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Hf-W Isotopic Systematics : Constraints for Geochemical Evolution of the Planet Earth

Research Project

Project/Area Number 15340191
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Geochemistry/Astrochemistry
Research InstitutionTokyo Institute of Technology

Principal Investigator

HIRATA Takafumi  Tokyo Institute of Technology, Dept.of Earth and Planet.Sci., Associate Prof., 大学院・理工学研究科, 助教授 (10251612)

Co-Investigator(Kenkyū-buntansha) IDA Shigeru  Tokyo Institute of Technology, Dept.of Earth and Planet.Sci., Prof., 大学院・理工学研究科, 教授 (60211736)
EMORI Hiroki  Tokyo Institute of Technology, Dept.of Earth and Planet.Sci., Ressarch Associate, 大学院・理工学研究科, 助手 (30262257)
Project Period (FY) 2003 – 2005
Project Status Completed (Fiscal Year 2005)
Budget Amount *help
¥14,000,000 (Direct Cost: ¥14,000,000)
Fiscal Year 2005: ¥2,500,000 (Direct Cost: ¥2,500,000)
Fiscal Year 2004: ¥5,200,000 (Direct Cost: ¥5,200,000)
Fiscal Year 2003: ¥6,300,000 (Direct Cost: ¥6,300,000)
KeywordsW isotopes / Hf-W chronometer / geochemical samples / ion chromatography / ICP-mass spectrometry / stable isotope geochemistry / isotopic fractionation / oxidation-reduction reaction / イオンクロマトグラフィー / 地球形成 / 金属コア形成 / 放射年代測定法 / 超微量元素分析 / 同位体分析 / 質量分析法 / 数値シミュレーション / 同位体分析法 / 超高圧変成帯 / タングステン濃度 / 物質大循環 / 地球内部構造進化 / ハワイ海洋島玄武岩
Research Abstract

Hf-W isotopic systematics has been given great attention in the field of Earth sciences because of its high time resolution to the cosmochemical events. However, the practical utility of the Hf-W chronometer has been retarded by the difficulty in sensitive and precise W isotopic measurements mainly caused by low ionisation efficiency in the mass spectrometer. We have developed a new analytical technique for W isotopes using a multiple collector-ICP mass spectrometer (MC-ICPMS) coupled with a high recovery ion chromatographic technique. In this study, W isotopic compositions for various geochemical samples, covering sediments, volcanic rocks or ore deposits, have been measured.
The 182W/183W can change due to radiogenic contribution from beta-decay of radioactive nuclide 182Hf.
In fact, there was significant variation in resulting 182W/183W ratio for metallic meteorites (iron meteorites). This can be attributed either to the difference in timing of metal/silicate segregation inside the mo … More ther planetesimals, or to the heterogeneous distribution of Hf/W in the primary solar nebula. Most interesting feature is that the present 182W/183W ratio for IVB iron meteorites did not agree with the some of the published values, indicating that Hf/W ratio was not totally homogenised at the early stage of the solar nebula. In strike contrast, resulting 182W/183W for geochemical materials did not vary measurably, suggestive of either slow accretion rate of the Earth, or total reset of the Hf-W isotopic system by a giant impact event. Thus the present 182W/183W ratio data could provide key information about the early sequence of the solar system.
Despite the absence in variation in 182W/183W ratio for the geochemical samples, we found that W in some geochemical samples was isotopically fractionated through the sample formation sequence.
Resulting 186W/183W (expressed as epsilon units) for JMn-1 and HSD show significantly higher 1.5ε and 4.5ε than the value for NIST-3163 (international isotopic standard), respectively. It is widely recognized that oxidation state of W can change through cosmo- and geo-chemical processes, and therefore, W in geochemical materials could provide us physico-chemical information for the production sequence of the sample. Although mechanism of the isotopic fractionation of W is not well understood at this moment, the small but significant variations in non-radiogenic W components indicated clearly that further detailed geochemical discussion is possible by the combination of Hf-W chronology and stable isotope geochemistry using W, which would open up the new research field in the Earth Sciences. Less

