮平, 米津幸太郎, 松枝大治, V.M.Okrugin, E.D.Andreeva, 渡邊公一郎, 今井亮

    2009.6 

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    Event date: 2009.6

    Language:Others   Presentation type:Oral presentation (general)  

    Country:Japan  

  • タイ北部花崗岩地域における希土類元素の資源ポテンシャル Invited

    今井亮, 末岡貴文, 実松健造

    2009.5 

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    Event date: 2009.5

    Language:Others   Presentation type:Oral presentation (general)  

    Country:Japan  

  • インドネシア バンカ島における花崗岩風化殻中の希土類元素含有量調査

    生野貴士, 今井亮, 実松健造

    2009.5 

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    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  • Genesis and Formation of Ore Deposits in Kamchatka Peninsula, Far Eastern Russia International conference

    Ryohei Takahashi, Koichiro Watanabe, Akira Imai, Hiroharu Matsueda, Victor Okurugin

    International Symposium on Earth Sicence and Technology 2008  2008.12 

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    Event date: 2008.12

    Language:Others   Presentation type:Oral presentation (general)  

    Country:Japan  

  • Trace Element Composition of the Intrusive Rocks Related to Porphyry-type Copper Mineralization in Namosi District, Viti Levu, Republic of the Fiji Islands International conference

    Takayuki Tanaka, Akira Imai, saori Egashira, kentaro Yasunaga, Katsuhiko Maeda

    International Symposium on Earth Science and Technology 2008  2008.12 

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    Event date: 2008.12

    Language:Others   Presentation type:Oral presentation (general)  

    Country:Japan  

  • Fluid Inclusion and Sulfur Isotope Study on Porphyry Copper Deposit at the Waivaka Corridor Area, Namosi District, Viti Levu, Republic of Fiji Islands International conference

    Saori Egashira, Akira Imai, Takayuki Tanaka, Kentaro Masaki, Kentaro Yasunaga, Katsuhiko Maeda

    International Symposium on Earth Sicence and Technology 2008  2008.12 

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    Event date: 2008.12

    Language:Others   Presentation type:Symposium, workshop panel (public)  

    Country:Japan  

  • Granitic Rocks of Bangka Island (Tin Island). Indonesia, and Their Associated Mineralization: A Review and Potential of Unexplored Deposits International conference

    Kong Sitha. Lucas Donny Setijadji, Kenzo Sanematsu, Takashi Ikuno, Akira Imai, Arius Dimara, Koichiro Watanabe

    International Symposium on Earth Sicence and Technology 2008  2008.12 

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    Event date: 2008.12

    Language:Others   Presentation type:Symposium, workshop panel (public)  

    Country:Japan  

  • Recovery of Precious Metals from Computer Microprooessor by Coprecipitation with Manganese Hydroxide International conference

    Chumpunoot Wiraseranee, Kotaro Yonezu, Takushi Yokoyama, Dawan Wiwattanadate, Quanchai Leepawpanth, Akira Imai, Koichiro Watanabe

    International Symposium on Earth Sicence and Technology 2008  2008.12 

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    Event date: 2008.12

    Language:Others   Presentation type:Oral presentation (general)  

    Country:Japan  

  • Rare Earth Elements in Weathered Crust in Sn-bearing Granitic Rocks in Southern Thailand International conference

    A. Imai, K. Sanematsu, S. Ishida, K. Watanabe, J. Boosayasak

    International Symposia on Geoscience Resources and Environment of Asian Terranes  2008.11 

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    Event date: 2008.11

    Language:Others   Presentation type:Oral presentation (general)  

    Country:Thailand  

  • Overview of Porphyry-type Cu Mineralization in Namosi District (Waivaka and Waisoi), Viti Llevu, Republic of the Fiji Islands International conference

    A. Imai, T. Tanaka, S. Egashira, Y. Ohbuchi, K. Masaki, K. Yasunaga, K. Maeda

    2008.10 

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    Event date: 2008.10

    Language:Others   Presentation type:Oral presentation (general)  

    Country:Philippines  

  • Sedimantary Provenance and Tectonic Setting of Northwestern Panay Clastic Rocks Deduced from Major and Trace Element Geochemistry International conference

    J. A. S. Gabo, C. B. Dimalanta, K. L. Queano, G. P. Yumul, Jr., E. J. Marquez, l. R. Zamoras, L. T. Armada, M. G. S. Asia, A. Imai

    Rediscovering the Philippine Setting: Meteorology, Mineralization and Tectonics Symposium  2008.10 

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    Event date: 2008.10

    Language:Others  

    Country:Philippines  

  • Enrichment of Rare Earth Elements in Weathered Crust of Tin-bearing Granitic Rocks, Southern Thailand International conference

    A. Imai, K. sanematsu, S. Ishida, K. Watanabe, J. Boosayasak

    Rediscovering the Philippine Setting: Meteorology, Mineralization and Tectonics Symposium  2008.10 

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    Event date: 2008.10

    Language:Others   Presentation type:Oral presentation (general)  

    Country:Philippines  

  • Metallogenesis of Hydrothermal deposits in Kamchatka based on Formation Age and Sulfur Isotopic Composition International conference

    R. Takahashi, K. Watanabe, A. Imai, V. M. Okurugin, H. Matsueda, S. Ono

    Rediscovering the Philippine Setting: Meteorology, Mineralization and Tectonics Symposium  2008.10 

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    Event date: 2008.10

    Language:Others   Presentation type:Oral presentation (general)  

    Country:Philippines  

  • タイ南部の含錫花崗岩類の風化殻の希土類元素

    今井 亮, 実松健造, 渡邊公一郎, 石田晋吾

    日本鉱物科学会・資源地質学会 三鉱シンポジウム  2008.9 

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    Event date: 2008.9

    Language:Others   Presentation type:Oral presentation (general)  

    Country:Japan  

  • 浅熱水性金鉱床における石英のカソード・ルミネッセンスと微量成分の測定

    高橋亮平, A.Muller, Alfons van den Kerkhof, A. Kronz, 松枝大治, 小野修司, Victor M. Okurugin, 渡邊公一郎, 今井 亮

    資源地質学会第58回年会学術講演会  2008.6 

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    Event date: 2008.6

    Language:Others   Presentation type:Oral presentation (general)  

    Country:Japan  

  • Intrusive Rocks and Porphyry Copper Deposit at Yandera District, Papua New Guinea

    Y. Juyanagi, A. Imai

    2008.6 

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    Event date: 2008.6

    Language:Others   Presentation type:Oral presentation (general)  

    Country:Japan  

  • Sulfur Isotope Study on Porphyry Copper Deposit at the Waivaka Corridor Area, Namosi District, Viti Levu, Republic of Fiji Islands

