| Project/Area Number |
15K05317
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Geology
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| Research Institution | Senshu University |
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Principal Investigator |
SATO HIROSHI 専修大学, 経営学部, 教授 (50365847)
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| Co-Investigator(Kenkyū-buntansha) |
町田 嗣樹 千葉工業大学, 次世代海洋資源研究センター, 上席研究員 (40444062)
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| Co-Investigator(Renkei-kenkyūsha) |
SENDA Ryoko 九州大学, 比較社会文化研究院, 准教授 (50377991)
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| Project Period (FY) |
2015-04-01 – 2018-03-31
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| Project Status |
Completed (Fiscal Year 2017)
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| Budget Amount *help |
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2017: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2016: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Fiscal Year 2015: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
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| Keywords | 中央海嶺玄武岩 / マントル不均質 / 中央インド洋海嶺 |
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| Outline of Final Research Achievements |
Trace element compositions and isotope compositions were analyzed for mid-ocean ridge basalts from the southernmost segment of Central Indian Ridge to reveal actual spatiotemporal distributions of mantle heterogeneity. Our results show the correlation between trace element compositions (e.g., Nb/Zr) and Sr isotope ratio. Particularly mid-ocean ridge basalts collected far from the present spreading axis of Central Indian Ridge have depleted trace element compositions (e.g., low Nb/Zr) and high Sr isotope ratio. Nd isotope ratio has no correlation with both trace element compositions and Sr isotope ratio. We concluded that source mantles which generated older mid-ocean ridge basalts have lower Nb/Zr and higher Rb/Sr ratios at the southernmost segment of Central Indian Ridge.
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