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2001 Fiscal Year Final Research Report Summary

study on the environmental and material evolution in the early system solar based on the chemical of composition of meteorites

Research Project

Project/Area Number 11440167
Research Category

Grant-in-Aid for Scientific Research (B)

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

Principal Investigator

EBIHARA Mitsuru  Tokyo Metropolitan Univ., Graduate School of Science, Professor, 理学研究科, 教授 (10152000)

Co-Investigator(Kenkyū-buntansha) OURA Yasuji  Tokyo Metropolitan Univ., Graduate School of Science, Assistant, 理学研究科, 助手 (90291567)
Project Period (FY) 1999 – 2001
Keywordsvolatile elements / halogens / meteorite parent body / chondrules / refractory siderophile dements / platinum group elements / rare earth elements / martian meteorites
Research Abstract

This year is the last year of the project. In this year, we have conducted the following research subjects ; (i) establishment of the analytical technique for four halogens in solid silicate materials and its application to meteorite samples, (ii) distribution of refractory siderophile elements in meteorites and its cosmochemical implications, (iii) distribution of rare earth elements (REEs), Th and U in meteorites and its cosmochemical implications, and (iv) development of analytical techniques applicable to meteorite samples. For the first subject, we established an analytical method for determining four halogens in a single sample weighing 50 to 100 mg and applied it to chondritic meteorite samples. We also investigated the distribution of Cl, Br and I in chondritic meteorites and observed that I is distributed in pyroxene and/or plagioclase to some extent, being different from Cl and Br. This observation seems to be very important in considering cosmochemical behavior of I, which has not been well described yet. For the second subject, we determined refractory siderophile elements in martian meteorites and observed that martian meteorites contain these elements at a level of 10^<-2> to 10^<-3> x Cl. This is understood in terms of an addition of siderophile elements as a last veneer after the formation of core. The third subject has just completed and the paper related with this subject will be prepared soon. In this subject, we determined REEs, Th and U in chondrules and observed that their abundances change in accordance with the activity of thermal metamorphism in the parent body.

  • Research Products

    (12 results)

All Other

All Publications (12 results)

  • [Publications] P.Kong, M.Ebihara, H.Palme: "Siderophile elements in Martian meteorites and implication for core formation in Mars"Geochim. Cosmochim. Acta. 63. 1865-1875 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] P.Kong, M.Ebihara, H.Palme: "Distribution of siderophile elements in CR chondrites : Evidence for evaporation and..."Geochim. Cosmochim. Acta. 63. 2637-2652 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.Ebihara, K.Shinotsuka, H.Ozaki, Y.Oura: "Critical evaluation of CI chondrites as the solar system standard of elemental,..."In Origin of the elements in the solar system (ed. O.K.Manuel). 289-300 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] F.Kato, H.Ozaki, M.Ebihara: "Distribution of halogens in an Antarctic ordinary chondrite, Y-74014 (H6)"Antarctic Meteorite Res.. 13. 121-134 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] P.Kumar, M.Ebihara, S.K.Bhatiacharya: "^<196>Hg/^<202>Hg ratio and Hg content in meteorites and terrestrial standard rocks : ARNAA Study"Geochem.J.. 35. 101-116 (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Z.K.Zhao, X.Y.Mao, M.Ebihara: "A casual relationship between extinction of dinosaurs and K/T iridium enrichment in...."Palaeography, Palaeoclimatolography, Palaeoechology. (印刷中).

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] P.Kong: "Siderophile elements in Martian meteorites and implications for core formation in Mars"Geochim.Cosmochim.Acta. 63. 1865-1875 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] P.Kong: "Distribution of siderophile elements in CR chondrites : Evidence for evaporation and recondensation during chondrule formation"Geochim.Cosmochim.Acta. 63. 2637-2652 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] F.KATO: "Distribution of halogens in an Antarctic ordinary chondrite, Y-74014 (H6)"Antarctic Meteorite Res.. 13. 121-134 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] P.Kumar: "^<196>Hg/^<202>Hg ratio and Hg content in meteorites and terestrial standard rocks : A RNAA study"Geochem.J.. 35. 101-116 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Z.K.Zhao: "A causal relationship between extinction of dinosaurs and K/T iridium enrichment in the Nanxiong basin, south China : Evidence from dinosaur eggshells"Palaeography, Palaeochimatology, Palaeoechology. (in press).

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.EBIHARA, ed. O.K.Manuel: "Critical evaluation of CI chondrites as the solar system standard of elemental abundances"In Origin of the elements in the solar system, Kluwer Academic/Plenum Publisher, New York. 289-300

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 2004-04-14  

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