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Deciphering the evolution history of volatile elements toward the formation of the water-planet, recorded in lunar potassium feldspar

Research Project

Project/Area Number 17H02992
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Geochemistry/Cosmochemistry
Research InstitutionIbaraki University

Principal Investigator

Hashizume Ko  茨城大学, 理工学研究科(理学野), 教授 (90252577)

Co-Investigator(Kenkyū-buntansha) 山中 千博  大阪大学, 理学研究科, 准教授 (10230509)
藤谷 渉  茨城大学, 理工学研究科(理学野), 准教授 (20755615)
掛川 武  東北大学, 理学研究科, 教授 (60250669)
Project Period (FY) 2017-04-01 – 2020-03-31
Project Status Completed (Fiscal Year 2020)
Budget Amount *help
¥17,290,000 (Direct Cost: ¥13,300,000、Indirect Cost: ¥3,990,000)
Fiscal Year 2019: ¥5,330,000 (Direct Cost: ¥4,100,000、Indirect Cost: ¥1,230,000)
Fiscal Year 2018: ¥5,330,000 (Direct Cost: ¥4,100,000、Indirect Cost: ¥1,230,000)
Fiscal Year 2017: ¥6,630,000 (Direct Cost: ¥5,100,000、Indirect Cost: ¥1,530,000)
Keywords月岩石 / 揮発性元素 / アンモニア / イオン照射 / SIMS分析 / 月 / カリ長石 / SIMS / 月隕石 / 起源 / イオンインプランテーション / 岩石圏 / 窒素同位体 / 微小領域分析 / 炭素イオン
Outline of Final Research Achievements

This project aims at deciphering the origin of nitrogen trapped in Moon rocks. A novel ion-microprobe analytical technique that enables detection of ammonium-form nitrogen concentrated in potassium-bearing minerals was developed. To enhance the detection sensitivity of nitrogen, carbon ions were implanted to the rock minerals. A high gain of cyanide ions was confirmed from terrestrial potassium-feldspars with known nitrogen concentrations. Compatible nitrogen ion intensities were confirmed in potassium-feldspar from lunar meteorites. We estimate nitrogen concentration of approximately 100 ppm in this specific mineral, which is much higher than the bulk concentration of nitrogen, generally of the order of 1 ppm.

Academic Significance and Societal Importance of the Research Achievements

月岩石中に含まれる窒素を始めとした揮発性元素の起源と進化の理解は、月だけではなく地球の揮発性元素の様子、ひいては、地球が水惑星となった過程を正しく把握するための鍵だと目されている。今回、微小な造岩鉱物に濃集した窒素の起源を紐解くための基礎技術の開発に成功し、月岩石中の揮発性元素の起源を紐解く新たな突破口が確立された。

Report

(4 results)
  • 2020 Final Research Report ( PDF )
  • 2019 Annual Research Report
  • 2018 Annual Research Report
  • 2017 Annual Research Report
  • Research Products

    (8 results)

All 2020 2019 2018 2017

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

  • [Journal Article] Carbon isotopic evolution of aqueous fluids in CM chondrites: Clues from in-situ isotope analyses within calcite grains in Yamato-7911982020

    • Author(s)
      Fujiya Wataru、Aoki Yuto、Ushikubo Takayuki、Hashizume Ko、Yamaguchi Akira
    • Journal Title

      Geochimica et Cosmochimica Acta

      Volume: 274 Pages: 246-260

    • DOI

      10.1016/j.gca.2020.02.003

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] 月面に供給される揮発性物質とその起源2019

    • Author(s)
      橋爪 光
    • Journal Title

      日本惑星科学会誌遊星人

      Volume: 28 Pages: 6-13

    • NAID

      130007691183

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed
  • [Journal Article] 月内部に存在する揮発性成分2019

    • Author(s)
      鹿山雅裕, 橋爪 光
    • Journal Title

      日本惑星科学会誌遊星人

      Volume: 28 Pages: 24-33

    • NAID

      130007691185

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Microbial nitrogen cycle enhanced by continental input recorded in the Gunflint Formation2017

    • Author(s)
      Ishida A., Hashizume K., and Kakegawa T.
    • Journal Title

      Geoch. Perspec. Letters

      Volume: 4 Pages: 13-18

    • DOI

      10.7185/geochemlet.1729

    • Related Report
      2017 Annual Research Report
    • Peer Reviewed / Open Access
  • [Presentation] 窒素・炭素の親鉄性 - コンドライト隕石と地球組成の差を読み解く鍵2020

    • Author(s)
      橋爪 光
    • Organizer
      日本地球惑星科学連合2020年大会
    • Related Report
      2019 Annual Research Report
  • [Presentation] Supplies and Storage of Volatiles on Moon2018

    • Author(s)
      HASHIZUME, K
    • Organizer
      New Views of the Moon 2
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 月の科学探査意義2018

    • Author(s)
      橋爪 光
    • Organizer
      第62回宇宙科学技術連合講演会
    • Related Report
      2018 Annual Research Report
  • [Presentation] 月の水2018

    • Author(s)
      橋爪 光
    • Organizer
      第19回惑星圏研究会
    • Related Report
      2017 Annual Research Report
    • Invited

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Published: 2017-04-28   Modified: 2022-01-27  

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