| Project/Area Number |
25287137
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Partial Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Stratigraphy/Paleontology
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| Research Institution | The University of Tokyo |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
山本 裕二 高知大学, 自然科学系, 准教授 (00452699)
横山 祐典 東京大学, 大気海洋研究所, 教授 (10359648)
七山 太 国立研究開発法人産業技術総合研究所, 地質情報研究部門, 上級主任研究員 (20357685)
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| Research Collaborator |
Sakuramoto Yukihiro 東京大学, 大気海洋研究所
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| Project Period (FY) |
2013-04-01 – 2017-03-31
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| Project Status |
Completed (Fiscal Year 2016)
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| Budget Amount *help |
¥18,460,000 (Direct Cost: ¥14,200,000、Indirect Cost: ¥4,260,000)
Fiscal Year 2015: ¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000)
Fiscal Year 2014: ¥5,070,000 (Direct Cost: ¥3,900,000、Indirect Cost: ¥1,170,000)
Fiscal Year 2013: ¥9,620,000 (Direct Cost: ¥7,400,000、Indirect Cost: ¥2,220,000)
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| Keywords | 岩石磁気学 / 生物源マグネタイト / 環境磁気学 / 海洋地質学 / 走磁性バクテリア / 西部赤道太平洋 / 地球電磁気学 / 地質学 / 古地磁気学 / 古海洋学 / 地球電磁気 |
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| Outline of Final Research Achievements |
It was revealed that biogenic magnetite abundantly occurs in oxic sediments, and is not limited within the oxic-anoxic transition zone in a sedimentary column. The abundance of bullet-shaped magnetofossils increases near the oxic-anoxic transition zone. Magnetofossils are useful for estimating paleoenvironments. Variations in relative abundance of biogenic and terrigenous magnetites contaminate estimations of relative geomagnetic paleointensity variations from sediments. Remanent magnetization lock-in depths vary among sediment cores, which may be controlled by differences in the distribution of biogenic magnetites within sedimentary columns.
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