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Investigation on upper mantle heterogeneity through sea-floor spreading system

Research Project

Project/Area Number 15H03717
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
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) 三ヶ田 均  京都大学, 工学研究科, 教授 (10239197)
松野 哲男  神戸大学, 海洋底探査センター, 特命講師 (80512508)
Research Collaborator Nakakuki Tomoeki  
Nakahigashi Kazuo  
Nogi Yoshifumi  
Morishita Tomoaki  
Sato Hiroshi  
Harigane Yumiko  
Ogawa Kazunori  
Project Period (FY) 2015-04-01 – 2019-03-31
Project Status Completed (Fiscal Year 2018)
Budget Amount *help
¥17,420,000 (Direct Cost: ¥13,400,000、Indirect Cost: ¥4,020,000)
Fiscal Year 2018: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2017: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2016: ¥7,280,000 (Direct Cost: ¥5,600,000、Indirect Cost: ¥1,680,000)
Fiscal Year 2015: ¥6,890,000 (Direct Cost: ¥5,300,000、Indirect Cost: ¥1,590,000)
Keywords海洋底地球科学 / 上部マントル比抵抗構造 / マントル不均質 / 海底拡大系 / 背弧海盆 / 内部構造
Outline of Final Research Achievements

Our main results of 2-D electrical resistivity structure and of numerical simulation lead us to propose a hypothesis that the low viscosity region in the mantle wedge due to hydration driven by water release from the subducting slab results in highly asymmetric seafloor spreading, which is commonly recognized in many back-arc basins. The resistivity structure was imaged through marine magnetotelluric experiment across a spreading segment in the Southern Mariana Trough back-arc basin. This result shows that a low resistivity region exists beneath the spreading axis and is asymmetrically extended to the subducting slab; the low resistivity region is interpreted as asymmetric melting in the mantle wedge due to hydration driven by water release from the subducting slab. Further, numerical simulation results indicate that the spreading axis is kept locating above the low viscosity mantle zone that capture the mantle upwelling zone due to water release from the subducting slab.

Academic Significance and Societal Importance of the Research Achievements

背弧海盆の形成では、その初期には非対称な海洋底拡大を伴っていることが多い。上部マントルの拡大軸に対しての非対称な比抵抗構造と、背弧拡大の変遷を示す数値モデリングの結果から、非対称な海洋底拡大の要因を説明するモデルを提案し、背弧海盆形成の新しい知見が得られた。すなわち、スラブから脱水した水により上部マントルに不均質な構造が生じ、水による粘性低下などにより、非対称な海洋底拡大が起こることが分かった。

Report

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

    (20 results)

All 2019 2018 2017 2016 2015 Other

All Int'l Joint Research (2 results) Journal Article (7 results) (of which Peer Reviewed: 5 results,  Open Access: 2 results) Presentation (11 results) (of which Int'l Joint Research: 5 results,  Invited: 1 results)

  • [Int'l Joint Research] ソウル大学(韓国)

    • Related Report
      2016 Annual Research Report
  • [Int'l Joint Research] Seoul National University(韓国)

    • Related Report
      2015 Annual Research Report
  • [Journal Article] Dynamics in the Uppermost Lower Mantle: Insights into the Deep Mantle Water Cycle Based on the Numerical Modeling of Subducted Slabs and Global-Scale Mantle Dynamics2019

    • Author(s)
      Nakagawa Takashi、Nakakuki Tomoeki
    • Journal Title

      Annual Review of Earth and Planetary Sciences

      Volume: 47 Issue: 1 Pages: 41-66

    • DOI

      10.1146/annurev-earth-053018-060305

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed
  • [Journal Article] A new miniaturized magnetometer system for long-term distributed observation on the seafloor2018

    • Author(s)
      Ogawa Kazunori、Matsuno Tetsuo、Ichihara Hiroshi、Nakahigashi Kazuo、Seama Nobukazu
    • Journal Title

      Earth, Planets and Space

      Volume: 70 Issue: 1 Pages: 111-111

    • DOI

      10.1186/s40623-018-0877-6

    • NAID

      120006491592

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Roles of Hydrous Lithospheric Mantle in Deep Water Transportation and Subduction Dynamics2018

    • Author(s)
      Nakao Atsushi、Iwamori Hikaru、Nakakuki Tomoeki、Suzuki Yujiro J.、Nakamura Hitomi
    • Journal Title

      Geophysical Research Letters

      Volume: 45 Issue: 11 Pages: 5336-5343

    • DOI

      10.1029/2017gl076953

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Damage Detection on Invisible Reverse Side of Planar Steel Using Disturbance Measurement of Magnetic Flux2018

