2004 Fiscal Year Final Research Report Summary
Research on kinetics in water-rock system and mechanism of enrichment and dispersion of elements
| Project/Area Number |
14204054
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Petrology/Mineralogy/Science of ore deposit
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| Research Institution | Keio University |
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Principal Investigator |
SHIKAZONO Naotatsu Keio University, Faculty of Science and Technology, Professor, 理工学部, 教授 (10011751)
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| Co-Investigator(Kenkyū-buntansha) |
MIZUTA Toshio Akita University, Faculty of Engineering and Resource Science, Professor, 工学資源学部, 教授 (80094051)
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| Project Period (FY) |
2002 – 2004
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| Keywords | water-rock interaction / hydrothermal alteration / weathering / kinetics / precipitation / partitioning of elements / epithermal gold deposits / rare earth elements |
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| Research Abstract |
Main results of this research are summarized as follows.
(1)Hydrothermal experiments on the reaction between artificial seawater and volcanic rocks (basalt, dacite) indicate that the chemical compositions of final hydrothermal solution (Ca,Ba,Sr) depend on degree of intensity of hydrothermal alteration and chemical composition of hydrothermal solution. The genesis of barite, gypsum and anhydrite can be interpreted in terms of these results.
(2)Geochemical behavior of elements in hydrothermal alteration can be clarified based on many analytical results of altered rocks in hydrothermal mining districts. The correlation between rare earth element contents, oxygen isotopic compositions and K content was found. This indicates that REE content is useful geochemical exploration index.
(3)Distribution of quartz, barite and anhydrite in Kuroko mining area was clarified and interpreted in terms of precipitation kinetics-fluid flow model.
(4)Elemental migration mechanism in weathering process was elucidated. It was found that adsorption and ionic exchange are important factors controlling the behavior of base metals and rare earth elements.
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[Journal Article] A magnetite-apatite deposit in the Fanshan alkaline ultramafic complex, northern China2004
Author(s)
Jiang, N., Chu, X., Mizuta, T., Ishiyama, D., Mi, J.
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Journal Title
Economic Geology 99
Pages: 450-461
Description
「研究成果報告書概要(和文)」より
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[Journal Article] Mobilization and enrichment of high-field strength elements during late and post-magmatic processes in the Shuiquangou syeniticcomplex, Northern China2003
Author(s)
Jiang, N., Shihua Sun, S., Chu, X., Mizuta, T., Ishiyama, D.
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Journal Title
Chemical Geology Vol.200,Issues 1-2
Pages: 117-128
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] Coexistence of a fluid phase with granitic magma : Geochemical characteristics of REEs and Cu in Miyako granite and in scheelite-bearing aplitic veins at the Yamaguchi Cu-W skarn deposit, Iwate, Japan.2002
Author(s)
Ogata, T., Ishiyama, D., Mizuta, T., Nakashima, K.
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Journal Title
Resource Geology vol.52,no.2
Pages: 173-186
Description
「研究成果報告書概要(和文)」より
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[Journal Article] Coexistence of a fluid phase with granitic magma : Geochemical characteristics of REEs and Cu in Miyako granite and in scheelite-hearing aplitic veins at the Yamaguchi Cu-W skarn deposit, Iwate, Japan.2002
Author(s)
Ogata, T., Ishiyama, D., Mizuta, T., Nakashima, K.
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Journal Title
Resource Geology vol.52,no.2
Pages: 173-186
Description
「研究成果報告書概要(欧文)」より
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