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

Synthesizing reference materials for U-Pb dating: A contribution to development of geochronology

Research Project

Project/Area Number 18K18780
Research Category

Grant-in-Aid for Challenging Research (Exploratory)

Allocation TypeMulti-year Fund
Review Section Medium-sized Section 17:Earth and planetary science and related fields
Research InstitutionThe University of Tokyo

Principal Investigator

Kagi Hiroyuki  東京大学, 大学院理学系研究科(理学部), 教授 (70233666)

Co-Investigator(Kenkyū-buntansha) 平田 岳史  東京大学, 大学院理学系研究科(理学部), 教授 (10251612)
折橋 裕二  弘前大学, 理工学研究科, 教授 (70313046)
宮嶋 佑典  東京大学, 大学院理学系研究科(理学部), 特別研究員 (60826056)
Project Period (FY) 2018-06-29 – 2021-03-31
Project Status Completed (Fiscal Year 2020)
Budget Amount *help
¥6,370,000 (Direct Cost: ¥4,900,000、Indirect Cost: ¥1,470,000)
Fiscal Year 2019: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Fiscal Year 2018: ¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
KeywordsU-Pb年代測定 / カルサイト / 非晶質炭酸カルシウム / アモルファス炭酸カルシウム / U-Pb年代測定法 / 炭酸カルシウム / 標準試料
Outline of Final Research Achievements

The U-Pb dating method can be applied to a very wide age range from 4.6 billion years ago to the recent 100,000 years. In this study, we focused on calcium carbonate, which exists universally on the earth. We clarified that U and Pb can be introduced into the crystal structure of calcium carbonate (calcite) by incorporating U and Pb at arbitrary concentrations into amorphous calcium carbonate and rapidly growing the crystals under high temperature. Furthermore, by incorporating trace elements such as rare earth elements in the same way as U and Pb, it was possible to prepare standard samples of various trace elements. The results obtained in this study can be widely used for the dating of carbonate rocks by laser ablation ICP mass spectrometry.

Academic Significance and Societal Importance of the Research Achievements

本研究の成果は、地球上に普遍的に存在する炭酸カルシウムの年代測定を広い年代範囲で、そして高い精度で実現すること寄与するだろう。炭酸カルシウムは代表的なバイオミネラルであるため、化石試料などの年代測定にもつながり、生物の進化 などの研究にも大きな発展をもたらすことになるだろう。一方、今回の研究成果は、従来は取り込まれにくい元素を炭酸カルシウムの結晶構造に取り込ませることを実現したことになるので、新たな材料開発や物質合成への道を開いたとも言える。

Report

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

    (9 results)

All 2020 2019 2018

All Journal Article (4 results) (of which Int'l Joint Research: 2 results,  Peer Reviewed: 4 results,  Open Access: 3 results) Presentation (5 results) (of which Int'l Joint Research: 1 results)

  • [Journal Article] Incorporation of U, Pb and Rare Earth Elements in Calcite through Crystallisation from Amorphous Calcium Carbonate: Simple Preparation of Reference Materials for Microanalysis2020

    • Author(s)
      Miyajima Yusuke、Saito Ayaka、Kagi Hiroyuki、Yokoyama Tatsunori、Takahashi Yoshio、Hirata Takafumi
    • Journal Title

      Geostandards and Geoanalytical Research

      Volume: 45 Issue: 1 Pages: 189-205

    • DOI

      10.1111/ggr.12367

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Incorporation of Incompatible Strontium and Barium Ions into Calcite (CaCO3) through Amorphous Calcium Carbonate2020

    • Author(s)
      Saito Ayaka、Kagi Hiroyuki、Marugata Shiho、Komatsu Kazuki、Enomoto Daisuke、Maruyama Koji、Kawano Jun
    • Journal Title

      Minerals

      Volume: 10 Issue: 3 Pages: 270-270

    • DOI

      10.3390/min10030270

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] High-pressure responses of alkali metal hydrogen carbonates, RbHCO3 and CsHCO3: Findings of new phases and unique compressional behavior2020

    • Author(s)
      Iizuka-Oku Riko、Gui Weibin、Komatsu Kazuki、Yagi Takehiko、Kagi Hiroyuki
    • Journal Title

      Journal of Solid State Chemistry

      Volume: 283 Pages: 121139-121139

    • DOI

      10.1016/j.jssc.2019.121139

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Deformation Features of Super-Deep Diamonds2019

    • Author(s)
      Ragozin Alexey、Zedgenizov Dmitry、Shatsky Vladislav、Kuper Konstantin、Kagi Hiroyuki
    • Journal Title

      Minerals

      Volume: 10 Issue: 1 Pages: 18-18

    • DOI

      10.3390/min10010018

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Presentation] 非晶質炭酸カルシウムの結晶化による局所U-Pb年代測定のための標準カルサイトの合成2019

    • Author(s)
      宮嶋 佑典、斉藤 綾花、鍵 裕之、横山 立憲、平田 岳史
    • Organizer
      日本地球惑星科学連合2019年大会
    • Related Report
      2019 Research-status Report
  • [Presentation] カルサイト構造をもつ(Ba,Ca)CO3の合成と炭酸イオンの特異な挙動2019

    • Author(s)
      鍵 裕之, 斉藤 綾花, 小松 一生, 丸形 詩歩, 川野 潤
    • Organizer
      2019年度 日本地球化学会 年会
    • Related Report
      2019 Research-status Report
  • [Presentation] Synthesis of U and Pb-Doped Calcite: A Novel Reference Material for in situ U-Pb Dating of Carbonates2019

    • Author(s)
      Miyajima Y., Saito A., Kagi H., Yokoyama T., Hirata T., Roberts N. ans Horstwood M.
    • Organizer
      Goldschmidt Conference
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] 非晶質炭酸カルシウムの結晶化による局所U, Pb年代測定のための標準カルサイトの合成2019

    • Author(s)
      宮嶋 佑典, 斉藤 綾花, 鍵 裕之, 横山 立憲, 平田 岳史
    • Organizer
      日本地球惑星科学連合 2019年大会
    • Related Report
      2018 Research-status Report
  • [Presentation] 炭酸塩U-Pb年代測定に向けたカルサイト標準物質の合成と均質性評価2018

    • Author(s)
      宮嶋 佑典, 斉藤 綾花, 鍵 裕之, 横山 立憲, 平田 岳史
    • Organizer
      2018年度日本地球化学会 年会
    • Related Report
      2018 Research-status Report

URL: 

Published: 2018-07-25   Modified: 2022-01-27  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi