• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to previous page

Triple in-situ analyses of zircon and baddeleyite in Archean mafic rocks to reveal early mantle evolution

Research Project

Project/Area Number 19K23458
Research Category

Grant-in-Aid for Research Activity Start-up

Allocation TypeMulti-year Fund
Review Section 0204:Astronomy, earth and planetary science, and related fields
Research InstitutionJapan Agency for Marine-Earth Science and Technology (2020)
The University of Tokyo (2019)

Principal Investigator

Sawada Hikaru  国立研究開発法人海洋研究開発機構, 超先鋭研究開発部門(超先鋭研究プログラム), Young Research Fellow (10845100)

Project Period (FY) 2019-08-30 – 2021-03-31
Project Status Completed (Fiscal Year 2020)
Budget Amount *help
¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
Fiscal Year 2020: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2019: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Keywordsジルコン / 地球化学 / 鉱物 / 岩石 / マントル / 微量元素 / ウラン鉛年代 / ハフニウム同位体比 / 地殻 / 苦鉄質岩 / バデレアイト / ICPMS
Outline of Research at the Start

西オーストラリア、アフリカ南部、北米およびグリーンランドなどに産する太古代苦鉄質岩中ジルコン(ZrSiO4)・バデレアイト(ZrO2)のウラン-鉛(U-Pb)年代・ハフニウム(Hf)同位体比・微量元素組成の3種の局所分析をLA-ICPMSを用いて行い、その結果から地球史初期における地殻-マントルの分化を具体的に制約する。

Outline of Final Research Achievements

Investments in facilities and equipment were made for the separation of zircon from the mafic rocks and its analysis. A custom-made aliquot was made for efficient heavy mineral separation. A binocular stereomicroscope and its accompanying equipment were purchased to enable efficient observation and separation of fine heavy minerals. Equipment and consumables necessary for making resin mounts of the separated zircon and polishing them were also purchased. Uranium-lead dating, trace element composition, and hafnium isotope ratios of the zircons by laser ablation inductively coupled plasma mass spectrometry were started up. Using these new equipment and methods, we separated zircons from rock samples in Japan and overseas and obtained analytical data. Some of the data have already been published as papers on peer-reviewed international journals.

Academic Significance and Societal Importance of the Research Achievements

地球は45億年前の誕生時から火成活動が続き、プレート沈み込みと共に大陸地殻生産の起きている太陽系でも特異に活動的な水-岩石惑星である。地球史初期のマントル組成進化と地殻生産量は、地球形成直後の内部構造やテクトニクスを解き明かす大きな手がかりであり、固体地球科学のみならず惑星形成論などの広い範囲に波及するが、地質記録に基づいた具体的な制約は難しく未だ研究途上である。本研究で着眼した苦鉄質岩中のジルコンの分析は、今後この課題解決のキーとなる可能性が高く、これまでの成果はその第1歩となるだろう。

Report

(3 results)
  • 2020 Annual Research Report   Final Research Report ( PDF )
  • 2019 Research-status Report
  • Research Products

    (6 results)

All 2021 2020 2019 Other

All Int'l Joint Research (1 results) Journal Article (4 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 4 results,  Open Access: 2 results) Presentation (1 results)

  • [Int'l Joint Research] University of Alberta(カナダ)

    • Related Report
      2019 Research-status Report
  • [Journal Article] New geochronological constraints on the middle Archean Shurugwi greenstone belt toward an understanding of the crustal evolution of the Zimbabwe Craton2021

    • Author(s)
      Sawada Hikaru、Sawaki Yusuke、Sakata Shuhei、Ishikawa Akira、Muteta Brian、Isozaki Yukio、Maruyama Shigenori
    • Journal Title

      Journal of African Earth Sciences

      Volume: 173 Pages: 104021-104021

    • DOI

      10.1016/j.jafrearsci.2020.104021

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Zircon U–Pb ages and whole–rock geochemistry from the Hida granites: implications for the geotectonic history and the origin of Mesozoic granites in the Hida belt, Japan2021

    • Author(s)
      YAMADA Raiki、SAWADA Hikaru、AOYAMA Shinnosuke、OUCHI Wataru、NIKI Sota、NAGATA Mitsuhiro、TAKAHASHI Toshiro、HIRATA Takafumi
    • Journal Title

      Journal of Mineralogical and Petrological Sciences

      Volume: 116 Issue: 1 Pages: 61-66

    • DOI

      10.2465/jmps.201125

    • NAID

      130007995354

    • ISSN
      1345-6296, 1349-3825
    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Fragments of the early Paleozoic orogenic belt from Tokyo Metropolis, Japan:2020

    • Author(s)
      Sawada Hikaru、Isozaki Yukio、Sakata Shuhei
    • Journal Title

      The Journal of the Geological Society of Japan

      Volume: 126 Issue: 10 Pages: 551-561

    • DOI

      10.5575/geosoc.2020.0026

    • NAID

      130007968387

    • ISSN
      0016-7630, 1349-9963
    • Year and Date
      2020-10-15
    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Estimation of Secular Change in the Size of Continents for Understanding Early Crustal Development2020

    • Author(s)
      Sawada Hikaru
    • Journal Title

      Frontiers in Earth Science

      Volume: 8 Pages: 505-505

    • DOI

      10.3389/feart.2020.541094

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access
  • [Presentation] 御荷鉾緑色岩類源岩のジュラ紀火成活動 -ジルコンU-Pb年代と微量元素組成から2019

    • Author(s)
      沢田 輝、磯崎 行雄、青木 翔吾、坂田 周平、長谷川 遼、中村 保夫
    • Organizer
      日本地球惑星科学連合大会
    • Related Report
      2019 Research-status Report

URL: 

Published: 2019-09-03   Modified: 2022-01-27  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi