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Ultra-high precision Sr isotope analysis for Sr isotope stratigraphy of quaternary samples

Research Project

Project/Area Number 18K03814
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 17040:Solid earth sciences-related
Research InstitutionJapan Agency for Marine-Earth Science and Technology

Principal Investigator

WAKAKI Shigeyuki  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(高知コア研究所), 研究員 (50548188)

Co-Investigator(Kenkyū-buntansha) 若木 仁美  高知大学, 海洋コア総合研究センター, 短期研究員 (20817043)
高柳 栄子  東北大学, 理学研究科, 助教 (40729208)
吉村 寿紘  国立研究開発法人海洋研究開発機構, 海洋機能利用部門(生物地球化学プログラム), 研究員 (90710070)
Project Period (FY) 2018-04-01 – 2021-03-31
Project Status Completed (Fiscal Year 2020)
Budget Amount *help
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2020: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2019: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2018: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Keywordsストロンチウム同位体層序 / 第四紀 / 堆積年代決定 / 高精度同位体分析 / 海洋底掘削コア / 放射起源Sr同位体比 / Sr同位体層序 / 質量分析 / 同位体比質量分析 / Sr同位体比 / 同位体分析
Outline of Final Research Achievements

Sr isotope stratigraphy is widely used to determine sedimentation ages of marine sediments and carbonates. However, dating of quaternary samples by this method was difficult so far because the precision of the 87Sr/86Sr ratio measurement was insufficient to distinguish the very small 87Sr/86Sr variation of the seawater during this period. To resolve this technical bottleneck problem, we developed method for an ultra-high precision analysis of 87Sr/86Sr ratio using dynamic-multicollection thermal ionization mass spectrometry. The long-term analytical reproducibility of 87Sr/86Sr ratio achieved in this study was 2 ppm (2RSD). This analytical precision is sufficient to discriminate between 100 ky cycle of glacial-interglacial periods of the quaternary era. Analysis of foraminifera samples separated from oceanic drilling cores suggested that the current seawater Sr isotopic evolution curve may contain very small systematic errors in the quaternary part.

Academic Significance and Societal Importance of the Research Achievements

本研究ではSr同位体層序を用いた第四紀の不連続な地層に対する年代決定の実現に向けた技術的革新を達成した。近年、国際深海科学掘削計画(IODP)で多くの掘削が行われているアクティブなプレート収束帯では、海洋底堆積物に大小様々の断層など地殻変動に由来する不整合が普遍的に存在する。今後Sr同位体層序を用いた第四紀の堆積年代決定が実現すれば、断層などの存在による堆積物の不連続性を証明する強力なツールとして、変動地形の活動度評価など地殻変動・防災に関する研究にも応用が期待される

Report

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

    (14 results)

All 2021 2020 2019 2018

All Journal Article (5 results) (of which Int'l Joint Research: 2 results,  Peer Reviewed: 5 results,  Open Access: 5 results) Presentation (9 results) (of which Int'l Joint Research: 3 results,  Invited: 1 results)

  • [Journal Article] Stable strontium isotopic compositions of river water, groundwater, and sediments from the Ganges, Brahmaputra and Meghna river system in Bangladesh2021

    • Author(s)
      Yoshimura, T., Wakaki, S., Kawahata, H., Hossain, Z., Manaka, T., Suzuki, A., Ishikawa, T. and Ohkouchi, N.
    • Journal Title

      Frontiers in Earth Science,

      Volume: 9 Pages: 1-17

    • DOI

      10.3389/feart.2021.592062

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] A Systematic Assessment of Stable Sr Isotopic Compositions of Vent Fluids in Arc/Back-Arc Hydrothermal Systems: Effects of Host Rock Type, Phase Separation, and Overlying Sediment2020

    • Author(s)
      Yoshimura Toshihiro、Wakaki Shigeyuki、Ishikawa Tsuyoshi、Gamo Toshitaka、Araoka Daisuke、Ohkouchi Naohiko、Kawahata Hodaka
    • Journal Title

      Frontiers in Earth Science

      Volume: 8 Pages: 591711-591711

    • DOI

      10.3389/feart.2020.591711

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Isotope Dilution-Total Evaporation-Thermal Ionization Mass Spectrometric Direct Determination of Radioactive Strontium-90 in Microdrop Samples2020

