| Project/Area Number |
23403016
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 海外学術 |
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| Research Field |
Petrology/Mineralogy/Science of ore deposit
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| Research Institution | Yokohama National University |
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Principal Investigator |
ARIMA Makoto 横浜国立大学, 環境情報研究院, 教授 (10184293)
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| Co-Investigator(Renkei-kenkyūsha) |
SHIRAISHI Kazuyuki 国立極地研究所, 研究教育系, 所長 (90132711)
WADA Hideki 静岡大学, 理学部, 教授 (20126791)
ISHIKAWA Masahiro 横浜国立大学, 大学院・環境情報研究院, 教授 (70232270)
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| Research Collaborator |
RAKOTONDRAZAFY Raymond マダガスカル共和国, アナンタナナリボ大学, 理学部, 教授
RAMBELOSON Roger マダガスカル共和国, アナンタナナリボ大学, 理学部, 准教授
MAZUMDER Rajat インド統計学研究所, 准教授
MALVIYA Vivek インド地質調査所, 研究員
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| Project Period (FY) |
2011-04-01 – 2014-03-31
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| Project Status |
Completed (Fiscal Year 2013)
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| Budget Amount *help |
¥19,760,000 (Direct Cost: ¥15,200,000、Indirect Cost: ¥4,560,000)
Fiscal Year 2013: ¥5,850,000 (Direct Cost: ¥4,500,000、Indirect Cost: ¥1,350,000)
Fiscal Year 2012: ¥6,110,000 (Direct Cost: ¥4,700,000、Indirect Cost: ¥1,410,000)
Fiscal Year 2011: ¥7,800,000 (Direct Cost: ¥6,000,000、Indirect Cost: ¥1,800,000)
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| Keywords | マダガスカル / カーボナタイト / ゴンドワナ超大陸 / 炭素・酸素安定同位体 / Sr同位体比 / Nd同位体比 / Sr-Nd同位体 / マントル交代作用 |
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| Research Abstract |
Carbonatites have been identified in the Proterozoic terrain of southern Madagascar and studied for mineralogy, whole-rock geochemistry, stable C- and O-isotopes, and radiogenic Sr- and Nd-isotopes. Carbon and oxygen stable isotopes in the carbonates show magmatic differentiation form the primary mantle carbonate field toward heavier values, suggesting magmatic isotopic fractionation. Both carbonate and associated pyroxenites are characterized by extremely enriched Sr- and depleted Nd-isotope compositions. The present data imply that the studied carbonates are silicocarbonatite derived from extremely enriched sources, which were located at the upper part of lithospheric mantle.
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