Report

(4 results)
  • 2005 Annual Research Report   Final Research Report Summary
  • 2004 Annual Research Report
  • 2003 Annual Research Report
  • Research Products

    (23 results)

All 2005 2004 2003 Other

All Journal Article (21 results) Book (1 results) Publications (1 results)

  • [Journal Article] Precise Zn Isotopic Ratio Measurement of Human Red Blood Cell and Hair Samples by Multiple Collector-ICP-Mass Spectrometry2005

    • Author(s)
      Takeshi Ohno, Atsuko Shinohara, Momoko Chiba, Takafumi Hirata
    • Journal Title

      Anal. Sci. 21

      Pages: 1-4

    • NAID

      10015513646

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] U-Pb and Lu-Hf Isotope Systematics of Zircons from the Mississippi River sand : Implications for Reworking and Growth of Continental Crust2005

    • Author(s)
      Tsuyoshi Iizuka, Takafumi Hirata, Tsuyoshi Komiya, Shuji Rino, Ikuo Katayama, Akihisa Motoki, Shigenori Maruyama
    • Journal Title

      Geology 33

      Pages: 485-488

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Annual Research Report 2005 Final Research Report Summary
  • [Journal Article] In-situ Hf Isotopic Analysis on Zircons using ArF Excimer Laser Ablation-ICP-Mass Spectrometry2005

    • Author(s)
      Tsuyoshi Iizuka, Takafumi Hirata
    • Journal Title

      Chemical Geology 220

      Pages: 121-137

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Annual Research Report 2005 Final Research Report Summary
  • [Journal Article] Reduction of mercury background on ICP-mass spectrometry for in-situ U-Pb age determinations of zircon samples2005

    • Author(s)
      Takafumi Hirata, Tsuyoshi Iizuka, Yuji Orihashi
    • Journal Title

      J. Anal. Atom. Spectrom. 20

      Pages: 696-701

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Towards a Deterministic Model of Planetary Formation. III Mass distribution of short-period planets around stars of various masses.2005

    • Author(s)
      Ida, S., D.N.C.Lin
    • Journal Title

      Astrophys. J. 626

      Pages: 1045-1060

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Dependence of exoplanets on host stars' metallicity and mass2005

    • Author(s)
      Ida, S., D.N.C.Lin
    • Journal Title

      Prog. Theor. Phys. 158

      Pages: 68-85

    • NAID

      110001584324

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Precise Zn Isotopic Ratio Measurement of human Red Blood Cell and Hair Samples by Multiple Collector-ICP-Mass Spectrometry2005

    • Author(s)
      Takeshi Ohno, Atsuko Shinohara, Momoko Chiba, Takafumi Hirata
    • Journal Title

      Anal.Sci. 21

      Pages: 1-4

    • NAID

      10015513646

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] U-Pd and Lu-Hf Isotope Systematics of Zirocons from the Mississippi River sand : Implications for Reworking and Growth of Continental Crust2005

    • Author(s)
      Tsuyoshi Iizuka, Takafumi Hirata, Tsuyoshi Kokiya, Shuji Rino, Ikuo Katayama, Akihisa Motoki, Shigenori Maruyama
    • Journal Title

      Geology 33

      Pages: 485-488

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] In-situ Hf Isotopic Analysis on Zirocons using ArF Excimer Laser Ablation-ICP-Mass Spectrometry2005

    • Author(s)
      Tsuyoshi Iizuka Takafumi Hirata
    • Journal Title

      Chemical Geology 220

      Pages: 121-137

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Reduction of mercury background on ICP-mass spectrometry for in-situ U-Pb age determinations of zirocon samples2005

    • Author(s)
      Takafumi Hirata, Tsuyoshi Iizuka, Yuji Orihashi
    • Journal Title