    S. Egashira, T. Tanaka, K. Masaki, A. Imai, K. Yasunaga, K. Maeda

    2008.6 

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    Event date: 2008.6

    Language:Others   Presentation type:Oral presentation (general)  

    Country:Japan  

  • タイ南部の含錫花崗岩の希土類元素の風化殻における濃集

    今井 亮, 実松健造, 渡邊公一郎, 石田晋吾

    日本地球惑星科学連合2008年大会  2008.5 

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    Event date: 2008.5

    Language:Others   Presentation type:Oral presentation (general)  

    Country:Japan  

  • Enrichment of Rare Earth Element Associated with Granitic Rocks, Southern Thailand International conference

    Akira Imai, Kenzo Sanematsu, Shingo Ishida, Koichiro Watanabe, Jarupong Boosayasak

    The 2nd International Workshop and Conference on Earth Resources Technology  2008.4 

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    Event date: 2008.4

    Language:Others   Presentation type:Oral presentation (general)  

    Country:Thailand  

  • Interaction Between Gold(I) Complexes and the Surface of Metal Sulfides (FeS2 and Ag2S) International conference

    Kotaro Yonezu, Tomoaki Shibao, Takushi Yokoyama, Akira Imai, Koichiro Watanabe

    The 2nd International Workshop and Conference on Earth Resources Technology  2008.4 

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    Event date: 2008.4

    Language:Others   Presentation type:Oral presentation (general)  

    Country:Thailand  

  • Study on Porphyry-type Copper Mineralization at the Waivaka Corridor Area, Namosi District, Viti Levu, Republic of the Fiji Islands International conference

    Saori Egashira, Akira Imai, Takayuki Tanaka, Kentaro Masaki, Kentaro Yasunaga, Katsuhiko Maeda

    The 2nd International Workshop and Conference on Earth Resources Technology  2008.4 

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    Event date: 2008.4

    Language:Others   Presentation type:Oral presentation (general)  

    Country:Thailand  

  • Petrography and Petrochemical Characteristics of the Intrusive Rocks Related to Porphyry Copper Mineralization in Namosi District, Viti Levu, Republic of the Fiji Islands International conference

    Takayuki Tanaka, Akira Imai, Saori Egashira, Sachihiro Sakomoto, Kentaro Yasunaga

    The 2nd International Workshop and Conference on Earth Resources Technology  2008.4 

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    Event date: 2008.4

    Language:Others   Presentation type:Oral presentation (general)  

    Country:Thailand  

  • Uptake of boron and gold by calcium silicate hydrate (CSH): application for effective utilization of geothermal energy at geothermal power plant and the recovery of rare metals from geothermal water International conference

    Sakomoto Sachihiro, Yonezu Kotaro, Okaue Yoshihiro, Yokoyama Takushi, Imai Akira, Watanabe Koichiro

    5th International Symposium on Earth Science and Technology  2007.12 

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    Event date: 2007.12

    Language:Others   Presentation type:Oral presentation (general)  

    Country:Japan  

  • Fluid inclusion study and opaque mineral asemblage in quartz veins at deep and shallow part of the Batu Hiaju porphyry Cu0Au deposit, Sumbawa, Indonesia International conference

    Nagai Yuki, Imai Akira

    5th International Symposium on Earth Science and Technology  2007.12 

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    Event date: 2007.12

    Language:Others   Presentation type:Oral presentation (general)  

    Country:Japan  

  • Characteristics of the Seisen veins, Hishikari gold deposits, Japan International conference

    Tohma Yuki, Imai Akira, Egashira Saori, Watanabe Koichiro, Sanematsu Kenzo

    5th International Symposium on Earth Science and Technology  2007.12 

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    Event date: 2007.12

    Language:Others   Presentation type:Oral presentation (general)  

    Country:Japan  

  • Petrography and chemical composition on the intrusive rocks related to porphyry-type copper mineralization in Namosi district, Viti Levu, Republic of the Fiji Islands International conference

    Tanaka Takayuki, Imai Akira, Egashira Saori, Sakomoto Sachihiro

    5th International Symposium on Earth Science and Technology  2007.12 

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    Event date: 2007.12

    Language:Others   Presentation type:Oral presentation (general)  

    Country:Japan  

  • Migration of subduction in central Java, Indonesia International conference

    Uruma Ryusuke, Kohno Yasuaki, Watanabe Koichiro, Imai Akira, Itaya Tetsumaru, Setijadji Lucas DOnny, Harijoko Agung

    5th International Symposium on Earth Science and Technology  2007.12 

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    Event date: 2007.12

    Language:Others   Presentation type:Oral presentation (general)  

    Country:Japan  

  • Copprecipitation of Au(I) complex anions by aluminum hydroxide International conference

    Yonezu Kotaro, Okaue Yoshihiro, Yokoyama Takushi, Imai Akira, Watanabe Koichiro

    5th International Symposium on Earth Science and Technology  2007.12 

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    Event date: 2007.12

    Language:Others   Presentation type:Oral presentation (general)  

    Country:Japan  

  • Characteristics of intrusive rocks associated with copper mineralization at the Waivaka Corridor area, Namosi district, Viti Levu, Republic of the Fiji Islands International conference

    Egashira Saori, Tanaka Takayuki, Masaki Kentaro, Imai Akira, Yasunaga Kentaro, Maeda Katsuhiko

    5th International Symposium on Earth Science and Technology  2007.12 

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    Event date: 2007.12

    Language:Others   Presentation type:Oral presentation (general)  

    Country:Japan  

  • Porphyry-type copper mineralization at the Waivaka Corridor area, Namosi district, Fiji International conference

    Egashira Saori, Masaki Kentaro, Imai Akira, Tanaka Takayuki, Yasunaga Kentaro, Maeda Katsuhiko

    International Association for Gondwana Research Conference  2007.11 

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    Event date: 2007.11

    Language:Others   Presentation type:Oral presentation (general)  

    Country:Japan  

  • Migration of subduction degrees in Central Java, Indonesia International conference

    Uruma Ryusuke, Kohno Yasuaki, Watanabe Koichiro, Imai Akira, Itaya Tetsumaru, Setijadji Lucas Donny, Harijoko Agung

    International Association for Gondwana Research Conference  2007.11 

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    Event date: 2007.11

    Language:Others   Presentation type:Oral presentation (general)  

    Country:Japan  

  • The Seisen veins Hishikari epithermal gold deposits, Japan: microscopic observation and fluid inclusions International conference

