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Investigation of the Evolution of the Earth Based on ^<40>Ar-^<39>Ar Ages and Noble Gas Isotopes for Very Small Samples

Research Project

Project/Area Number 05403001
Research Category

Grant-in-Aid for General Scientific Research (A)

Allocation TypeSingle-year Grants
Research Field Geology
Research InstitutionUniversity of Tokyo

Principal Investigator

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

Co-Investigator(Kenkyū-buntansha) TAKIGAMI Yutaka  Kantogakuen University, Faculty of Law, Associate Professor, 法学部, 助教授 (40206909)
金子 隆之  東京大学, 地震研究所, 助手 (90221887)
森岡 正名  東京大学, アイソトープ総合センター, 助手 (20013766)
Project Period (FY) 1993 – 1995
Project Status Completed (Fiscal Year 1995)
Budget Amount *help
¥34,900,000 (Direct Cost: ¥34,900,000)
Fiscal Year 1995: ¥1,600,000 (Direct Cost: ¥1,600,000)
Fiscal Year 1994: ¥5,200,000 (Direct Cost: ¥5,200,000)
Fiscal Year 1993: ¥28,100,000 (Direct Cost: ¥28,100,000)
KeywordsEvolution of the Earth / Very Small Sample / Argon-Argon Age / Argon-Laser / Plateau Age / Noble Gas / Isotopic Composition / Rock / 希ガス同位体比 / ^<40>Ar-^<39>Ar年代 / レーザー加熱 / 海嶺玄武岩 / ガラス部分
Research Abstract

In this study, we have aimed to establish the methods by which we can measure ages and noble gas isotopes for very small samples and apply them to reveal the evolution of the Earth. To accomplish them, we have developed the system by combining an Ar-laser and a mass spectrometer with a high sensitivity so that we can measure noble gases degassed from very small samples of less than a few mg. Since the amounts of noble gases degasssed from concerned samples are very low, we tried to construct a system with low volume as much as possible and selected materials with least degassing in order to gain the minimum blank. In order to establish the Ar-Ar dating mathod with stepwise heating by using the laser system, a lot of fundamental experiments were performed and succeeded in getting plateau ages for samples with ages of a few hundred million years. Hence, it is concluded that samples with older ages of a few hudred million years can be safely measured by this method. However, precision is not sufficient enough for younger samples of less than 10 million years. Further, noble gases were degassed from a komatiite from Canada with an age of more than 2 b.y.and a present basalt of Izu-Oshima volcano by laser heating and their isotopes were measured. Except for radiogenic ^4He and ^<40>Ar, Kr and Xe contents seem to be a little enriched in the komatiite than the basalt. Since only limited samples were treated in the present study, it is difficult to relate the difference to the evolution of the Earth at present. In order to identify the characteristics of noble gas signatures with the evolution of the Earth, it is required to get data further for various kinds of samples with wider ranges of ages.

Report

(4 results)
  • 1995 Annual Research Report   Final Research Report Summary
  • 1994 Annual Research Report
  • 1993 Annual Research Report
  • Research Products

    (29 results)

All Other

All Publications (29 results)

