Geomagnetic paleointensity variations during the last 40 m.y.: Possible relationship between polarity reversal frequency and paleointensity
| Project/Area Number |
22340129
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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 | 一般 |
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| Research Field |
Solid earth and planetary physics
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| Research Institution | The University of Tokyo (2012)
National Institute of Advanced Industrial Science and Technology (2010-2011) |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
YAMAMOTO Yuhji 高知大学, 海洋コア総合研究センター, 助教 (00452699)
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| Co-Investigator(Renkei-kenkyūsha) |
TAKAHASHI Futoshi 東京工業大学, 理工学研究科, 助教 (20467012)
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| Research Collaborator |
ACTON Gary University of California at Davis
RICHTER Carl University of Louisiana
SHIMONO Takaya 筑波大学, 大学院・生命環境科学研究科, 博士課程学生
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| Project Period (FY) |
2010 – 2012
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| Project Status |
Completed (Fiscal Year 2012)
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| Budget Amount *help |
¥19,630,000 (Direct Cost: ¥15,100,000、Indirect Cost: ¥4,530,000)
Fiscal Year 2012: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
Fiscal Year 2011: ¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Fiscal Year 2010: ¥13,260,000 (Direct Cost: ¥10,200,000、Indirect Cost: ¥3,060,000)
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| Keywords | 古地磁気 / 古地磁気強度 / 岩石磁気 / IODP / 東部赤道太平洋 / 古海洋 / 熱帯収束帯 / 地磁気逆転 / 地球電磁気 |
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| Research Abstract |
A paleomagnetic study was conducted using Eocene to Oligocene sediment cores taken by IODP from the east equatorial Pacific in order to obtain relative paleointensity between 23 and 42 Ma. It was revealed that long-range relative paleointensity records can be contaminated by variations of the relative abundance of biogenic and terrigenous magnetic minerals and sedimentation rates. The positive correlation between polarity reversal frequency and paleointensity that was previously suggested from the data of DSDP Site 522 is not supported. As for short-term variations on the order of 10 kyrs, paleointensity drops were found during stable polarity periods as well as at reversals. This is the same as the characteristics of paleointensity variations known for the last 3 m.y.
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Report
(4 results)
Research Products
(35 results)
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[Journal Article] A middle Miocene relative paleointensity record from the Equatorial Pacific.2013
Author(s)
Ohneiser, C., Acton, G., Chanell, J.E.T., Wilson, G.S., Yamamoto, Y., and Yamazaki, T.
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Journal Title
Earth Planet. Sci. Lett.
Volume: (in press)
Pages: 227-238
DOI
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[Journal Article] Oligocene-Miocene magnetostratigraphy of deep-sea sediments from the equatorial Pacific (IODP Site U1333).2012
Author(s)
Guidry, E.P., Richter, C., Acton, G.D.,Channell, J.E.T., Evans, H.F., Ohneiser, C., Yamamoto, Y. and Yamazaki, T.
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Journal Title
Geological Society, London, Special Publications
Volume: 373
Issue: 1
Pages: 13-27
DOI
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Peer Reviewed
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[Presentation] Long-term changes of relative paleointensity from sediments: geomagnetic field behavior or rock magnetic artifact?2011
Author(s)
Yamazaki, T., Acton, G., Channell,J., Palmer, E., Richter, C., Yamamoto, Y.
Organizer
American Geophysical Union 2011 Fall Meeting
Place of Presentation
サンフランシスコ(米国)
Year and Date
2011-12-08
Related Report
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[Presentation] Paleomagnetic and rock magnetic study of the Site U1332 sediments - relative paleointensity during Eocene and Oligocene.2011
Author(s)
Yamamoto, Y., Acton, G., Channell,J., Palmer,E., Richter, C., Yamazaki, T.
Organizer
American Geophysical Union 2011 Fall Meeting
Place of Presentation
サンフランシスコ(米国)
Year and Date
2011-12-05
Related Report
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[Presentation] Paleomagnetic and environmental magnetic properties of sediments from IODP Site U1333 (Equatorial Pacific)2010
Author(s)
Palmer, E.C., Richter, C., Acton, G., Channell, J.E.T., Evans, H.F., Ohneiser, C., Yamamoto, Y., and Yamazaki, T.
Organizer
American Geophysical Union 2010 Fall Meeting
Place of Presentation
サンフランシスコ(米国)
Year and Date
2010-12-13
Related Report
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[Presentation] Expedition 320/321 Shipboard Science Party (2010) IODP Exp.320/321 赤道太平洋年代トランセクトの概要: 特 に、古地磁気層序及び還元による堆積物の 色相変化について.2010
Author(s)
山 崎俊嗣、 Acton, G., Channell, J., Evans, H., Ohneiser, C., Richiter, C. 山 本裕二、Delaney, M., Gussone, N., Hathorne, E.、木元 克典、沢田 健、山本 真 也
Organizer
日本地質学会第117年学術大会
Place of Presentation
富山大学(富山市)
Year and Date
2010-09-20
Related Report
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[Presentation] Expedition320/321ShipboardScienceParty(2010)IODPExp.320/321赤道太平洋年代トランセクトの概要報告:古地磁気層序、還元による堆積物の色相変化.2010
Author(s)
山崎俊嗣、Acton,G.,Channell,J.,Evans,H.,Ohneiser,C.,Richiter,C.山本裕二、Delaney,M.,Gussone,N.,Hathorne,E.,木元克典、沢田健、山本真也
Organizer
日本地球惑星科学連合2010年大会
Place of Presentation
幕張メッセ国際会議場(千葉市)
Year and Date
2010-05-24
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