    Tohma Yuki, Watanabe Koichiro, Imai Akira, Sanematsu Kenzo

    International Association for Gondwana Research Conference  2007.11 

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    Event date: 2007.11

    Language:Others   Presentation type:Oral presentation (general)  

    Country:Japan  

  • Petrological study on the intrusive rocks related to porphyry-type copper mineralization in Namosi district, Viti Levu, Republic of the Fiji Islands International conference

    Tanaka Takayuki, Egashira Saori, Sakomoto Sachihiro, Imai Akira, Yasunaga Kentaro, Maeda Katsuhiko

    International Association for Gondwana Research Conference  2007.11 

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    Event date: 2007.11

    Language:Others   Presentation type:Oral presentation (general)  

    Country:Japan  

  • Island arc growth, metallogeny, and volcanic hazard risks of western Sunda arc, clarifying the significance of Gondwana crust International conference

    Setijadji Lucas Donny, Watanabe Koichiro, Imai Akira, Wibowo Haryo Edi, Barianto Didit Hadi, Itata Tetsumaru

    International Association for Gondwana Research Conference  2007.11 

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    Event date: 2007.11

    Language:Others   Presentation type:Oral presentation (general)  

    Country:Japan  

  • Deposition model of copper sulfides and ore genesis of the Batu Hijau porphyry Cu-Au deposit, Sumbawa, Indonesia International conference

    Nagai Yuki, Imai Akira

    International Association for Gondwana Research Conference  2007.11 

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    Event date: 2007.11

    Language:Others   Presentation type:Oral presentation (general)  

    Country:Japan  

  • Study on hydrothermal alteration in Kasihan area, Indonesia International conference

    Fukuda Kazuchika, Imai Akira, I Wayan Warmada, Titisari Dewi Anastasia, Idrus Arifudin, Tun Myo Min, Furqon Reza Al, Saldil Nurarfi

    International Association for Gondwana Research Conference  2007.11 

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    Event date: 2007.11

    Language:Others   Presentation type:Oral presentation (general)  

    Country:Japan  

  • Geology of metallic deposits in Java island (Indonesia) with a special reference to the island arc magmatism International conference

    Setijadji Lucas Donny, Imai Akira, Itaya Tetsumaru, Watanabe Koichiro

    International Workshop on Earth Resources Technology  2007.4 

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    Event date: 2007.4

    Language:Others   Presentation type:Oral presentation (general)  

    Country:Japan  

  • Characteristics of the mineralization at the Wainaoulo-Southeast area, Namosi district, Viti Levu, Republic of the Fiji Islands International conference

    Egashira Saori, Imai Akira, Tanaka Takayuki, Sasunaga Kentaro, Maeda Katsuhiko

    International Workshop on Earth Resources Technology  2007.4 

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    Event date: 2007.4

    Language:Others   Presentation type:Oral presentation (general)  

    Country:Japan  

  • Adsorption behavior of gold(I)-thiosulfate complex anions onto the surface of manganese dioxide: approach the recovery of gold from geothermal waters International conference

    Sakomoto Sachihiro, Yonezu Kotaro, Yokoyama Takushi, Okaue Yoshihiro, Imai Akira, Watanabe Koichiro

    International Workshop on Earth Resources Technology  2007.4 

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    Event date: 2007.4

    Language:Others   Presentation type:Oral presentation (general)  

    Country:Japan  

  • Diorites and their roles in the mineralization of southeastern Mindanao, Philippines International conference

    Suerte Leilanie Osano, Nishihara Sho, Imai Akira, Watanabe Koichiro

    International Workshop on Earth Resources Technology  2007.4 

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    Event date: 2007.4

    Language:Others   Presentation type:Oral presentation (general)  

    Country:Japan  

  • Study on the determination of trace elements in siliceous deposit formed from hydrothermal water by ICP-MS International conference

    Yonezu Kotaro, Yokoyama Takushi, Moromuro Yoshinobu, Imai Akira, Watanabe Koichiro

    International Workshop on Earth Resources Technology  2007.4 

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    Event date: 2007.4

    Language:Others   Presentation type:Oral presentation (general)  

    Country:Japan  

  • Variation of chemical composition of microphenocrystic apatite in intermediate to silicic igneous rocks in the western Pacific island arcs and the implication to metallogenesis of porphyry copper deposits. Invited International conference

    Akira Imai

    HUTTON V  2003.8 

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    Language:Others   Presentation type:Oral presentation (general)  

    Country:Japan  

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MISC

  • UP-13 御嶽山2014年9月水蒸気噴火火山灰の物質科学的特徴(緊急学術セッション(ポスター))

    井村 匠, 南 裕介, 高橋 亮平, 今井 亮, 大場 司, 林 信太郎

    日本火山学会講演予稿集   2014.11

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    Language:Japanese  

  • Silicic acid removal as magnesium silicate and uptake of boron from synthetic geothermal water for the effective utilization of geothermal energy

    Yohei Kawabata, Kotaro Yonezu, Koichiro Watanabe, Akira Imai, Takushi Yokoyama

    GEOCHIMICA ET COSMOCHIMICA ACTA   2010.6

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    Language:English  

  • アジア地域の地球科学,資源,環境に関する国際学術討論会(GREAT2008)とそこで得られたインドシナ地域の資源情報

    石原舜三, 今井 亮

    資源地質   2009.5

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    Language:Japanese  

  • Miocene granites and the Hishikari gold deposits in Kyushu.

    Yamamoto, M., Kawano, Y., Imai, A. and Nishimura, K.

    2003.8

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    Language:English  

  • Porphyry copper and gold mineralization in the Philippines.

    Imai, A., Muyco, J. D., Domingo, E. G., Almeda, R. L., Villones, R. I., Jr., Yumul, G. P., Jr., Damasco, F. V., Baluda, R. P., Malihan, T. D., Datuin, R. T., Punongbayan, R. S., Listanco, E. L. and Santos, R. A.

    1992.8

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    Language:English  

  • Epithermal gold and kuroko mineralizations in northeast Honshu.

    Shikazono, N., Aoki, M., Yamada, R., Kouda, R., Singer, D. A. and Imai, A.

