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Investigation on variations of the geomagnetic paleo-intensity using deep-tow and sea-surface magnetic anomalies

Research Project

Project/Area Number 15H05207
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section海外学術
Research Field Solid earth and planetary physics
Research InstitutionKobe University

Principal Investigator

Seama Nobukazu  神戸大学, 理学研究科, 教授 (30270862)

Co-Investigator(Kenkyū-buntansha) 沖野 郷子  東京大学, 大気海洋研究所, 教授 (30313191)
佐藤 太一  国立研究開発法人産業技術総合研究所, 地質調査総合センター, 主任研究員 (50613246)
野木 義史  国立極地研究所, 研究教育系, 教授 (90280536)
藤井 昌和  国立極地研究所, 研究教育系, 助教 (80780486)
Project Period (FY) 2015-04-01 – 2019-03-31
Project Status Completed (Fiscal Year 2019)
Budget Amount *help
¥16,120,000 (Direct Cost: ¥12,400,000、Indirect Cost: ¥3,720,000)
Fiscal Year 2018: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
Fiscal Year 2017: ¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2016: ¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Fiscal Year 2015: ¥5,200,000 (Direct Cost: ¥4,000,000、Indirect Cost: ¥1,200,000)
Keywords地球磁場変動 / 地磁気異常 / 海洋底の磁化
Outline of Final Research Achievements

The Cretaceous Normal Superchron (CNS) is a ~40 Myr-long period extending between Chrons M0 and 34 (~120-83 Ma) during which the geomagnetic field polarity remained normal. Systematic variations of the geomagnetic paleointensity have been suggested based on a deep-tow magnetic profile acquired in the Central Atlantic Ocean and selected sea-surface magnetic profiles worldwide crossing the whole CNS (Granot et al., 2012). We extend this study by using three additional data sets acquired in the South-Western Indian Ocean, the Northern Indian Ocean, and the Northern Pacific Ocean. Our analysis on these data do not well support the previous hypothesis of the geomagnetic paleointensity variation within the CNS. Further, our results indicate that it is of crucial importance to assess the two-dimensional character of the magnetized sources, because it leads to avoid interpreting spurious local effects as paleointensity variations and to derive a reliable geomagnetic paleointensity variation.

Academic Significance and Societal Importance of the Research Achievements

海洋地殻形成の拡大速度から、太平洋ハワイ沖での海上観測での地磁気異常データから推定する古地磁気変動の時間分解能は、大西洋やインド洋での深海観測での地磁気異常データによる時間分解能とほぼ同等であることが確認できた。また、地磁気異常の変化から古地磁気変動の記録を抽出するためには、磁化原因物体の2次元性の吟味と3次元性の影響の除去が必須である。このことから、長期間にわたって地磁気逆転が起きなかった特異な時期である白亜紀スーパークロンにおける古地磁気変動の情報を得るには、太平洋ハワイ沖での複数測線での海上地磁気観測が鍵であり、この情報が地磁気成因の理解を進めるために重要であることが分かった。

Report

(5 results)
  • 2019 Final Research Report ( PDF )
  • 2018 Annual Research Report
  • 2017 Annual Research Report
  • 2016 Annual Research Report
  • 2015 Annual Research Report
  • Research Products

    (23 results)

All 2019 2018 2017 2016 Other

All Int'l Joint Research (6 results) Journal Article (5 results) (of which Peer Reviewed: 5 results,  Open Access: 2 results) Presentation (12 results) (of which Int'l Joint Research: 4 results)

  • [Int'l Joint Research] パリ地球物理研究所(フランス)

    • Related Report
      2018 Annual Research Report
  • [Int'l Joint Research] アルフレッド・ヴェーゲナー極地海洋研究所(ドイツ)

    • Related Report
      2018 Annual Research Report
  • [Int'l Joint Research] パリ地球物理研究所(フランス)

    • Related Report
      2017 Annual Research Report
  • [Int'l Joint Research] アルフレッド・ヴェーゲナー極地海洋研究所(ドイツ)

    • Related Report
      2017 Annual Research Report
  • [Int'l Joint Research] Institut de Physique du Globe de Pari(France)

    • Related Report
      2016 Annual Research Report
  • [Int'l Joint Research] Institut de Physique du Globe de Paris(France)

    • Related Report
      2015 Annual Research Report
  • [Journal Article] Origin of the Southern Ocean2018

    • Author(s)
      佐藤暢、野木義史,、藤井昌和,、佐藤太一
    • Journal Title

      低温科学

      Volume: 76 Pages: 243-258

    • DOI

      10.14943/lowtemsci.76.243

    • NAID

      120006466504

    • ISSN
      1880-7593
    • Year and Date
      2018-03-31
    • Related Report
      2017 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Near-seafloor magnetic mapping of off-axis lava flows near the Kairei and Yokoniwa hydrothermal vent fields in the Central Indian Ridge2018

    • Author(s)
      Fujii Masakazu、Okino Kyoko
    • Journal Title

      Earth, Planets and Space

      Volume: 70 Issue: 1 Pages: 1-17

    • DOI

      10.1186/s40623-018-0959-5

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Crustal formation and evolution processes in the Natal Valley and Mozambique Ridge, off South Africa2017

    • Author(s)
      Hanyu Tomoko、Nogi Yoshifumi、Fujii Masakazu
    • Journal Title

      Polar Science

      Volume: 13 Pages: 66-81

    • DOI

      10.1016/j.polar.2017.06.002

    • Related Report
      2017 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Origin of magnetic highs at ultramafic hosted hydrothermal systems: Insights from the Yokoniwa site of Central Indian Ridge2016

