| 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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| Project Status |
Completed (Fiscal Year 2004)
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| Budget Amount *help |
¥52,260,000 (Direct Cost: ¥40,200,000、Indirect Cost: ¥12,060,000)
Fiscal Year 2004: ¥8,580,000 (Direct Cost: ¥6,600,000、Indirect Cost: ¥1,980,000)
Fiscal Year 2003: ¥14,430,000 (Direct Cost: ¥11,100,000、Indirect Cost: ¥3,330,000)
Fiscal Year 2002: ¥29,250,000 (Direct Cost: ¥22,500,000、Indirect Cost: ¥6,750,000)
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| Keywords | water-rock interaction / hydrothermal alteration / weathering / kinetics / precipitation / partitioning of elements / epithermal gold deposits / rare earth elements / 熱水性鉱床 / 黒鉱鉱床 / 硫酸塩鉱物 / 熱水変質作用 / 土壌 / 花崗岩 / 水-岩石反応 / 重金属元素 / 地下水 |
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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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