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Decording impact history in the early Earth

Research Project

Project/Area Number 15K20935
Research Category

Grant-in-Aid for Young Scientists (B)

Allocation TypeMulti-year Fund
Research Field Geology
Petrology/Mineralogy/Economic geology
Research InstitutionYokohama National University

Principal Investigator

Yamamoto Shinji  横浜国立大学, 大学院環境情報研究院, 准教授 (30467013)

Research Collaborator KOMIYA Tsuyoshi  
ISOZAKI Yikio  
SAKATA Shuhei  
Project Period (FY) 2015-04-01 – 2018-03-31
Project Status Completed (Fiscal Year 2017)
Budget Amount *help
¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2017: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2016: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2015: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
Keywords初期地球 / ジャックヒルズ / 砕屑性ジルコン / 衝撃変成作用 / 後期重爆撃 / 隕石衝突 / 衝撃変成ジルコン / インパクト年代 / ジルコン
Outline of Final Research Achievements

Our research proposal aimed to resolve “Late Heavy Bombardment (LHB) hypothesis” originally proposed from studies of the Moon, using detrital shocked-zircon in the metasedimentary rock, western Australia. Hugh amount of zircon separation and high-reliability age dating techniques are developed and the results are published in international journals, respectively. Related topics about the early Earth environment, we present oral presentation (invited) at international and domestic conferences.
Main research finding in our proposal is below; four types of shock-metamorphosed zircons were identified; (1) curvi-planar (non-planar) feature, (2) multiple sets of planar feature, (3) partly granular (polycrystalline) texture, and (4) fully granular texture. Of these four, multiple sets of planar feature are proved for diagnostic evidence for impact origin, and now observed as annealed (decorated) planar feature, probably due to post-impact thermal heating or regional metamorphic overprint.

Report

(4 results)
  • 2017 Annual Research Report   Final Research Report ( PDF )
  • 2016 Research-status Report
  • 2015 Research-status Report
  • Research Products

    (11 results)

All 2018 2017 2016 2015

All Journal Article (3 results) (of which Int'l Joint Research: 3 results,  Peer Reviewed: 3 results,  Open Access: 3 results) Presentation (8 results) (of which Int'l Joint Research: 2 results,  Invited: 2 results)

  • [Journal Article] Supra-subduction igneous formations of the Char ophiolite belt, East Kazakhstan2018

    • Author(s)
      Sofanova, I., Komiya, T., Romer, R.L., Simonov, V., Seltmann, R., Rudnev, S.N., Yamamoto, S. and Sun, M.
    • Journal Title

      Gondwana Research

      Volume: 59 Pages: 159-179

    • DOI

      10.1016/j.gr.2018.04.001

    • Related Report
      2017 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] High-reliability zircon separation for hunting the oldest material on Earth: An automatic zircon separator with image-processing/microtweezers-manipulating system and double-step dating2017

    • Author(s)
      Yukio Isozaki, Shinji Yamamoto, Shuhei Sakata, Hideyuki Obayashi, Takafumi Hirata, Ken-ichi Obori, Toshinori Maebayashi, Satoshi Takeshima, Toshikazu Ebisuzaki, Shigenori Maruyama
    • Journal Title

      Geoscience Frontiers

      Volume: 4 Issue: 4 Pages: 1-11

    • DOI

      10.1016/j.gsf.2017.04.010

    • NAID

      120006630980

    • Related Report
      2017 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Geology of the Eoarchean, >3.95 Ga, Nulliak supracrustal rocks in the Saglek Block, northern Labrador, Canada: The oldest geological evidence for plate tectonics2015

    • Author(s)
      Komiya, T., Yamamoto, S., Aoki, S., Sawaki, Y., Ishikawa, A., Tashiro, T., Koshida, K., Shimojo, M., Aoki, K., Collerson, K.
    • Journal Title

      Tectonophysics

      Volume: 662 Pages: 40-66

    • DOI

      10.1016/j.tecto.2015.05.003

    • Related Report
      2015 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Presentation] 地球最古岩石および鉱物から推定する 初期地球環境: レーザー技術を用いた微小領域分析2018

    • Author(s)
      山本伸次
    • Organizer
      レーザー学会学術講演会第39回年次大会
    • Related Report
      2017 Annual Research Report
    • Invited
  • [Presentation] Hadean environment inferred from mineral inclusions in the oldest zircon of the Earth2017

    • Author(s)
      S. Yamamoto, S. Sakata, H. Ohbayashi, T. Hirata, and T. Komiya
    • Organizer
      Laser Solutions for Space and the Earth
    • Related Report
      2017 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] 砕屑性衝撃変成ジルコンの組織学的検討2017

    • Author(s)
      山本伸次
    • Organizer
      日本地質学会2017年愛媛大会
    • Related Report
      2017 Annual Research Report
  • [Presentation] Shock-metamorphosed zircons discovered from the Jack Hills metaconglomerate in the Narryer Gneiss Complex, W. Australia2016

    • Author(s)
      Shinji Yamamoto
    • Organizer
      2016 Goldschmidt Conference
    • Place of Presentation
      Pacifico Yokohama
    • Year and Date
      2016-06-29
    • Related Report
      2016 Research-status Report
    • Int'l Joint Research
  • [Presentation] 冥王代ジルコン研究 ~ジルコン100万粒計画~2016

    • Author(s)
      山本伸次
    • Organizer
      2016年地球惑星科学連合大会
    • Place of Presentation
      幕張メッセ
    • Year and Date
      2016-05-25
    • Related Report
      2016 Research-status Report
  • [Presentation] 初期太古代ジルコンのU-Pb年代とそこに含まれる包有物の40Ar-39Ar年代2015

    • Author(s)
      山本伸次1、小宮 剛1、越田渓子1、兵藤博信2、佐藤佳子3、熊谷英憲3、渋谷岳造3、下條将徳4、坂田周平5、平田岳史
    • Organizer
      2015年度日本地球化学会年会
    • Place of Presentation
      横浜国立大学(神奈川)
    • Year and Date
      2015-09-16
    • Related Report
      2015 Research-status Report
  • [Presentation] Shock-metamorphosed zircons recovered from the Jack Hills metaconglomerates in the Narryer Gneiss Complex, Western Australia2015

    • Author(s)
      山本伸次・小宮剛・飯塚剛・渋谷岳造・Kenneth Collerson
    • Organizer
      日本地質学会第122年学術大会
    • Place of Presentation
      信州大学(長野)
    • Year and Date
      2015-09-13
    • Related Report
      2015 Research-status Report
  • [Presentation] Shock-metamorphosed zircons from the Jack Hills metaconglomerate in the Narryer Gneiss Complex, Western Australia: Significant clue for the terrestrial bombardment in the early Earth2015

    • Author(s)
      山本伸次、小宮剛
    • Organizer
      日本地球惑星連合大会
    • Place of Presentation
      幕張メッセ(千葉)
    • Year and Date
      2015-05-28
    • Related Report
      2015 Research-status Report

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Published: 2015-04-16   Modified: 2019-03-29  

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