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2003 Fiscal Year Final Research Report Summary

Geochemical Study on the Oldest Halite Fossil in the Solar System

Research Project

Project/Area Number 13440165
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field 地球化学
Research InstitutionThe University of Tokyo

Principal Investigator

NAGAO Keisuke  The University of Tokyo, Graduate School of Science, Professor, 大学院・理学系研究科, 教授 (40131619)

Co-Investigator(Kenkyū-buntansha) KAGI Hiroyuki  The University of Tokyo, Graduate School of Science, Associate Professor, 大学院・理学系研究科, 助教授 (70233666)
TAKIGAMI Yutaka  Kanto Gakuen University, Professor, 法学部, 教授 (40206909)
KANEOKA Ichiro  The University of Tokyo, Earthquake Research Institute, Professor, 地震研究所, 教授 (30011745)
MIURA Yayoi n.  The University of Tokyo, Earthquake Research Institute, Research Assistant, 地震研究所, 助手 (90282730)
NAKAMURA Tomoki  Kyushu University, Faculty of Science, Associate Professor, 大学院・理学研究院, 助教授 (20260721)
Project Period (FY) 2001 – 2003
Keywordsnoble gas isotopes / halite / halogens / neutron irradiation / I-Xe age / ^<40>Ar-^<39>Ar age / Zag meteorite / formation age
Research Abstract

Halogens and their crystals (halide) have been investigated in Zag and other halogen containing meteorites by detecting halogen-derived noble gas isotopes ^<80>Kr, ^<82>Kr and ^<128>Xe^<129>Xe from extinct nuclide was ^<129>I also measured in these meteorites. Halide crystals are dark phase portion of the Zag meteorite. Size of most crystals are estimated to be smaller than 0.1 mm, which would be surrounded by silicates insoluble in water. Halogens are also concentrated in small materials in Yamato-74191 (L3.6) meteorite. The halogen enrichments in these meteorite are likely resulted by liquid water with high concentrations of halogens presented on their parent planetesimals. Though origin of the waters is not clear, they might have been brought through bombardment by water containing objects such as carbonaceous chondrites or comets.
To study the event concerning the halogen enrichments, we constructed noble gas extraction and purification line for noble gas analysis of neutron irradiated meteorites. Modification of VG3600 noble gas mass spectrometer used for ^<40>Ar-^<39>Ar dating was carried out to improve sensitivity and stability of the mass spectrometer in the Radioisotope Center, University of Tokyo. Combining the noble gas line and the mss spectrometer, I-Xe dating of meteorites can be measurable for the first time in Japan. This method began to clarify the timing of halogen enrichment process in meteorites.

  • Research Products

    (22 results)

All Other

All Publications (22 results)

  • [Publications] Okazaki R et al.: "Noble-gas-rich chondrules in an enstatite chondrite."Nature. 412. 795-798 (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Osawa T. et al.: "Mid-Infrared transmission spectra of individual Antarctic micrometeorites and carbonaceous chondrites."Antarctic Meteorite Research. 14. 71-88 (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Honda, M. et al.: "Cosmogenic nuclides in the Brenham Pallasite"Meteorit.Planet.Sci.. 37. 1711-1728 (2002)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Osawa, T, et al.: "Concentrations in Antarctic micrometeorites collected from Kuwagata Nunatak in the Yamato meteorite ice field."Antarct.Meteorite Res.. 15. 165-177 (2002)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Osawa T., Nagao K.: "Noble gas compositions of Antarctic micrometeorites collected at the Dme Fuji Station in 1996 and 1997"Meteorit.Planet.Sci.. 37. 911-936 (2002)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Takaoka N. et al.: "Noble gases in Kobe carbonaceous chondrite"Geochem.J.. 36. 355-368 (2002)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Okazaki R., Nagao K., Imae N., Kojima H.: "Noble gas signatures of Antarctic nakhlites, Yamato (Y) 000593, Y000749, and Y000802"Antarct.Meteorite Res.. 16. 58-79 (2003)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Okazaki R., Nakamura T., Takaoka N., Nagao K.: "Noble gases in ureilites released by crushing"Meteoritics & Planetary Science. 38. 767-782 (2003)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Osawa T., Nakamura T., Nagao K.: "Noble gas isotopes and mineral assemblages of Antarctic micrometeorites collected at the meteorite ice field around the Yamato Mountains"Meteoritics & Planetary Science. 38. 1627-1640 (2003)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Park J.et al.: "Noble Gas and Oxygen Isotopic Compositions of Towada H6-Chondrite from Aomori Prefecture, Japan."Geochem.J.. 37. 639-648 (2003)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Okazaki R., Nagao K.: "Noble gases of Yamato 980459 shergottite"Antarct.Meteorite Res.. (in press). (2004)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Okazaki R., Takaoka N., Nagao K., Sekiya M., Nakamura T.: "Noble-gas-rich chondrules in an enstatite chondrite"Nature. 412. 795-798 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Osawa T., Kagi H., Nagao K.: "Mid-Infrared transmission spectra of individual Antarctic micrometeorites and carbonaceous chondrites."Antarctic Meteorite Research. 14. 71-88 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Honda, M., Caffee, M.W., Miura, Y.N., Nagai, H., Nagao, K., Nishiizumi, K.: "Cosmogenic nuclides in the Brenham Pallasite."Meteorit.Planet.Sci.. 37. 1711-1728 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Osawa T., Nagao K.: "On low noble gas Concentrations in Antarctic micrometeorites collected from Kuwagata Nunatak in the Yamato meteorite ice field."Antarct.Meteorite Res.. 15. 165-177 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Osawa T., Nagao K.: "Noble gas compositions of Antarctic micrometeorites collected at the Dme Fuji Station in 1996 and 1997."Meteorit.Planet.Sci.. 37. 911-936 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Takaoka N., Nakamura T., Nagao K., Nakamura N.: "Noble gases in Kobe carbonaceous chondrite."Geochem.J.. 36. 355-368 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Okazaki R., Nagao K., Imae N., Kojima H.: "Noble gas signatures of Antarctic nakhlites, Yamato (Y) 000593, Y000749,and Y000802."Antarctic Meteorite Research. 16. 58-79 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Okazaki R., Nakamura T., Takaoka N., Nagao K.: "Noble gases in ureilites released by crushing."Meteoritics & Planetary Science. 38. 767-782 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Osawa T., Nagao K., Noguchi T., Nakazawa A., Mikada J.: "Remnant extraterrestrial noble gases in Antarctic cosmic spherules."Antarct.Meteorite Res.. 16. 196-219 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Park J., Okazaki R., Kusakabe M., Nagao K., Yoneda S.: "Noble Gas and Oxygen Isotopic Compositions of Towada H6-Chondrite from Aomori Prefecture, Japan."Geochem.J.. 38. 767-782 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Okazaki R., Nagao K.: "Noble gases of Yamato 980459 shergottite."Antarct.Meteorite Res. (in press). (2004)

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

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Published: 2005-04-19  

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