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Volcanic activity on subducting Pacific plate with change of the stress field after an earthquake on plate boudary

Research Project

Project/Area Number 24654180
Research Category

Grant-in-Aid for Challenging Exploratory Research

Allocation TypeSingle-year Grants
Research Field Geochemistry/Astrochemistry
Research InstitutionTohoku University

Principal Investigator

HIRANO Naoto  東北大学, 東北アジア研究センター, 准教授 (00451831)

Project Period (FY) 2012-04-01 – 2014-03-31
Project Status Completed (Fiscal Year 2013)
Budget Amount *help
¥3,510,000 (Direct Cost: ¥2,700,000、Indirect Cost: ¥810,000)
Fiscal Year 2013: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2012: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Keywordsプチスポット / 太平洋プレート / 年代測定 / 玄武岩 / 日本海溝 / 巨大地震 / 火山 / 地震 / プレート / 海洋調査 / 海底地形
Research Abstract

The new kind submarine volcanoes, petit-spot, were erupted on the subducting plate, which occur in a region of the plate-flexure prior to subduction into the trench off NE Japan. Monogenetic petit-spot volcanoes located on the NW Pacific Plate are too tiny, less than 2 km in diameter, and yield eruption ages of various times during 0 to 9 Ma with three new data of Ar-Ar datings of 3.8, 6.2, and 9.2 Ma each (papers in preparation). The erupting time would be over the 0 to 10 Ma along the present plate motion, suggesting the episodic eruption of magma over a large eruption area but with low volumes of magma production. As some samples, however, are generally not used to be analyzed by sample-irradiated ArAr dating, this study adopted the U-Pb dating with the separation of zircons and apatites, awaiting for future dating results.
This study is reported by the oral presentation in JpGU 2014 Meeting, and the paper in Geochemical Journal (Hirano et al., 2013).

Report

(3 results)
  • 2013 Annual Research Report   Final Research Report ( PDF )
  • 2012 Research-status Report
  • Research Products

    (10 results)

All 2014 2013 2012

All Journal Article (3 results) (of which Peer Reviewed: 2 results) Presentation (7 results) (of which Invited: 1 results)

  • [Journal Article] Petit-spot lava fields off the central Chile trench induced by plate flexure2013

    • Author(s)
      Naoto Hirano, Shiki Machida, Natsue Abe, Tomoaki Morishita, Akihiro Tamura & Shoji Arai
    • Journal Title

      Geochemical Journal

      Volume: vol. 47 Pages: 249-257

    • NAID

      10031170205

    • Related Report
      2013 Final Research Report 2012 Research-status Report
    • Peer Reviewed
  • [Journal Article] Mantle structure below the petit-spot2013

    • Author(s)
      Naoto Hirano, Junji Yamamoto & Satoshi Okumura
    • Journal Title

      Mineralogical Magazine

      Volume: 77(5) Pages: 1302-1302

    • Related Report
      2013 Final Research Report
  • [Journal Article] Petit-spot lava fields off the central Chile trench induced by plate flexure2013

    • Author(s)
      Naoto Hirano, Shiki Machida, Natsue Abe, Tomoaki Morishita, Akihiro Tamura, Shoji Arai
    • Journal Title

      Geochemical Journal

      Volume: 47 Pages: 249-247

    • NAID

      10031170205

    • Related Report
      2013 Annual Research Report
    • Peer Reviewed
  • [Presentation] プチスポットの配列と海洋プレートの変形構造2014

    • Author(s)
      平野直人,中西正男
    • Organizer
      日本地球惑星科学連合2014年大会
    • Place of Presentation
      パシフィコ横浜,横浜(SCG67-06)
    • Year and Date
      2014-05-01
    • Related Report
      2013 Final Research Report
  • [Presentation] プチスポットの配列と海洋プレートの変形構造2014

    • Author(s)
      平野直人, 中西正男
    • Organizer
      日本地球惑星科学連合2014年大会
    • Place of Presentation
      パシフィコ横浜
    • Related Report
      2013 Annual Research Report
  • [Presentation] Mantle structure below the petit-spot2013

    • Author(s)
      Naoto Hirano, Junji Yamamoto & Satoshi Okumura
    • Organizer
      2013 Goldschmidt Conference
    • Place of Presentation
      Florence, Italy
    • Year and Date
      2013-08-27
    • Related Report
      2013 Final Research Report
  • [Presentation] フレンチポリネシア海域の海底火山探索2013

    • Author(s)
      平野直人,中西正男,阿部なつ江,町田嗣樹
    • Organizer
      日本地球惑星科学連合2013年大会
    • Place of Presentation
      幕張メッセ,千葉
    • Year and Date
      2013-05-22
    • Related Report
      2013 Final Research Report
  • [Presentation] チリ海溝のプチスポット火山2012

    • Author(s)
      平野直人,町田嗣樹,阿部なつ江,森下知晃,田村明弘,荒井章司
    • Organizer
      2012年度日本地球化学会年会
    • Place of Presentation
      九州大学箱崎キャンパス,博多
    • Year and Date
      2012-09-11
    • Related Report
      2013 Final Research Report
  • [Presentation] Role of volatiles on petit-spot volcanoes2012

    • Author(s)
      Naoto HIRANO, Satoshi OKUMURA
    • Organizer
      Japan Geoscience Uninon Meeting 2012
    • Place of Presentation
      Makuhari Messe
    • Related Report
      2012 Research-status Report
    • Invited
  • [Presentation] Carbon dioxide of petit-spot submarine volcanoes off Japan and Chile trenches2012

    • Author(s)
      Naoto HIRANO
    • Organizer
      2012 Annual Meeting, Geological Society of America
    • Place of Presentation
      Convention Center, Charlotte, North Carolina, USA
    • Related Report
      2012 Research-status Report

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Published: 2013-05-31   Modified: 2019-07-29  

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