| Project/Area Number |
06302030
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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 | 総合 |
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| Research Field |
Petrology/Mineralogy/Science of ore deposit
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| Research Institution | University of Tokyo |
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Principal Investigator |
UTADA Minoru Univ. of Tokyo, University Museum, Prof., 総合研究博物館, 教授 (50012406)
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| Co-Investigator(Kenkyū-buntansha) |
NISHIDO Hirotsugu Okayama Univ. Inst. Nat. Sci., Assist. Prof., 自然科学研究所, 教授 (30140487)
CHIBA Hitoshi Kyushu Univ., Fac. of Sci., Assist. Prof., 理学部, 助教授 (30144736)
INOUE Atsuyuki Chiba Univ., Fac. of Sci., Prof., 理学部, 教授 (30150270)
KITAGAWA Ryuji Hiroshima Univ., Fac. of Sci., Assist. Prof., 理学部, 助教授 (70112167)
SHIMIZU Masaaki Univ. of Tokyo, University Museum, Assist., 総合研究博物館, 助手 (50162714)
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| Project Period (FY) |
1994 – 1996
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| Keywords | hydrothermal system / Satsunan geothermal area / Sumikawa geothermal area / Sanzu River geothermal area / Shakotan-Toya area / Chugoku region / K-Ar age / minute structure of clay minerals |
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| Research Abstract |
1. Chemical and isotropic systematics at the Satsunan coastal hydrothermal system, was clarified as an analogue of back-arc ocean-floor hydrothermal system.
2.33 alteration minerals in Sumikawa active geothermal system, were identified, some of which revealed that hydrothermal alteration by present hydrothermal circulation was distinguished from thermal metamorphism by granitic rocks.
3. Thermal metamorphism and 3 kinds of hydrothermal alteration including caldera-type zeolitization in Sanzu River caldera, were confirmed.
4.3 stages (middle Miocene, late Miocene and post-Pliocene) of geothermal activity in Shakotan-Toya area, were disclosed, based on K-Ar age determination.
5. Hydrothermal vicissitudes in Chugoku region from late Cretacious to paleogene time were brought out.
6. Mechanism of illitization and chloritization of smectite was pointed out, based on TEM and HRTEM observation of interstratified minerals.
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