    1992.8

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    Language:English  

  • Philippinesの金属鉱床とメタロジェニー

    今井 亮

    1992.3

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    Language:Japanese  

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Professional Memberships

  • 資源地質学会

  • 日本火山学会

  • Society of Economic Geologists

  • Spciety for Geology Applied to Mineral Deposits

  • International Association on Genesis of Ore Deposits

  • Geological Society of the Philippines

  • Geological Society of the Philippines

  • International Association of Genesis of Ore Deposits

  • Society of Geology Applied to Mineral Deposits

  • Society of Resource Geology

  • アメリカ鉱床学会 The Society of Economic Geologists

  • フィリピン地質学会 The Geological Society of the Philippines

  • 国際鉱床学連合 International Association on Genesis of Ore Deposits

  • 鉱床応用地質学会 Society for Geology Applied to Mineral Deposits

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Committee Memberships

  • Councilor   Domestic

    2023.4 - 2024.4   

  • Member of Editorial Board   Foreign country

    2023.4 - 2024.4   

  • 資源地質学会   学会賞審査委員長、編集委員   Domestic

    2023.4 - 2024.4   

  • 資源地質学会   学会賞審査委員長   Domestic

    2023.4 - 2024.4   

  • Councilor   Domestic

    2022.4 - 2025.4   

  • 資源地質学会   学会賞審査委員長   Foreign country

    2020.6 - 2021.6   

  • 資源地質学会   学会賞審査委員長、編集委員   Foreign country

    2020.4 - 2021.4   

  • Vice-chairman   Foreign country

    2017.6 - 2020.6   

  • Councilor   Domestic

    2008.3 - 2020.3   

  • 常務委員長   常務委員長   Domestic

    2008.3 - 2010.3   

  • Councilor   Domestic

    2004.3 - 2007.3   

  • Councilor   Domestic

    2000.3 - 2003.3   

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Academic Activities

  • Resource Geology International contribution

    2023.4 - 2024.4

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    Type:Academic society, research group, etc. 

  • Screening of academic papers

    Role(s): Peer review

    2020

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    Type:Peer review 

    Number of peer-reviewed articles in foreign language journals:5

    Number of peer-reviewed articles in Japanese journals:0

    Proceedings of International Conference Number of peer-reviewed papers:15

    Proceedings of domestic conference Number of peer-reviewed papers:0

  • Screening of academic papers

    Role(s): Peer review

    2019

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    Type:Peer review 

    Number of peer-reviewed articles in foreign language journals:5

    Number of peer-reviewed articles in Japanese journals:0

    Proceedings of International Conference Number of peer-reviewed papers:7

    Proceedings of domestic conference Number of peer-reviewed papers:0

  • Resource Geology International contribution

    2010.7 - 2024.6

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    Type:Academic society, research group, etc. 

  • Other International contribution

    Earth Science International Conference  ( Manila Philippines Philippines ) 2009.8

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    Type:Competition, symposium, etc. 

  • Other International contribution

    InterDiscipilinary Conference  ( Yogyakarta Indonesia Indonesia Indonesia ) 2009.8

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    Type:Competition, symposium, etc. 

    Number of participants:250

  • Other International contribution

    Regional Conference on Earth Science  ( Philippines Philippines ) 2009.8

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    Type:Competition, symposium, etc. 

  • その他 International contribution

    資源地質学会 シンポジウム  2009.6

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    Type:Competition, symposium, etc. 

  • その他

    地球惑星科学連合  2009.5

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    Type:Competition, symposium, etc. 

  • Other International contribution

    2nd International Workshop and Conference on Earth Resources Technology  ( Bangkok Thailand Thailand ) 2008.4

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    Type:Competition, symposium, etc. 

    Number of participants:100

  • Other International contribution

    5th International Sumposium on Earth Science and Technology  ( Japan Japan ) 2007.12

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    Type:Competition, symposium, etc. 

  • Other International contribution

    Fieldwise Seminar and International Symposium  ( Indonesia Indonesia ) 2007.12

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    Type:Competition, symposium, etc. 

  • Other International contribution

    International Workshop on earth Resource Technology  ( Japan Japan ) 2007.4

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    Type:Competition, symposium, etc. 

  • その他 International contribution

    ( 九大 Japan ) 2007.4

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    Type:Competition, symposium, etc. 

    Number of participants:100

  • その他 International contribution

    ( ジョグジャカルタ Indonesia ) 2006.8 - Present

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    Type:Competition, symposium, etc. 

  • その他 International contribution

    ( 神戸 Japan ) 2006.7 - Present

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    Type:Competition, symposium, etc. 

  • その他 International contribution

    ( 神戸 Japan ) 2006.7 - Present

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    Type:Competition, symposium, etc. 

    Number of participants:900

  • その他 International contribution

    ( 神戸 Japan ) 2006.7 - Present

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    Type:Competition, symposium, etc. 

  • 座長(Chairmanship) International contribution

    ( 神戸 ) 2006.7 - Present

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    Type:Competition, symposium, etc. 

  • 資源地質

    2006.4 - 2010.3

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    Type:Academic society, research group, etc. 

  • Resource Geology International contribution

    2006.4 - 2010.3

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    Type:Academic society, research group, etc. 

  • その他 International contribution

    ( バンコク Thailand ) 2005.12 - Present

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    Type:Competition, symposium, etc. 

  • その他 International contribution

    ( 北京 China ) 2005.8 - Present

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    Type:Competition, symposium, etc. 

  • その他 International contribution

    ( マニラ Philippines ) 2005.6 - Present

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    Type:Competition, symposium, etc. 

    Number of participants:200

  • その他 International contribution

    ( ジョグジャカルタ Indonesia ) 2004.12 - Present

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    Type:Competition, symposium, etc. 

  • その他 International contribution

    ( タガイタイ Philippines ) 2004.8 - Present

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    Type:Competition, symposium, etc. 

  • その他

    資源地質学会  ( 東京大学 Japan ) 2004.6 - Present

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    Type:Competition, symposium, etc. 

  • その他 International contribution

    ( 豊橋大学 Japan ) 2003.8 - Present

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    Type:Competition, symposium, etc. 

  • その他 International contribution

    ( 愛知大学 Japan ) 2003.8 - Present

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    Type:Competition, symposium, etc. 

    Number of participants:250

  • その他 International contribution

    ( 豊橋 Japan ) 2003.7 - Present

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    Type:Competition, symposium, etc. 

  • その他

    資源地質学会  ( 東京大学 Japan ) 2003.6 - Present

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    Type:Competition, symposium, etc. 

