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Study of noble gas carrier "Q" in meteorites

Research Project

Project/Area Number 10440162
Research Category

Grant-in-Aid for Scientific Research (B).

Allocation TypeSingle-year Grants
Section一般
Research Field 地球化学
Research InstitutionOsaka University

Principal Investigator

MATSUDA Jun-ichi  Osaka Univ., Dept.of Earth and Space Science, Professor, 大学院・理学研究科, 教授 (80107945)

Co-Investigator(Kenkyū-buntansha) MATSUMOTO Takuya  Osaka Univ., Dept.of Earth and Space Science, Research Associate, 大学院・理学研究科, 助手 (50294145)
Project Period (FY) 1998 – 2000
Project Status Completed (Fiscal Year 2000)
Budget Amount *help
¥4,300,000 (Direct Cost: ¥4,300,000)
Fiscal Year 2000: ¥1,700,000 (Direct Cost: ¥1,700,000)
Fiscal Year 1999: ¥2,600,000 (Direct Cost: ¥2,600,000)
KeywordsPresolar diamond / Allende / Meteorite / Noble gas / Isotope / Q / HL
Research Abstract

1. Laboratory experiments of change of Q by aqueous alteration
We put Allende matrix in a pressure vessel, and kept it at 200℃ for 1, 2, 3, and 4 weeks. The concentrations of Q and HL noble gases in both host phases (phase Q and presolar diamonds) decreased with increasing the duration time of the experiment. Furthermore, the phase Q seems to be more easily damaged compared to presolar diamonds. We found that cosmogenic and radiogenic components are also removed by the aqueous treatment.
2. An attempt to separate Q and HL
The black floating material obtained by the freeze-thaw decomposition of the Allende meteorite is carbon and is very similar to the typical chemical residue of Allende in noble gas concentrations and isotopic components. We prepared 10 fractions of this material by the density separation. The noble gases are mostly enriched in the fraction with the density of 1.65g/cm3, and decrease in the higher density fractions. However, the isotopic compositions are more or less similar in all fractions, suggesting that the separation of Q and HL was not successful. It is likely that the phase Q is on the surface of presolar diamonds.
3. The extraction of Q by organic solvents
We put Allende in toluene and tried to extract Q by organic solvent. We measured noble gas concentrations and isotopes in the extracted material and the residue. The noble gas components have no change by this treatment, indicating that Q is not removed by toluene.

Report

(4 results)
  • 2000 Annual Research Report   Final Research Report Summary
  • 1999 Annual Research Report
  • 1998 Annual Research Report
  • Research Products

    (9 results)

All Other

All Publications (9 results)

  • [Publications] Matsuda J.: "Purely physical separation of a small fraction highly concentrated in noble gases from the Allende meteorite."Meteorit.Planet.Sci.. 34. 129-136 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Zaizen S.: "Reexamination of purely physical separation of the phase enriched in noble gases from the Allende meteorite"Antarct.Meteorite Res.. 13. 100-111 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Nakasyo E.: "A laboratory experiment on the influence of acqueous alteration on noble gas compositions in the Allende meteorite"Antarct.Meteorite Res.. 13. 135-144 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Matsuda J., S.Amari and K.Nagao: "Purely physical separation of a small fraction highly concentrated in noble gases from the Allende meteorite."Meteorit.Planet.Sci.. 34. 129-136 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Zaizen S., E.Nakasyo, T.Maruoka and J.Matsuda: "Reexamination of purely physical separation of the phase enriched in noble gases from the Allende meteorite"Antarct.Meteorite Res.. 13. 100-111 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Nakasyo E., T.Maruoka, T.Matsumoto and J.Matsuda: "A laboratory experiment on the influence of acqueous alteration on noble gas compositions in the Allende meteorite"Antarct.Meteorite Res.. 13. 135-144 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] S. Zaizen, E. Nakasyo, T. Maruoka and J. Matsuda: "Reexamination of purely physical separation of the phase enriched in noble gases from the Allende meteorite"Antarct. Meteorite Res.. 13(in press). (2000)

    • Related Report
      1999 Annual Research Report
  • [Publications] E. Nakasyo, T. Maruoka, T. Matsumoto and J. Matsuda: "A laboratory experiment on the influence of aqueous alteration on noble gas compositions in the Allende meteorite"Antarct. Meteorite Res.. 13(in press). (2000)

    • Related Report
      1999 Annual Research Report
  • [Publications] J.Matsuda,S.Amavi,K.Nagao: "Purely physical separation of a small traction of the Allende meteorite that is highly enriched in noble gases" Meteoritics & Planetary Science. 34. 129-136 (1998)

    • Related Report
      1998 Annual Research Report

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Published: 1999-04-01   Modified: 2016-04-21  

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