      J.Anal.Atom.Spectrom. 20

      Pages: 696-701

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Towards a Deterministic Model of Planetary Formation. III Mass distribution of short-period planets around stars of various masses2005

    • Author(s)
      Ida, S., D.N.C.Lin
    • Journal Title

      Astrophys.J. 626

      Pages: 1045-1060

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Dependence of exoplanets on host stars' metallicity and mass2005

    • Author(s)
      Ida, S., D.N.C.Lin
    • Journal Title

      Prog.Theor.Phys. 158

      Pages: 68-85

    • NAID

      110001584324

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Annual Research Report 2005 Final Research Report Summary
  • [Journal Article] Precise Zn Isotopic Ratio Measurement of Human Red Blood Cell and Hair Samples by Multiple Collector-ICP-Mass Spectrometry2005

    • Author(s)
      Takeshi Ohno, Atsuko Shinohara, Momoko Chiba, Takafumi Hirata
    • Journal Title

      Anal.Sci. 21

      Pages: 1-4

    • NAID

      10015513646

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Reduction of mercury background on ICP-mass spectrometry for in-situ U-Pb age determinations of zircon samples2005

    • Author(s)
      Takafumi Hirata, Tsuyoshi Iizuka, Yuji Orihashi
    • Journal Title

      J.Anal.Atom.Spectrom. 20

      Pages: 696-701

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Towards a Deterministic Model of Planetary Formation. III Mass distribution of short-period planets around stars of various masses.2005

    • Author(s)
      Ida, S., D.N.C.Lin
    • Journal Title

      Astrophys. 626

      Pages: 1045-1060

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Separation of isobaric interferences by means of mass-shift technique on ICP-Mass Spectrometry2004

    • Author(s)
      T.Hirata
    • Journal Title

      J.Mass Spectrometry Soc.Japan 52

      Pages: 171-171

    • Related Report
      2004 Annual Research Report
  • [Journal Article] レーザーアブレーション-誘導結合プラズマ質量分析法による地球化学試料の微量元素分析2004

    • Author(s)
      平田, 浅田, Tunheng, 大野, 飯塚, 早野, 谷水, 折橋
    • Journal Title

      分析化学 53

      Pages: 491-491

    • NAID

      110002905391

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Isotopic Analysis of Fe in Human Red Blood Cells by Multiple-Collector-ICP-Mass Spectrometry2004

    • Author(s)
      T.Ohno, A.Shinohara, I.Kohge, M.Chiba, T.Hirata
    • Journal Title

      Anal.Sci. 20

    • NAID

      10012850567

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Development of Signal Smoothing Device for Laser Ablation-ICP-mass spectrometer2004

    • Author(s)
      A.Tunheng, T.Hirata
    • Journal Title

      J.Anal.Atom.Spectrom. 19

      Pages: 932-932

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Toward a Deterministic Model of Planetary : Formation. I. a Desert in the Mass and Semi Major Axis Distributions2004

    • Author(s)
      Ida, S., D.N.C.Lin
    • Journal Title

      Astrophys.J. 604

      Pages: 388-388

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Toward a Deterministic Model of Planetary : Formation. II. The Formation and Retention of Gas Giant Planets2004

    • Author(s)
      Ida, S., D.N.C.Lin
    • Journal Title

      Astrophys.J. 616

      Pages: 616-616

    • Related Report
      2004 Annual Research Report
  • [Book] マントル・地殻の地球化学(分担執筆)2003

    • Author(s)
      平田 岳史
    • Total Pages
      308
    • Publisher
      培風館
    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Publications] Tkafumi Hirata: "Chemically assisted-Laser ablation-inductively coupled plasma-mass spectrometry"Analytical Chemistry. 75. 228-233 (2003)

    • Related Report
      2003 Annual Research Report

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Published: 2003-04-01   Modified: 2016-04-21  

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