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Other

  • フィリピン地質学会から、同会創立以来初めての、外国人の名誉会員に選出された。

    2020.1

  • 自然史博物館(イギリス)の研究者が代表者となっている研究プロジェクト「From Arc Magmas to Ores」にアジアから唯一、国際連携研究者として参加している。その中の研究業績として共著論文が掲載された。

    2018.6

Research Projects

  • Cipango Resources Japan

    2023

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    Grant type:Donation

  • 資源分野の人材育成プログラム(資源の絆)委託講座

    2022.4 - 2027.3

    受託研究

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    Authorship:Principal investigator  Grant type:Other funds from industry-academia collaboration

  • 浅熱水金鉱床の金鉱化下限評価

    2022.4 - 2024.3

    共同研究

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    Authorship:Principal investigator  Grant type:Other funds from industry-academia collaboration

  • 奨学寄付金

    2022

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    Grant type:Donation

  • 奨学寄付金

    2022

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    Grant type:Donation

  • 資源の絆年九州大学大学院工学府特別プログラム

    2021.6 - 2024.5

    受託研究

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    Authorship:Principal investigator  Grant type:Other funds from industry-academia collaboration

  • 菱刈鉱山の同一深度における鉱体の地球化学敵特性と富鉱体の関係及び探鉱への応用

    2021.6 - 2024.3

    共同研究

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    Authorship:Coinvestigator(s)  Grant type:Other funds from industry-academia collaboration

  • 熱水鉱床の成因の指標と資源探査の指針となる流体包有物研究

    Grant number:21KK0089  2021 - 2024

    日本学術振興会  科学研究費助成事業  国際共同研究強化(B)

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    Authorship:Coinvestigator(s)  Grant type:Scientific research funding

  • 熱水鉱床の流体包有物の近赤外顕微鏡観察とガス組成分析による探鉱への応用

    Grant number:21K04960  2021 - 2023

    日本学術振興会  科学研究費助成事業  基盤研究(B)

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    Authorship:Coinvestigator(s)  Grant type:Scientific research funding

  • 奨学寄付金

    2021

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    Grant type:Donation

  • アフリカ東部東部および南部の造山型金鉱化作用 International coauthorship

    2018.4 - 2033.6

    ボツワナ国際科学技術大学、ボツワナ大学、エドゥアルドモンドラーネ大学、テテ工科大学、タンザニア地質調査所、ドドマ大学、ダルエスサラーム大学 

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    Authorship:Principal investigator 

  • アフリカ東部、南部のカーボナタイト岩体、アルカリ岩貫入岩体に伴われる希土類元素鉱床 International coauthorship

    2018.4 - 2033.6

    マラウイ地質調査所、タンザニア地質調査所、ボツワナ国際科学技術大学、ボツワナ大学 

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    Authorship:Principal investigator 

  • From Arc Magmas to Ores International coauthorship

    2017.7 - 2023.3

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    Authorship:Collaborating Investigator(s) (not designated on Grant-in-Aid) 

  • 古火成弧において生成した斑岩銅鉱床および浅熱水鉱床メタロジェニー International coauthorship

    2010.7 - 2033.12

      More details

    Authorship:Principal investigator 

    現在の火成弧ではない中央アジア、インドシナ半島において、過去の火成弧で生成した斑岩銅鉱床および浅熱水鉱床が分布している。それらの斑岩銅鉱床および浅熱水鉱床の生成場を解明、復元して、生成環境を明らかにするとともに、探査指針を得ることを目指す。

  • 東南アジアと西太平洋島弧における白金族元素と希土類元素の資源ポテンシャル

    2009 - 2012

    日本学術振興会  科学研究費助成事業  基盤研究(B)

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    Authorship:Principal investigator  Grant type:Scientific research funding

  • 東南アジア含錫花崗岩風化殻における希土類元素の濃集機構の解明 International coauthorship

    2007.7 - 2033.12

    九州大学(日本) 

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    Authorship:Principal investigator 

  • 重希土類元素およびインジウムの濃集機構と資源ポテンシャル評価の研究

    2007 - 2010

    科学研究費助成事業  国際学術研究

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    Authorship:Coinvestigator(s)  Grant type:Scientific research funding

  • 東南アジアにおける地球資源ポテンシャル評価と統合解析システムの構築

    2006 - 2009

    日本学術振興会  科学研究費助成事業  基盤研究(B)

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    Authorship:Coinvestigator(s)  Grant type:Scientific research funding

  • アフリカ・ザンビアにおける資源生産と環境保全に関する技術動向調査

    2006

    日本学術振興会  科学研究費助成事業  基盤研究(C)

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    Authorship:Coinvestigator(s)  Grant type:Scientific research funding

  • 地球化学的手法による地圏環境の研究

    2005.6

    共同研究

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    Authorship:Coinvestigator(s)  Grant type:Other funds from industry-academia collaboration

  • メラピ−ウンガラン火山システムの地熱系発達史解明と地熱資源量評価に関する研究

    2005 - 2008

    日本学術振興会  科学研究費助成事業  基盤研究(B)

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    Authorship:Coinvestigator(s)  Grant type:Scientific research funding

  • 極東地域の島弧の地質環境における熱水活動とそれに伴う金属鉱床の形成過程

    2005 - 2007

    日本学術振興会  科学研究費助成事業  基盤研究(B)

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    Authorship:Coinvestigator(s)  Grant type:Scientific research funding

  • 流体包有物の海洋性島弧における斑岩銅鉱床探査への応用

    2005

    日本鉱業振興会

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    Authorship:Principal investigator  Grant type:Contract research

  • 安山岩アルカリ骨材反応の岩石学的アプローチによる研究

    2004 - 2005

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    Authorship:Principal investigator  Grant type:Contract research

  • 流体包有物の海洋性島弧における斑岩銅鉱床探査への応用

    2004

    日本鉱業振興会

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    Authorship:Principal investigator  Grant type:Contract research

  • 流体包有物の海洋性島弧における斑岩銅鉱床探査への応用

    2003 - 2005

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    Authorship:Principal investigator  Grant type:Contract research

  • 流体包有物の研究の海洋性島弧における斑岩銅鉱床探査への応用 International coauthorship

    2001.4 - 2033.12

    九州大学 

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    Authorship:Principal investigator 

    流体包有物の研究を斑岩銅鉱床の探査プロジェクトへ応用し,有望地域の選定に寄与する.

  • 海洋性島弧における斑岩銅鉱床,浅熱水金鉱床メタロジェニー International coauthorship

    2001.4 - 2033.12

    九州大学 

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    Authorship:Principal investigator 

    海洋性島弧であるインドネシア、フィジーおよびフィリピンにおける斑岩銅鉱床および浅熱水金鉱床のメタロジェニーを解明し,将来開発可能な資源ポテンシャルを把握する.

  • 朱の産地推定による古代国家成立過程の解明

    2001.4 - 2015.12

    橿原考古学研究所 

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    Authorship:Coinvestigator(s) 

    遺跡に埋葬された朱の産地を推定にすることにより古代国家の成立過程を解明する.

