| Project/Area Number |
62043051
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| Research Category |
Grant-in-Aid for Overseas Scientific Research
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| Allocation Type | Single-year Grants |
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| Section | 調査総括 |
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| Research Institution | Okayama University |
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Principal Investigator |
MITSUNO Chiharu Faculty of Science, Okayama University. Professor, 理学部, 教授 (40033013)
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| Co-Investigator(Kenkyū-buntansha) |
SUZUKI Shigeyuki Faculty of Science, Okayama University Assistant, 理学部, 助手 (00183418)
OHO Yukimasa Faculty of Integrated Arts and Sciences, Hiroshima University Lecturer, 総合科学部, 講師 (80152560)
KASE Katsuo Faculty of Science, Okayama University Lecturer, 理学部, 講師 (30033195)
YAMAMOTO Masahiro Faculty of Science, Okayama University. Ass.Professor, 理学部, 助教授 (60033130)
NAKAMURA Takeshi Faculty of Science, Osaka City University. Professor, 理学部, 教授 (60046761)
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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 |
¥2,900,000 (Direct Cost: ¥2,900,000)
Fiscal Year 1987: ¥2,900,000 (Direct Cost: ¥2,900,000)
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| Keywords | Iberian Pyrite Belt / Yanahara ore deposit / Rio Tinto mime / Nerves-Corvo mine / Tharsis mine / colloform texture / コロホルム組織 / 舞鶴帯 |
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| Research Abstract |
Sedimentary structures are observed in pyrite ores of the Tharsis, Sotiel mines and so on. These structures show that some of ore bodies deposited on the submarine slope and then were transported along the submarine slope by slumping. The ore deposits ans country rocks have suffered from three stages of folding based on structual and micro-structural analyses. The first stage folidng is more intense than later two foldings and controles the distribution pattern of the rocks.
The deposits are divided into three groups by characteristic minerals : pyrrhotite-rich, barite-rich, and tin and copper-rich deposits. These narures of individual deposits may reflect the differences in oxidation-reduction states of mineral deposition, and the the temperatures of hydrothermal solutions responsible for these deposits.
From the sulfur analyses, the deposits of the belt are divided into four groups : deposits having positive<delta>^<34>s values(San Telmo Group), having most positive<delta>^<34>s values (Rio Tinto group), haning most negative<delta>^<34>s values(Tharsis group) and occupying the intermediate position between Rio Tinto and Tharsis groups (Aljustrel group).
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