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1991 Fiscal Year Final Research Report Summary

Development of the ^<40>Ar- ^<39>Ar dating method based on the Ar extraction from a sample by using a laser beam.

Research Project

Project/Area Number 02554028
Research Category

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

Allocation TypeSingle-year Grants
Research Field 鉱物学(含岩石・鉱床学)
Research InstitutionEarthquake Research Institute, University of Tokyo

Principal Investigator

KANEOKA Ichiro  Earthquake Rersearch Institute, University of Tokyo, Professor, 地震研究所, 教授 (30011745)

Co-Investigator(Kenkyū-buntansha) 瀧上 豊  関東学園大学, 法学部, 助教授 (40206909)
KANEOKA Ichiro  Earthquake Research Institute, University of Tokyo, Professor (30011745)
Project Period (FY) 1990 – 1991
KeywordsLaser beam / Degassing / ^<40>Ar- ^<39>Ar dating / Argon gas / Minral / Mass spectrometer
Research Abstract

The main aim in this study is to develop the ^<40>Ar- ^<39>Ar dating method by extracting Ar gases from a sample with the aid of a laser beam. Through this study, we have examined fundamental problems in extracting Ar gases from a mineral under different conditions and obtained a prospect that the ^<40>Ar- ^<39>Ar dating would be possible with the amount of extracted Ar gases by this method.
Through this study, it has been revealed that the efficiency of heating a sample with a laser beam is controlled by many factors such. as the concentration of a laser beam, an angle of incidence of a laser beam to the surface of the sample, the efficiency of used lenses, the out-put power of the laser generator and so on. To observe the condition of the surface of a sample, an optical microscope is efficient, but is not always compatible with the best condition for the laser irradiation. We are trying to using a video system to observe the sample during a laser irradiation. There remain some problems in future, among which the estimate of the temperature on the surface of a sample during a laser irradiation, the estimate of a volume of a fused part by a laser irradiation and the fusing of a high temperature felscic mineral are included. In addition, to date a young volcanic rock of less than 10Ma with this method, it is essential to use a high sensitive and precise mass spectrometer to measure the very small amount of Ar degassed by a laser beam from a sample.

  • Research Products

    (12 results)

All Other

All Publications (12 results)

  • [Publications] Kaneoka,I.: "Radiometric age and Sr isotope characteristics of volcanic rocks from the Japan Sea floor." Geochem.J.24. 7-19 (1990)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Kaneoka,I.,Notsu,K.,Takigami,Y.,Fujioka,K.and Sakai,H.: "Constraints on the evolution of the Japan Sea based on ^<40>Ar- ^<39>Ar ages and Sr isotopic ratios for volcanic rocks of the Yamato Sea-mount chain in the Japan Sea." Earth Planet.Sci Lett.97. 211-225 (1990)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Takigami,Y.and Funaki,M.: " ^<Ar>- ^<39>Ar and K-Ar ages for igneous and metamorphic rocds from the Sor Rondane Mountains,East Antarctica." Proc.NIPR Symp.Antarct.Geosci.5. 122-135 (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Kaneoka,I.,Takaoka,N.and Yanai,K.: " ^<40>Ar- ^<39>Ar analyses of Y-74063 and ALH-78230:Consortium study on unique meteorites from Antarctica." Proc.NIPR Symp.Antarct.Meteorites. 5. (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Kaneoka,I.,Takigami,Y.,Takaoka,N.,Yamashita,S.and Tamai,K.: " ^<40>Ar- ^<39>Ar analyses of volcamic rocks recovered from the Japan Sea floor by Legs 127 and 128:Constraints on the age of formation of the Japan Sea." Tamaki,K.,Suyehiro,K.,Allan,J.,et al.,Proc.ODP.Sci.Results,128:College Station,TX(Ocean Drilling Program). (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Takigami,Y.,Funaki,M.and Tokied,K.: " ^<40>Ar- ^<39>Ar geochronological studies for some paleomagnetic samples of East Antarctica." Proc.Internatl.Symp.Antarct.Earth sci.

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Kaneoka, I.: "Radiometric age and Sr isotope charateristics of volcanic rocks from the Japan Sea floor." Geochem. J.24. 7-19 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Kaneoka, I., Notsu, K., Takigami, Y., Fujioka, K., and Sakai, H.: "Constraints on the evolution of the Japan Sea based on ^<40>Ar- ^<39>Ar ages and Sr isotopic ratios for volcanic rocks of theYamato Sea-mount chain in the Japan Sea." Earth Planet. Sci. Lett.97. 211-225 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Takigami, Y. and Funaki, M.: " ^<40>Ar- ^<39>Ar and K-Ar ages for igneous and metaporphic rocks from the Sor Roundane Mountains, East Antarctia." Proc. NIPR Symp. Antarct. Geosci.35. 122-135 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Kaneoka, I., Takaoka, N. and Yanai, K.: " ^<40>Ar- ^<39>Ar analyses of Y-74063 and ALH-78230 : consortium study on unique meteorites from Antarctica." Proc. NIPR Symp. Antarct. Meteorites. 5. (1992)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Kaneoka, I., Takigami, Y., Takaoka, N., Yamashita, S. and Tamaki, K.: " ^<40>Ar- ^<39>Ar analyses of volcanic rocks recovered from the Japan Sea floor by Legs 127 and 128 : constraints on the age of formation of the Japan Sea." Tamaki, K., Suyehiro, K., Allan, J. et al., Proc. ODP. Sci. Results, 128 : College Station, TX (Ocean Drilling Program). (1992)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Takigami, Funaki M. and tokieda, K.: " ^<40>Ar- ^<39>Ar geochronological studies for some paleomagnetic samples of East antarctica." Proc. International. Symp. antarct. Earth Sci.

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

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Published: 1993-03-16  

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