▼display all

Class subject

  • 地球システム学概論

    2023.12 - 2024.2   Winter quarter

  • 地球システム学概論

    2023.12 - 2024.2   Winter quarter

  • Practical Environmental Engineering

    2023.10 - 2024.3   Second semester

  • Japanese Studies

    2023.10 - 2024.3   Second semester

  • 資源地質学第一

    2023.10 - 2023.12   Fall quarter

  • 鉱床学

    2023.10 - 2023.12   Fall quarter

  • 地球資源システム工学A

    2023.6 - 2023.8   Summer quarter

  • 鉱物工学

    2023.4 - 2024.3   Full year

  • 資源地球科学

    2023.4 - 2023.6   Spring quarter

  • 資源地球科学

    2023.4 - 2023.6   Spring quarter

  • 地球システム学概論

    2022.12 - 2023.2   Winter quarter

  • 地球システム学概論

    2022.12 - 2023.2   Winter quarter

  • 資源地質学第一

    2022.10 - 2022.12   Fall quarter

  • 鉱床学

    2022.10 - 2022.12   Fall quarter

  • 地球資源システム工学A

    2022.6 - 2022.8   Summer quarter

  • 地球資源システム工学A

    2022.6 - 2022.8   Summer quarter

  • 鉱物工学

    2022.4 - 2023.3   Full year

  • 鉱物工学

    2022.4 - 2023.3   Full year

  • 資源地球科学

    2022.4 - 2022.6   Spring quarter

  • 資源地球科学

    2022.4 - 2022.6   Spring quarter

  • 資源地球科学

    2022.4 - 2022.6   Spring quarter

  • 資源地球科学

    2022.4 - 2022.6   Spring quarter

  • 地球システム学概論

    2021.12 - 2022.2   Winter quarter

  • 地球システム学概論

    2021.12 - 2022.2   Winter quarter

  • 鉱床学

    2021.10 - 2021.12   Fall quarter

  • 地球資源システム工学A

    2021.10 - 2021.12   Fall quarter

  • 資源地質学第一

    2021.10 - 2021.12   Fall quarter

  • 鉱床学

    2021.10 - 2021.12   Fall quarter

  • 地球資源システム工学A

    2021.10 - 2021.12   Fall quarter

  • 資源地質学第一

    2021.10 - 2021.12   Fall quarter

  • 鉱物工学

    2021.4 - 2022.3   Full year

  • 鉱物工学

    2021.4 - 2022.3   Full year

  • 資源地球科学

    2021.4 - 2021.6   Spring quarter

  • 資源地球科学

    2021.4 - 2021.6   Spring quarter

  • 地球システム学概論

    2020.12 - 2021.2   Winter quarter

  • 資源地質学第一

    2020.10 - 2020.12   Fall quarter

  • 鉱床学

    2020.10 - 2020.12   Fall quarter

  • 資源地球科学

    2020.4 - 2020.6   Spring quarter

  • 地球システム学概論

    2019.12 - 2020.2   Winter quarter

  • 鉱床学

    2019.10 - 2019.12   Fall quarter

  • 資源地質学第一

    2019.10 - 2019.12   Fall quarter

  • 鉱床学

    2019.10 - 2019.12   Fall quarter

  • 資源地質学第一

    2019.10 - 2019.12   Fall quarter

  • 鉱床学

    2019.4 - 2019.9   First semester

  • 資源地球科学

    2019.4 - 2019.6   Spring quarter

  • 地球システム学概論

    2018.12 - 2019.2   Winter quarter

  • 鉱床学

    2018.10 - 2018.12   Fall quarter

  • 資源地質学第一

    2018.10 - 2018.12   Fall quarter

  • 資源地球科学

    2018.4 - 2018.9   First semester

  • 地球システム学概論

    2017.10 - 2018.3   Second semester

  • 地球システム学概論

    2017.10 - 2018.3   Second semester

  • 鉱床学

    2017.10 - 2017.12   Fall quarter

  • 資源地質学第一

    2017.10 - 2017.12   Fall quarter

  • 資源地質学第一

    2017.4 - 2017.9   First semester

  • 地球システム学概論

    2017.4 - 2017.9   First semester

  • 鉱床学第2/資源地球科学

    2009.10 - 2010.3   Second semester

  • 資源地質学第二

    2009.10 - 2010.3   Second semester

  • 地質実習/地球システム工学実習

    2009.4 - 2010.3   Full year

  • 産学連携研究

    2009.4 - 2010.3   Full year

  • 鉱物工学実験第二

    2009.4 - 2010.3   Full year

  • 鉱物工学実験第一

    2009.4 - 2010.3   Full year

  • 産学連携研究

    2009.4 - 2010.3   Full year

  • 地球資源インターンシップ実習

    2009.4 - 2010.3   Full year

  • 熱と波動論基礎

    2009.4 - 2009.9   First semester

  • 産学連携研究

    2009.4 - 2009.9   First semester

  • CL4

    2009.4 - 2009.9   First semester

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FD Participation

  • 2009.1   Role:Planning   Title:国際教育プログラムについて

    Organizer:Undergraduate school department

  • 2008.7   Role:Participation   Title:グローバル時代の大学について

    Organizer:University-wide

  • 2007.4   Role:Moderator   Title:地球資源システム工学部門FD

    Organizer:Undergraduate school department

  • 2007.3   Role:Participation   Title:GPA

    Organizer:University-wide

  • 2003.4   Role:Participation   Title:不明

    Organizer:University-wide

Visiting, concurrent, or part-time lecturers at other universities, institutions, etc.

  • 2024  秋田大学  Classification:Affiliate faculty  Domestic/International Classification:Japan 

  • 2023  秋田大学  Classification:Affiliate faculty 

  • 2023  富山大学  Classification:Part-time lecturer 

  • 2022  秋田大学  Classification:Affiliate faculty 

  • 2022  富山大学  Classification:Part-time lecturer 

  • 2021  秋田大学  Classification:Affiliate faculty  Domestic/International Classification:Japan 

  • 2020  秋田大学  Domestic/International Classification:Japan 

  • 2019  秋田大学  Domestic/International Classification:Japan 

  • 2018  秋田大学  Domestic/International Classification:Japan 

  • 2017  秋田大学  Classification:Part-time lecturer  Domestic/International Classification:Japan 

    Semester, Day Time or Duration:後期

  • 2008  国際資源大学校  Classification:Intensive course  Domestic/International Classification:Japan 

  • 2007  国立大学共同利用邦人 環境学研究所  Classification:Affiliate faculty  Domestic/International Classification:Japan 

  • 2007  産業技術総合研究所  Classification:Affiliate faculty  Domestic/International Classification:Japan 

  • 2003  鹿児島大学理工学研究科  Classification:Intensive course  Domestic/International Classification:Japan 

▼display all

Participation in international educational events, etc.

