Advance of paleo- and rock magnetism by unraveling roles of biogenic magnetite
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 |
Section | 一般 |
Research Field |
Stratigraphy/Paleontology
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Research Institution | The University of Tokyo |
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 |
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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Report
(5 results)
Research Products
(34 results)
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[Journal Article] Formation and geomorphologic history of the Lonar impact crater deduced from in situ cosmogenic 10Be and 26Al2014
Author(s)
Nakamura, A., Yokoyama, Y., Sekine, Y., Goto, K., Komatsu, G., Kumar, P.S., Matsuzaki, H., Kaneoka, I., Matsui, T.
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Journal Title
Geochemistry, Geophysics, Geosystems
Volume: 15
Issue: 8
Pages: 3190-3197
DOI
Related Report
Peer Reviewed
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[Journal Article] Sea-ice conditions in the Okhotsk Sea during the last 550 kyr deduced from environmental magnetism2013
Author(s)
Yamazaki, T., Inoue, S., Shimono, T.,Sakamoto, T., Sakai, S
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Journal Title
Geochemistry, Geophysics, Geosystems
Volume: Volume 14, Issue 12
Issue: 12
Pages: 5026-5040
DOI
Related Report
Peer Reviewed
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[Journal Article] Low-temperature magnetic properties of pelagic carbonates: Oxidation of biogenic magnetite and identification of magnetosome chains2013
Author(s)
Chang, L., Winklhofer, M., Roberts, A. P., Heslop, D., Florindo, F., Dekkers, M. J., Krijgsman, W., Kodama, K., and Yamamoto, Y.
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Journal Title
Journal of Geophysical Research
Volume: 118
Issue: 12
Pages: 1-17
DOI
Related Report
Peer Reviewed
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[Presentation] Distribution of magnetofossils in deep-sea surface sediments with Fe-redox boundary2015
Author(s)
Yamazaki, T., Suzuki, Y., Kawamura, N., Seike, K., Sakuramoto, Y., and Okutsu N.
Organizer
2015 AGU Fall Meeting
Place of Presentation
モスコーニセンター(米国サンフランシスコ)
Year and Date
2015-12-14
Related Report
Int'l Joint Research
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