    • Author(s)
      Ito Chihiro、Shimode Ryoya、Miyazaki Takashi、Wakaki Shigeyuki、Suzuki Katsuhiko、Takagai Yoshitaka
    • Journal Title

      Analytical Chemistry

      Volume: 92 Issue: 24 Pages: 16058-16065

    • DOI

      10.1021/acs.analchem.0c03673

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] EFFECT OF CRYSTALLINITY OF APATITE IN CREMATED BONE ON CARBON EXCHANGES DURING BURIAL AND RELIABILITY OF RADIOCARBON DATING2019

    • Author(s)
      Minami M., Mukumoto H., Wakaki S., and Nakamura T.
    • Journal Title

      Radiocarbon

      Volume: 61 Issue: 6 Pages: 1823-1834

    • DOI

      10.1017/rdc.2019.97

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Sequential chemical separation of Sr, Nd and Pb from geological samples using multi-step extraction column chromatography2018

    • Author(s)
      若木重行、川合達也、永石一弥、石川剛志
    • Journal Title

      JAMSTEC Report of Research and Development

      Volume: 27 Issue: 0 Pages: 1-12

    • DOI

      10.5918/jamstecr.27.1

    • NAID

      130007506144

    • ISSN
      1880-1153, 2186-358X
    • Year and Date
      2018-09-01
    • Related Report
      2018 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] ベンガル平野の河川水、地下水および堆積物のストロンチウム安定同位体組成2020

    • Author(s)
      吉村 寿紘,若木 重行,川幡 穂高,Zakir Hossain,眞中 卓也,鈴木 淳,石川 剛志,大河内 直彦
    • Organizer
      日本地球化学会第67回年会
    • Related Report
      2020 Annual Research Report
  • [Presentation] Rb-Sr放射改変系の微少量分析による出土琥珀産地推定の試み2020

    • Author(s)
      若木重行、谷水雅治、植田直見
    • Organizer
      日本地球化学会第67回年会
    • Related Report
      2020 Annual Research Report
  • [Presentation] High precision analysis of radiogenic Sr isotope ratios of modern and quaternary oceans2019

    • Author(s)
      Wakaki S., Yoshimura T., Takayanagi H., and Wakaki H.
    • Organizer
      Goldschmidt conference 2019
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] ダブルスパイク-TIMS法を用いたSr安定同位体の高精度分析とその地球化学・考古科学への応用2019

    • Author(s)
      若木重行
    • Organizer
      第9回同位体環境学シンポジウム
    • Related Report
      2019 Research-status Report
    • Invited
  • [Presentation] Response of structurally substituted sulfur in foraminifera shells to glacial-interglacial changes: a 1.0-million-year record from the Ontong-Java Plateau2019

    • Author(s)
      吉村寿紘、為則雄祐、黒田潤一郎、黒柳あずみ、大河内 直彦
    • Organizer
      日本地球惑星科学連合2019年大会
    • Related Report
      2019 Research-status Report
  • [Presentation] Precise and accurate analysis of stable Sr isotope ratios by DS-TIMS and its application to paleoenvironmental studies2018

    • Author(s)
      SHIGEYUKI WAKAKI, HAJIME OBATA, HIROFUMI TAZOE AND TSUYOSHI ISHIKAWA
    • Organizer
      Goldschmidt conference
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] 第四紀Sr同位体層序の精密化を目的とした放射起源Sr同位体比の超高精度分析2018

    • Author(s)
      若木重行、吉村寿紘、高柳栄子、若木仁美
    • Organizer
      2018年度 日本地球化学会年会
    • Related Report
      2018 Research-status Report
  • [Presentation] ネオジム同位体比による第四紀古環境復元の新たな展開2018

    • Author(s)
      高柳栄子・若木重行・石川剛志・井龍康文
    • Organizer
      日本第四紀学会2018年大会
    • Related Report
      2018 Research-status Report
  • [Presentation] High precision radiogenic Sr isotope analyisis by TIMS - error sources and limitations2018

    • Author(s)
      Shigeyuki Wakaki, Toshihiro Yoshimura, Hideko Takayanagi, Hitomi Wakaki
    • Organizer
      3rd Korea-Japan Joint Workshop on Isotope-Ratio Mass Spectrometry
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research

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

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