| Project/Area Number |
61540587
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
鉱物学(含岩石・鉱床学)
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| Research Institution | University of Tokyo |
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Principal Investigator |
SHIMAZAKI Hidehiko Faculty of Science, University of Tokyo. Professor, 理学部, 教授 (50013751)
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| Co-Investigator(Kenkyū-buntansha) |
SHIMIZU Masaaki University Museum, University of Tokyo. Assistant Prof., 総合研究資料館, 助手 (50162714)
SHIKAZONO Naotatsu Faculty of Science, University of Tokyo. Assistant Prof., 理学部, 助手 (10011751)
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| Project Period (FY) |
1986 – 1987
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| Project Status |
Completed (Fiscal Year 1987)
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| Budget Amount *help |
¥1,500,000 (Direct Cost: ¥1,500,000)
Fiscal Year 1987: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1986: ¥1,000,000 (Direct Cost: ¥1,000,000)
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| Keywords | Skarn-type deposits / Ore-forming fluids / Magmatic water / Meteoric water / Light stable isotope ratios / Hydrothermal solution system / チタン鉄鉱系深成岩 / 熱水系 / スカルン型鉱床 / 白亜紀珪長質火山活動 / 亜鉛・鉛鉱床 / 同位体変質 / 神岡鉱床 |
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| Research Abstract |
The skarn-type deposits in Japan are classified into five groups based on the past production: Zn-Pb, Zn-Cu(-Fe), Cu(-Fe), Sn and W. The Japanese island arc could be divided into several regions by the tectonic lines. In each region, different kinds of felsic igneous activities are observed. The felsic igneous rocks associated with the skarn-type deposits, are divided into a magnetiteseries and an ilmenite-series. Depth of the formation of deposits is estimated from the texture of associated felsic igneous rocks, that is, volcanic of plutonic. In most of the studied deposits, <delta>^<18>O values of the hydrothermal solutions are in the range of magmatic fluids. Such a solution is either magmatic in origin, or has isotopically equilibrated with felsic igneous rocks. The solution with light oxygen isotope values were mainly from Zn-Pb and Zn-Cu deposits formed in shallow environments, suggesting a contribution of surface-derived water for the deposits. The contribution of biogenic carbon and sulfur is apparent in Sn, W and some Cu deposits. Carbon and sulfur isotope values show a positive correlation.
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