  • 2023.4

    秋田大学・九州大学

    スマートマイニングプログラム運営委員

  • 2022.10

    秋田大学 九州大学

    世界展開力事業 スマートマイニング特別プログラム (運営委員)

  • 2009.8

    ASEAN UNIVERSITY NETWORK

    Fieldwise Seminar Regional Conference

      More details

    Venue:Manila, Philippines

    Number of participants:150

  • 2009.8

    Asean University Network

    Inter disciplinary Seminar

      More details

    Venue:Yogyakarta, Indonesia

    Number of participants:250

  • 2008.7

    アセアン大学ネットワーク(AUN)

    AUN-SEEDNet Regional Conference

      More details

    Venue:タイ、チェンマイ

    Number of participants:150

  • 2007.11

    アセアン大学ネットワーク

    AUN SEEDNet Fieldwise Seminar

      More details

    Venue:ベトナム、ホーチミン市

    Number of participants:150

  • 2006.8

    JICA

    AUN/SEED-Net Fieldwise Siminar

      More details

    Venue:インドネシア

  • 2005.12

    JICA

    AUN/SEED-Net Fieldwise Siminar

      More details

    Venue:タイ

  • 2004.12

    JICA

    AUN/SEED-Net Fieldwise Siminar

      More details

    Venue:インドネシア

  • 2004.8

    JICA

    AUN/Seed-Net Fieldwise Seminar

      More details

    Venue:フィリピン

  • 2004.1

    JICA

    AUN/Seed-Net Fieldwise Seminar

      More details

    Venue:マレーシア

▼display all

Other educational activity and Special note

  • 2023  Special Affairs 

  • 2023  Special Affairs 

  • 2022  Special Affairs 

  • 2022  Special Affairs 

  • 2021  Special Affairs 

  • 2021  Special Affairs 

  • 2020  Special Affairs 

  • 2009  Class Teacher 

  • 2003  Special Affairs 

  • 2003  Special Affairs 

▼display all

Outline of Social Contribution and International Cooperation activities

  • Lecturer on Special Training Course of the Society of Resource Geology (1991, 1995)

Social Activities

  • 九州大学工学研究院附属環境工学教育研究センター開催の公開講座において講演を行なった

    九州大学工学研究院附属環境工学教育研究センター  九州大学工学研究院附属環境工学教育研究センター  2023.9

     More details

    Audience: General, Scientific, Company, Civic organization, Governmental agency

    Type:Lecture

  • 九州大学と北海道大学の共同資源工学専攻と関連分野の企業や政府機関などとのコンソーシアムにより資源人材の育成に連携して取り組む。

    資源系教育コンソーシアム  札幌、東京、福岡  2023.4

     More details

    Audience: General, Scientific, Company, Civic organization, Governmental agency

    Type:Other

  • 住友金属鉱山菱刈鉱山との産学連携の一環としての技術指導

    住友金属鉱山菱刈鉱山  住友金属鉱山菱刈鉱山  2023.4

     More details

    Audience: General, Scientific, Company, Civic organization, Governmental agency

    Type:Research consultation

    住友金属鉱山株式会社と本額の間に組織対応型連携の一部として、世界的な高品位金鉱山である菱刈鉱床の高品位部の深度の加減を評価する手法に取り組んでいる。成果がまとまり、2024年度の全国鉱山現場担当者会議にて発表される予定となった。

  • 福岡県環境瀬専門委員としてアドバイスをおこなった

    福岡県  福岡県  2023.4

     More details

    Audience: General, Scientific, Company, Civic organization, Governmental agency

    Type:Other

  • 不明

    資源系教育コンソーシアム  2022.4

     More details

    Audience: General, Scientific, Company, Civic organization, Governmental agency

    Type:Other

  • 工学研究院付属環境工学教育研究センター公開講座

    工学研究院付属環境工学教育研究センター  工学研究院付属環境工学教育研究センター  2022.3

     More details

    Audience: General, Scientific, Company, Civic organization, Governmental agency

    Type:Lecture

  • 国際資源大学校講師

    国際資源大学校  秋田県小坂町 国際資源大学校  2008.6

     More details

    Audience: General, Scientific, Company, Civic organization, Governmental agency

    Type:Research consultation

  • 講習会講師

    資源地質学会  つくば  1996.1

     More details

    Audience: General, Scientific, Company, Civic organization, Governmental agency

    Type:Research consultation

▼display all

Activities contributing to policy formation, academic promotion, etc.

  • 2019.7 - 2024.7   独立行政法人 石油天然ガス鉱物資源機構

    石油天然ガス鉱物資源機構の、海洋鉱物資源に関する資源量評価の部会長として、国の海洋基本計画に基づく海底鉱物資源の開発へ向けた技術開発に、専門家の立場から貢献する。

  • 2018.4 - 2020.4   資源地質学会

    資源地質学会の副会長として、専門分野である鉱床学、資源地質学の振興、発展のために活動した。

  • 2017.12 - 2024.3   石油天然学鉱物資源機構(JOGMEC)

    JOGMEC海底資源開発のためのワーキンググループ委員

  • 1995.7 - Present   金属鉱業事業団,石油天然ガス鉱物資源機構

    アドバイザー

Educational Activities for Highly-Specialized Professionals in Other Countries

  • 2022.4 - 2025.3   世界展開力事業 スマートマイニングプログラム

    Main countries of student/trainee affiliation:Japan

    Other countries of student/trainee affiliation:南アフリカ、ボツワナ、ザンビア、モザンビーク

  • 2008.3 - 2014.3   北東インドネシア産業人材育成事業(JICA)

    Main countries of student/trainee affiliation:Indonesia

  • 2003.4 - Present   ASEAN工学系高等教育ネットワーク支援事業 (JICA)

    Main countries of student/trainee affiliation:Indonesia

    Other countries of student/trainee affiliation:Myammer,Cambodia, Vietnum, Philippines

Acceptance of Foreign Researchers, etc.

