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Unveiling life-building materials on the early-Earth by analyzing organic materials in Antarctic micrometeorites

Research Project

Project/Area Number 18K03830
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 17050:Biogeosciences-related
Research InstitutionJapan Aerospace EXploration Agency

Principal Investigator

Yada Toru  国立研究開発法人宇宙航空研究開発機構, 宇宙科学研究所, 主任研究開発員 (00294877)

Co-Investigator(Kenkyū-buntansha) 奈良岡 浩  九州大学, 理学研究院, 教授 (20198386)
Project Period (FY) 2018-04-01 – 2021-03-31
Project Status Completed (Fiscal Year 2020)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2020: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2019: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2018: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
Keywords生命材料物質 / 原始地球 / 微隕石 / 氷昇華システム / DESI-Orbitrap MS / 顕微FT-IR / レーザーラマン分光 / 惑星感塵 / 南極微隕石 / 有機物 / 生命起源物質 / 南極雪氷 / 宇宙塵 / 脱離エレクトロスプレーイオン化軌道捕獲型質量分析 / 顕微フーリエ変換赤外分光分析 / 顕微レーザーラマン分光分析 / 可溶性有機物 / 顕微レーザーラマン分光
Outline of Final Research Achievements

We established a new method to extract micrometeorites (MMs), which are estimated to be possible sources of life-building materials in the ancient Earth, without exposing to liquid water and analyze their soluble organic matters. Using this method, we found four MMs candidates from 3kg of Antarctic ice and snow and analyze their soluble and insoluble organic matters. As a result, they should have experienced relatively high temperature compared to carbonaceous chondrites like Murchison, indicating heating during their atmospheric entry. However, we could not identify any indigenous soluble organic matter from them, probably due to eluviation of soluble organic matters caused by deliquescence of attached aerosols during residence in snow and/or ice, or laboratory environment.

Academic Significance and Societal Importance of the Research Achievements

本研究により、原始地球の生命材料物質の供給源と目される微隕石から可溶性有機物を損なわずに分離し、その分析を行う事で、原始地球の前駆生命環境を明らかにする為の研究手法を確立した。残念ながら、今回の研究ではその解明までは到らなかったが、今回確立した手法を用い、更に問題となったエアロゾルの潮解による可溶性有機物の溶脱への対処手法を開発し、更に多くの南極雪氷からの微粒子の分離・微隕石候補粒子の分析を継続する事により、今後、原始地球の前駆生命環境を明らかにされる事が期待される。

Report

(4 results)
  • 2020 Annual Research Report   Final Research Report ( PDF )
  • 2019 Research-status Report
  • 2018 Research-status Report
  • Research Products

    (3 results)

All 2019

All Presentation (3 results) (of which Int'l Joint Research: 2 results)

  • [Presentation] 南極氷中に含まれる可溶性有機物の検出のための氷昇華手法の確立2019

    • Author(s)
      石川裕偉、山本康太、橋口美奈子、奈良岡浩、矢田達、岡田達明
    • Organizer
      日本地球惑星科学連合2019年大会
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] Detection of Soluble Organic Matter in Antarctic Micrometeorites2019

    • Author(s)
      Yui Ishikawa, Kota Yamamoto, Minako Hashiguchi, Hiroshi Naraoka, Toru Yada and Tatsuaki Okada
    • Organizer
      The Tenth Symposium on Polar Science
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] 南極氷中に含まれる可溶性有機物の検出のための氷昇華手法の確立2019

    • Author(s)
      石川裕偉、山本康太、奈良岡浩、矢田達、岡田達明
    • Organizer
      2019年地球惑星科学連合大会
    • Related Report
      2018 Research-status Report

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Published: 2018-04-23   Modified: 2022-01-27  

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