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Ca isotopic compositions of chondrules: Implication for early evolution of planetary material

Research Project

Project/Area Number 15H03754
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Geochemistry/Cosmochemistry
Research InstitutionNational Institute of Polar Research

Principal Investigator

Misawa Keiji  国立極地研究所, 研究教育系, 准教授 (70212230)

Co-Investigator(Kenkyū-buntansha) 横山 立憲  国立研究開発法人日本原子力研究開発機構, バックエンド研究開発部門 東濃地科学センター, 研究職 (10750846)
新原 隆史  東京大学, 総合研究博物館, 特任助教 (20733679)
米田 成一  独立行政法人国立科学博物館, 理工学研究部, グループ長 (60210788)
海田 博司  国立極地研究所, 研究教育系, 助教 (10302811)
Project Period (FY) 2015-04-01 – 2018-03-31
Project Status Completed (Fiscal Year 2017)
Budget Amount *help
¥12,350,000 (Direct Cost: ¥9,500,000、Indirect Cost: ¥2,850,000)
Fiscal Year 2017: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
Fiscal Year 2016: ¥3,380,000 (Direct Cost: ¥2,600,000、Indirect Cost: ¥780,000)
Fiscal Year 2015: ¥6,110,000 (Direct Cost: ¥4,700,000、Indirect Cost: ¥1,410,000)
Keywordsコンドリュール / カルシウム / ストロンチウム / バリウム / 同位体 / コンドライト / ダブルスパイク / 安定同位体 / アルカリ土類
Outline of Final Research Achievements

Chondrules are main constituent of chondritic meteorites and thus, they have preserved chemical and isotopic fractionations which occurred in the early solar system. To better understand whether there is a contribution of pre-solar materials in chondrule precursors, we have tried to determine calcium isotopic compositions of individual chondrules.
We finally established chemical separation and analytical methods of calcium, strontium and barium, which can be applied to planetary materials. Using the thermal ionization mass spectrometer installed at Kumamoto University, barred-olivine chondrules in the Allende CV3 chondrite were analyzed for calcium isotope. As a result, no clear isotope fractionation (excess or deficiency of Ca-48) was observed, indicating a contribution of the pre-solar material to the chondrule precursors was limited.

Report

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

    (7 results)

All 2017 2016 2015

All Journal Article (2 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 2 results,  Acknowledgement Compliant: 1 results) Presentation (5 results) (of which Int'l Joint Research: 3 results)

  • [Journal Article] Extreme early solar system chemical fractionation recorded by alkali-rich clasts contained in ordinary chondrite breccias2017

    • Author(s)
      Yokoyama T., Misawa K., Okano O., Shih C.-Y., Nyquist L.E., Simon J.I., Tappa M.J., Yoneda S
    • Journal Title

      Earth Planet. Sci. Lett.

      Volume: 458 Pages: 233-240

    • DOI

      10.1016/j.epsl.2016.10.037

    • Related Report
      2016 Annual Research Report
    • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
  • [Journal Article] Photostimulated luminescence applicable to pre-screening of potassium-rich phases in chondritic breccias2016

    • Author(s)
      Tatsunori Yokoyama, Keiji Misawa, Osamu Okano, Haruka Minowa, Takaaki Fukuoka
    • Journal Title

      Journal of Radioanalytical and Nuclear Chemistry

      Volume: 309 Issue: 1 Pages: 81-89

    • DOI

      10.1007/s10967-016-4846-x

    • Related Report
      2016 Annual Research Report 2015 Annual Research Report
    • Peer Reviewed
  • [Presentation] Stable and radiogenic strontium isotope variation (δ88Sr, 87Sr/86Sr) in Middle-Upper Permian mid-oceanic paleo-atoll carbonates2017

    • Author(s)
      Kani T., Isozaki Y., Misawa K., Yoneda S.
    • Organizer
      JpGU-AGU Joint Meeting 2017
    • Related Report
      2017 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 惑星物質のカルシウム同位体進化2016

    • Author(s)
      三澤 啓司, 横山 立憲, 米田 成一
    • Organizer
      2016年度日本地球化学会年会
    • Place of Presentation
      大阪市立大学 杉本町 大阪
    • Year and Date
      2016-09-16
    • Related Report
      2016 Annual Research Report
  • [Presentation] Petrology and mineralogy of an igneous clast in Northwest Africa 1685: Comparison with alkali-rich igneous rock fragments in Yamato-744422016

    • Author(s)
      Niihara T., Misawa K,. Yokoyama T.
    • Organizer
      47th Lunar Planetary Science Conference
    • Place of Presentation
      Woodlands, Texas, USA
    • Year and Date
      2016-03-22
    • Related Report
      2015 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Barium isotopic compositions of ordinary chondrites2015

    • Author(s)
      Misawa K., Yokoyama T., Yoneda S.
    • Organizer
      6th Symposium on Polar Science
    • Place of Presentation
      国立国語研究所, 立川, 東京
    • Year and Date
      2015-11-17
    • Related Report
      2015 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 普通コンドライト隕石のバリウム同位体組成2015

    • Author(s)
      三澤 啓司, 横山 立憲, 米田 成一
    • Organizer
      2015年度日本地球化学会年会
    • Place of Presentation
      横浜国立大学, 横浜, 神奈川
    • Year and Date
      2015-09-18
    • Related Report
      2015 Annual Research Report

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

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