  • タスマニア大学

    Acceptance period: 2019.5 - 2019.7   (Period):1 month or more

    Nationality:Australia

    Business entity:Japan Society for the Promotion of Science

  • Gajah Mada University

    Acceptance period: 2019.2 - 2019.11   (Period):1 month or more

    Nationality:Myanmar

    Business entity:Government agency

  • チュラロンコルン大学

    Acceptance period: 2010.5 - 2010.6   (Period):Less than 2 weeks

    Nationality:Thailand

    Business entity:Foreign governments, foreign research institutes, international organizations

  • マレーシア科学大学

    Acceptance period: 2009.11 - 2010.1   (Period):1 month or more

    Nationality:Malaysia

    Business entity:Foreign governments, foreign research institutes, international organizations

  • ガジャマダ大学

    Acceptance period: 2008.10 - 2009.1   (Period):1 month or more

    Nationality:Indonesia

    Business entity:Private/Foundation

  • ガジャマダ大学

    Acceptance period: 2007.2   (Period):Less than 2 weeks

    Nationality:Indonesia

    Business entity:Government agency

  • ガジャマダ大学

    Acceptance period: 2006.11   (Period):Less than 2 weeks

    Nationality:Indonesia

    Business entity:Government agency

  • ガジャマダ大学

    Acceptance period: 2006.2   (Period):Less than 2 weeks

    Nationality:Indonesia

    Business entity:Government agency

  • ガジャマダ大学

    Acceptance period: 2006.2   (Period):Less than 2 weeks

    Nationality:Indonesia

    Business entity:Government agency

  • ガジャマダ大学

    Acceptance period: 2005.3   (Period):Less than 2 weeks

    Nationality:Indonesia

    Business entity:Government agency

  • フィリピン大学

    Acceptance period: 2005.3   (Period):Less than 2 weeks

    Nationality:Philippines

    Business entity:Government agency

  • ガジャマダ大学

    Acceptance period: 2003.11 - 2003.12   (Period):2weeks to less than 1 month

    Nationality:Indonesia

    Business entity:Government agency

▼display all

Travel Abroad

  • 2024.3

    Staying countory name 1:Botswana   Staying institution name 1:University of Botswana

  • 2024.2 - 2024.3

    Staying countory name 1:Philippines   Staying institution name 1:Lepanto mine

    Staying institution name 2:National Institute of Geolgical Sciences, University of the Philippines

  • 2023.11

    Staying countory name 1:Philippines   Staying institution name 1:Marian Mine

    Staying institution name 2:Runruno MIne

    Staying institution name 3:National Institute of Geological Sciences, University of the Philippines

  • 2023.9

    Staying countory name 1:Philippines   Staying institution name 1:Masara mine

  • 2023.8 - 2023.9

    Staying countory name 1:Tanzania, United Republic of   Staying institution name 1:Kisaki area, Morogoro region

  • 2023.8

    Staying countory name 1:Malawi   Staying institution name 1:Geological Survey Department

  • 2023.7 - 2023.8

    Staying countory name 1:Indonesia   Staying institution name 1:Universitas Hasanuddin

  • 2019.8 - 2018.8

    Staying countory name 1:United States   Staying institution name 1:Colorado School of Mines

  • 2019.2 - 2019.3

    Staying countory name 1:Myanmar   Staying institution name 1:Banmauk

  • 2019.2

    Staying countory name 1:Botswana   Staying institution name 1:Botswana International University of Science and Technology

  • 2018.12

    Staying countory name 1:Philippines   Staying institution name 1:Samar Occidental

  • 2018.12

    Staying countory name 1:United Kingdom   Staying institution name 1:Natural History Museum

  • 2018.11

    Staying countory name 1:Botswana   Staying institution name 1:Mowana Mine

  • 2018.11

    Staying countory name 1:United Kingdom   Staying institution name 1:Imperial College

  • 2018.9

    Staying countory name 1:Indonesia   Staying institution name 1:Gagjah Mada University

  • 2018.8

    Staying countory name 1:Philippines   Staying institution name 1:Masara Mine

  • 2018.8

    Staying countory name 1:Tanzania, United Republic of   Staying institution name 1:Tunguru

  • 2018.6

    Staying countory name 1:Tanzania, United Republic of   Staying institution name 1:Oldoinyo Lengai, Mount Meru

  • 2018.5

    Staying countory name 1:Philippines   Staying institution name 1:Sangilo Mine

  • 2018.5

    Staying countory name 1:United Kingdom   Staying institution name 1:University of Leicester

  • 2017.11

    Staying countory name 1:Other   Staying institution name 1:エドゥアルドモンドラーネ大学

  • 2017.11

    Staying countory name 1:Myanmar   Staying institution name 1:ヤンゴン大学

    Staying institution name 2:マンダレー大学

  • 2009.4 - 2009.5

    Staying countory name 1:Philippines   Staying institution name 1:フィリピン大学

  • 2009.4

    Staying countory name 1:Philippines   Staying institution name 1:フィリピン大学

  • 2009.3

    Staying countory name 1:Indonesia   Staying institution name 1:ハサヌディン大学

  • 2009.3

    Staying countory name 1:Indonesia   Staying institution name 1:ガジャマダ大学

  • 2009.1 - 2009.2

    Staying countory name 1:Indonesia   Staying institution name 1:バツヒジャウ鉱山

  • 2008.11 - 2008.12

    Staying countory name 1:Thailand   Staying institution name 1:チュラロンコルン大学

  • 2008.10

    Staying countory name 1:Philippines   Staying institution name 1:フィリピン大学

  • 2008.9

    Staying countory name 1:Indonesia   Staying institution name 1:ガジャマダ大学

  • 2008.8

    Staying countory name 1:Indonesia   Staying institution name 1:ハサヌディン大学

  • 2008.7 - 2008.8

    Staying countory name 1:Thailand   Staying institution name 1:チュラロンコルン大学

  • 2008.5

    Staying countory name 1:Indonesia   Staying institution name 1:ガジャマダ大学

  • 2008.5

    Staying countory name 1:Indonesia   Staying institution name 1:ガジャマダ大学

  • 2008.4

    Staying countory name 1:Thailand   Staying institution name 1:チュラロンコルン大学

  • 2008.4

    Staying countory name 1:Thailand   Staying institution name 1:チュラロンコルン大学

  • 2008.3 - 2008.7

    Staying countory name 1:Indonesia   Staying institution name 1:ハサヌディン大学

  • 2008.3

    Staying countory name 1:Indonesia   Staying institution name 1:ハサヌディン大学

  • 2007.12

    Staying countory name 1:Indonesia   Staying institution name 1:ガジャマダ大学

  • 2007.10

    Staying countory name 1:Viet Nam   Staying institution name 1:ホーチミン工科大学

  • 2007.10

    Staying countory name 1:Papua New Guinea   Staying institution name 1:パプアニューギニア工科大学

  • 2007.9

    Staying countory name 1:Thailand   Staying institution name 1:チュラロンコルン大学

  • 2007.8

    Staying countory name 1:Indonesia   Staying institution name 1:ガジャマダ大学

  • Staying countory name 1:Australia   Staying institution name 1:マックオーリ−大学

    Staying countory name 2:Philippines   Staying institution name 2:フィリピン大学

    Staying countory name 3:Indonesia   Staying institution name 3:ガジャマダ大学

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