    • Author(s)
      Nakagawa T.、Mikada H.、Takekawa J.
    • Journal Title

      80th EAGE Conference and Exhibition 2018

      Volume: -

    • DOI

      10.3997/2214-4609.201801296

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Simulation and Imaging of CSEM Data using Fictitious Domain2018

    • Author(s)
      S Amani、H Mikada、J Takekawa
    • Journal Title

      Asia Petroleum Geoscience Conference and Exhibition

      Volume: - Pages: 51-55

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Reservoir Monitoring by CSEM Data: A Fictitious Domain Strategy2018

    • Author(s)
      Amani S.、Mikada H.、Takekawa J.
    • Journal Title

      Offshore Technology Conference

      Volume: -

    • DOI

      10.4043/28274-ms

    • Related Report
      2017 Annual Research Report
  • [Journal Article] Applicability of Phased Array Antenna to Ground Penetrating Radar for Subsurface Imaging Below Surface Obstacles2016

    • Author(s)
      Kikuchi K.K.、Mikada H.、Takekawa J.T.
    • Journal Title

      Proc. 78th EAGE Conference and Exhibition 2016

      Volume: - Pages: 1-5

    • DOI

      10.3997/2214-4609.201601400

    • Related Report
      2016 Annual Research Report
  • [Presentation] 背弧海盆の非対称拡大を説明する仮説:南マリアナトラフでの観測事実と数値シミュレーション2018

    • Author(s)
      島伸和・中久喜伴益・松野哲男・沖野郷子
    • Organizer
      日本地球惑星科学連合2018年大会
    • Related Report
      2018 Annual Research Report
  • [Presentation] Seafloor electromagnetic investigations of the upper mantle of the Mariana back-arc spreading and subduction system2018

    • Author(s)
      Matsuno, T., and N. Seama
    • Organizer
      Japan Geoscience Union Meeting 2018
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 南部マリアナ背弧拡大海嶺下の上部マントル比抵抗構造の解明2018

    • Author(s)
      松野哲男・島伸和・新藤悠・野木義史・沖野郷子
    • Organizer
      地球電磁気・地球惑星圏学会 第144回総会及び講演会
    • Related Report
      2018 Annual Research Report
  • [Presentation] 伊豆・小笠原・マリアナ弧の背弧海盆で見られる2種類の上部海洋地殻地震波速度構造2017

    • Author(s)
      古川優和・島伸和・高橋成実・海宝由佳・小平秀一
    • Organizer
      日本地球惑星科学連合2017年大会
    • Related Report
      2017 Annual Research Report
  • [Presentation] 背弧海盆の非対称拡大はどのようにして起こるのか?-南マリアナトラフでの観測事実と数値シミュレーション-2017

    • Author(s)
      島伸和・中久喜伴益・松野哲男・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] Enhanced and asymmetric melting beneath the southern Mariana back-arc spreading ridge under the influence of the Pacific plate subduction2017

    • Author(s)
      Matsuno, T., N. Seama, H.Shindo, Y. Nogi and K. Okino
    • Organizer
      American Geophysical Union 2017 Fall Meeting
    • Related Report
      2017 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Mantle heterogeneity beneath the Mariana Trough Back-Arc Basin2017

    • Author(s)
      Seama, N.
    • Organizer
      Collaborative research in global ocean and subduction - Toward Pacific Array
    • Related Report
      2016 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 太平洋プレートの沈み込みの影響を受けた南部マリアナ背弧拡大海嶺下の豊富で非対称な部分溶融2016

    • Author(s)
      松野哲男・島伸和・新藤悠・野木義史・沖野郷子
    • Organizer
      日本地球惑星科学連合2016年大会
    • Related Report
      2016 Annual Research Report
  • [Presentation] 不均質地下構造探査への位相アレイ型地中レーダ適用性の研究2016

    • Author(s)
      菊地海斗・三ケ田均・武川順一
    • Organizer
      平成28年度資源・素材関係学協会合同秋季大会
    • Related Report
      2016 Annual Research Report
  • [Presentation] Enhanced and asymmetric melting beneath the southern Mariana back-arc spreading ridge, influenced by the subduction of the Pacific plate,2016

    • Author(s)
      Matsuno, T., N. Seama, H. Shindo, Y. Nogi and K. Okino
    • Organizer
      23rd Electromagnetic Induction Workshop
    • Related Report
      2016 Annual Research Report
    • Int'l Joint Research
  • [Presentation] A review of electromagnetic approaches to the seafloor spreading ridge system2015

    • Author(s)
      Matsuno, T. and N. Seama
    • Organizer
      Third InterRidge Theoretical Institute
    • Place of Presentation
      Hangzhou, China
    • Year and Date
      2015-09-25
    • Related Report
      2015 Annual Research Report
    • Int'l Joint Research / Invited

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Published: 2015-04-16   Modified: 2022-08-30  

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