| Project/Area Number |
16540437
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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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 | Chiba University |
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Principal Investigator |
INOUE Atsuyuki Chiba University, Faculty of Science, Professor, 理学部, 教授 (30150270)
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| Project Period (FY) |
2004 – 2006
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| Project Status |
Completed (Fiscal Year 2006)
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| Budget Amount *help |
¥3,700,000 (Direct Cost: ¥3,700,000)
Fiscal Year 2006: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 2005: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 2004: ¥2,400,000 (Direct Cost: ¥2,400,000)
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| Keywords | smectite / illite / mixed-layer minerals / stable isotopes / hydrothermal alteration / oxyso anions / XRD構造解析 / HRTEM像 / カオリン鉱物 / ポリタイプ / EBSD / イライトースメクタイト混合層鉱物 / 溶解再結晶作用 |
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| Research Abstract |
Study on smectite-to-illite transformation mechanism, using the core samples IT-2 from the Kakkonda geothermal field, has been successfully completed and the results have been published in five papers of international and national journals. In this year, we worked on motmorillonite-to-beidellite transformation at Bouillante geothermal field, Guadeloupe as an application of our current model of smectite-to-illite transformation mechanism. Detailed XRD, FTIR and chemical analyses clearly demonstrated a transition from montmorillonite to beidellite with increasing depth and temperature via interstratification of the two layers. However this transition was not explained by a thermally controlled beidellitization but control of solution composition related to the precipitation of clays, based on the carbon and oxygen isotopes data analysis. This conclusion is reasonably accepted from the viewpoint of our current model of smectite-to-illite transformation mechanism. This result has been submitted to an article of American Mineralogist co-authored with French colleagues.
In the next step, it is important to understand the precipitation dynamics of clay minerals in water-rock interaction. It is not easy that experimental works undertakes to understand the behavior of silicate ions in solution. Instead of crystallization of silicates, thus, we started working on crystallization process of iron oxyhydroxide minerals, especially focusing on understanding of the role of anions in the formation of FeOOH minerals. We have interested results on this subject and published two papers.
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