    • Author(s)
      Fujii M., Okino, K., Sato, T., Sato H., and Nakamura K.
    • Journal Title

      Earth and Planetary Science Letters

      Volume: 441 Pages: 26-37

    • DOI

      10.1016/j.epsl.2016.02.018

    • Related Report
      2016 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Magnetic anomalies associated with abundant production of pyrrhotite in a sulfide deposit in the Okinawa Trough, Japan2016

    • Author(s)
      Honsho C., Yamazaki T., Ura T., Okino K., Morozumi H. and Ueda S.
    • Journal Title

      Geochemistry. Geophysics. Geosystems

      Volume: 17 Pages: 4413-4424

    • Related Report
      2016 Annual Research Report
    • Peer Reviewed
  • [Presentation] The origins of southern part of Madagascar Plateau and Del Cano Rise, based on re-estimated seafloor spreading history of Southwest Indian ridge 35°E to 55°E2019

    • Author(s)
      Sato Taichi、Nogi Yoshifumi、Sato Hiroshi、Fujii Masakazu
    • Organizer
      ISAES 2019
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 白亜紀スーパークロンの古地球磁場変動2019

    • Author(s)
      島 伸和、Jerome Dyment、佐藤 太一、Yves Gallet、沖野 郷子、Roi Granot、野木 義史、望月 伸竜、山崎 俊嗣
    • Organizer
      InterRidge-Japan研究集会「海洋地殻-マントルの新たな実像:オマーン掘削から、海域観測から」
    • Related Report
      2018 Annual Research Report
  • [Presentation] Submersible magnetics reveals relationship between off-axis volcanism and hydrothermal systems of the Kairei and Yokoniwa fields at the Central Indian Ridge2019

    • Author(s)
      藤井昌和、沖野郷子
    • Organizer
      日本地球惑星科学連合2019年大会
    • Related Report
      2018 Annual Research Report
  • [Presentation] The Cretaceous Normal Superchron: records from the Pacific, Indian and Atlantic oceanic crust2019

    • Author(s)
      島 伸和、Jerome Dyment、佐藤 太一、Yves Gallet、沖野 郷子、Roi Granot、野木 義史、望月 伸竜、山崎 俊嗣
    • Organizer
      日本地球惑星科学連合2019年大会
    • Related Report
      2018 Annual Research Report
  • [Presentation] Near-seafloor magnetics of off-axis volcanism near the Kairei and Yokoniwa hydrothermal fields of the Central Indian Ridge2018

    • Author(s)
      Fujii Masakazu、Okino Kyoko
    • Organizer
      American Geophysical Union 2018 Fall Meeting
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Tectonics of long-offset oceanic transform faults along the Central Indian Ridge2017

    • Author(s)
      沖野郷子・島伸和・藤井昌和・町田嗣樹
    • Organizer
      日本地球惑星科学連合2017年大会
    • Related Report
      2017 Annual Research Report
  • [Presentation] Magnetic anomaly mapping around Antarctica2017

    • Author(s)
      Nogi, Yoshifumi
    • Organizer
      日本地球惑星科学連合2017年大会
    • Related Report
      2017 Annual Research Report
  • [Presentation] トランスフォーム断層における地磁気異常の要因の推定2017

    • Author(s)
      古川優和・藤井昌和・島伸和・沖野 郷子
    • Organizer
      海洋リソスフェアの蛇紋岩化作用と物理・化学・生物プロセス~InterRidge-Japan研究集会~
    • Related Report
      2017 Annual Research Report
  • [Presentation] Revisiting the Cretaceous Normal Superchron in the SW Indian Ocean2017

    • Author(s)
      Dyment, J., Y. Gallet, R. Granot, N. Seama, M. Blanc, H. Choe, K. Okino, A. Pasenko, M. Phua, C. Poitou, S. Roth, T. Sato, T. Zhang, C. Hemond, E. Kraus, M. Makuzeni, G. Raifman, V. S. Razafimamonjy, A. Schatz and F. Resseguier
    • Organizer
      American Geophysical Union 2017 Fall Meeting
    • Related Report
      2017 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Tectonics of long-offset oceanic transform faults along the Central Indian Ridge2016

    • Author(s)
      Okino K., Seama N., Fujii M. and Machida S.
    • Organizer
      American Geophysical Union 2016 Fall Meeting
    • Place of Presentation
      SanFrancisco (USA)
    • Year and Date
      2016-12-12
    • Related Report
      2016 Annual Research Report
    • Int'l Joint Research
  • [Presentation] KH-15-1 白鳳丸研究航海速報:長大トランスフォーム断層と海嶺活動 CIR13-18S2016

    • Author(s)
      沖野郷子・島伸和・砂村倫成・町田嗣樹・KH-15-5研究者
    • Organizer
      日本地球惑星科学連合2016年大会
    • Place of Presentation
      幕張メッセ(千葉県・千葉市)
    • Year and Date
      2016-05-22
    • Related Report
      2016 Annual Research Report
  • [Presentation] フラクチャーゾーン、トランスフォーム断層を横切る深海地磁気調査2016

    • Author(s)
      島伸和・北川高行・沖野郷子・藤井昌和・中東和夫・岡本理・古川優和・小林拓史・野木義史
    • Organizer
      日本地球惑星科学連合2016年大会
    • Place of Presentation
      幕張メッセ(千葉県・千葉市)
    • Year and Date
      2016-05-22
    • Related Report
      2016 Annual Research Report

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Published: 2015-04-16   Modified: 2022-11-04  

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