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Research on concentrations and isotopic abundances of retractory siderophile elements in Ca, Al-rich inclusions and estimation of chemical and physical conditions of the primitive solar nebula

Research Project

Project/Area Number 09640588
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field 地球化学
Research InstitutionNational Science Museum

Principal Investigator

YONEDA Shigekazu  National Science Musueum, Dept. of Science and Engineering, Senior Curator, 理工学研究部, 主任研究官 (60210788)

Project Period (FY) 1997 – 1998
Project Status Completed (Fiscal Year 1998)
Budget Amount *help
¥3,300,000 (Direct Cost: ¥3,300,000)
Fiscal Year 1998: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1997: ¥2,700,000 (Direct Cost: ¥2,700,000)
Keywordsmeteorite / inclusion / refractory / siderophile / platinum group / extinctnuclide / インクルージョン / レニウム-オスミウム法 / 太陽系星雲
Research Abstract

In order to estimate chemical and physical conditions of the primitive solar nebula, Ca, Al-rich inclusions in the Allende CV3 chondrite were investigated. Methods for quantitative analysis and isotopic ratio measurement of refractory siderophile elements were developed and a search for extinct nuclides was performed.
Three Ca, Al-rich inclusions including a lcm-radius spherule were separated from three specimens of the Allende meteorite in the collection of the, National Science Museum A11 of them are coarse-grained inclusions and, from observation using SEM-EDX, one is classified as a Type A inclusion with melilite and spinel ; another inclusion is probably a Type C because of high abundance of anorthite ; the other could be a Type B Using a SIMS at Hiroshima University, Mg-26 excesses due to the extinct nuclideAl-26 were observed in anorthite of the Type C inclusion Also, a trace of the extinct nuclide Cs-135 was detected in an acid-soluble fraction in an H chondrite
Methods for quantitative analysis of refractory siderophile elements using an ICP-MS were explored in addition to the well-developed NAA methods. Change of sensitivities of the refractory siderophile elements had to be monitored and severe memory, effects were observed at the measurements of Os. For the negative thermal ionization mass spectrometry of the platinum group elements and other siderophile elements, basic behaviors of formation of negative thermal ions from a mixed solution were investigated in collaboration with Prof. K CJ. Heumann at the University of Mainz Using a Pt single filament method, the intensities of negative thermal ions from the same amount of elements were Re > Os > Ir -- Ru > Mo The Re filament method could be used for better ionization of W and Mo.

Report

(3 results)
  • 1998 Annual Research Report   Final Research Report Summary
  • 1997 Annual Research Report
  • Research Products

    (3 results)

All Other

All Publications (3 results)

  • [Publications] S.Yoneda: "Formation Negative Thermal Ions from a Mixed Solution of Platinum Group Elements"Bulletin of the National Science Museum,Tokyo,SeriesE. 21. 1-7 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] S. Yoneda and K. G. Heumann: "Formation of Negative Thermal Ions from a Mixed Solution of Platinum Group Elements"Bulletin of the National Science Museum, Tlkyoi, Series E. Vol. 21. 1-7 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] S.Yoneda: "Formation of Negative Thermal Ions from a Mixed Solutio of Platinum Group Elements" Bulletin of the National Science Museum,Tokyo,Series E. 21. 1-7 (1998)

    • Related Report
      1998 Annual Research Report

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Published: 1997-04-01   Modified: 2016-04-21  

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