  • [Publications] 兼岡一郎: "希ガス同位体比に基づいた地球内部の化学的構造と進化への制約" 地震. 48. 187-198 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Kaneoka,I.: "Noble gas constraints on the plume sources in the Earth's deep interior" The Earth's Central Part:Its Structure and Dynamics,ed. by T. Yukutake. 343-355 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Kaneoka,I.: "^<40>Ar-^<39>Ar analyses of Juvinas fragments from a large block" Proc. NIPR Symp.Antarctic Meteorites. 8. 287-296 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] 兼岡一郎: "放射年代測定における基本的な問題-年代測定における"年代"" 第四紀研究. 34. 261-264 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] 岩田尚能: "レーザー加熱^<40>Ar-^<39>Ar年代測定法で岩石の形成年代を調べる" 東京大学アイソトープ総合センターニュース. 26. 2-3 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Kaneoka,I.: "^<40>Ar-^<39>Ar and noble gas analyses of a H-type clast included in shocked L-chondrite from Antarctica" AGU Monographh:Earth Processes and Isotopic Code. 95. 21-31 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Kaneoka, I.: "Constraints on the chemical structure and evolution of the Earth based on noble gas isotopes (in Japanese with English abstract)" J.Seismol.Soc.Japan. 48. 187-198 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Kaneoka, I.: "Noble gas constraints on the plume sources in the Earth's deep interior" The Earth's Central Part : Its Structure and Dynamics, ed.by T.Yukutake. 343-355 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Kaneoka, I.: "^<40>Ar-^<39>Ar analyzes of Juvinas fragments from a large block" Proc.NIPR Symp.Antarctic Meteorites. 8. 287-296 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Kaneoka, I.: "Fundamental problems in radiometric dating-How we can define the meaning of a radio-metric age? - (in Japanese with English abstract)" The Quarternary Research. 34. 261-264 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Iwata, N.: "To investigate an age of a rock by the ^<40>Ar-^<39>Ar dating method with a laser-heating (in Japanese)" Isotope Center News, Univ.Tokyo. 26. 2-3 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Kaneoka, I.: "^<40>Ar-^<39>Ar and noble gas analyzes of a H-type clast included in shocked L-chondrite from Antarctica" AGU monograph : Earth Processes and Isotopic Gode. 95. 21-31 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] 兼岡一郎: "希ガス同位体比に基づいた地球内部の化学的構造と進化への制約" 地震. 48. 187-198 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] Kaneoka,I.: "Noble gas constraints on the plume souces in the Earth's deep interior" The Earth's Central Part:Its Structure and Dynamics,ed.by T.Yukutake. 343-355 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] Kaneoka,I.: "^<40>Ar-^<39>Ar analyses of Juvinas fragments from a large block" Proc.NIPR Symp.Antarct.Meteorites. 8. 287-296 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] 兼岡一郎: "放射年代測定における基本的な問題-年代測定における“年代"" 第四紀研究. 34. 261-264 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] 岩田尚能: "レーザー加熱^<40>Ar-^<39>Ar年代測定法で岩石の形成年代を調べる" 東京大学アイソトープ総合センターニュース. 26. 2-3 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] Kaneoka,I.: "^<40>Ar-^<39>Ar and noble gas analyses of a H-type clast included in shocked L-chondrite from Antarctica" AGU Monograph:Earth Processes,Reading Isotopic Code. 95. 21-31 (1996)

    • Related Report
      1995 Annual Research Report
  • [Publications] I.Kaneoka: "Noble gas constraints on the plume sources in the Earth's deep interior" The Earth's Central Part:Its Structure and Dynamics. (印刷中). (1995)

    • Related Report
      1994 Annual Research Report
  • [Publications] 兼岡 一郎: "希ガス同位体比に基づいた地球内部への化学的構造と進化への制約" 地震. 47(印刷中). (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] I.Kaneoka: "The effect of water on noble gas signatures of volcanic materials" Noble Gas Geochemistry and Cosmochemistry ed.by J. Matsuda,TERRAPUB,Tokyo. 205-215 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] I.Kaneoka: "^<40>Ar-^<39>Ar dating of terrestrial and exterrestrial materials-Basa-lts from the Japan Sea floor,Deccan Plateau and meteorites…" Sci.Rep.RITU. A40. 191-195 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] K.Shibata: "^<40>Ar/^<39>Ar analysis of K-feldspars from Cretaceous granitic rocks in Japan:Significance of perthitization in Ar loss" Chem.Geol(Isot.Geosci.Sect.). 115. 297-306 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] I.Kaneoka: "^<40>Ar-^<39>Ar analyses of volcanic rocks recovered from the Okushiri Ridge in the Japan Sea" Geochem.J.28. 1-9 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] Kaneoka,I.: "^<40>Ar-^<39>Ar analyses of volcanic rocks recovered from the Okushiri Ridge in Japan Sea." Geochem.J.28(印刷中). (1994)

    • Related Report
      1993 Annual Research Report
  • [Publications] 瀧上 豊: "レーザー加熱による^<40>Ar-^<39>Ar年代測定法。" 関東学園大学紀要. 22(印刷中). (1994)

    • Related Report
      1993 Annual Research Report
  • [Publications] Kaneoka,I.: "Noble gas signatures of magmatic sources and processes." Geochem.J.27. 201-211 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] Kaneoka,I.: "^<40>Ar-^<39>Ar analyses of a lunar meteorite(Yamato-86032)and a few LL3 and LL4 chondrites from Antarctica." Proc.NIPR Symp.Antarct.Meteorites. 6. 88-99 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] 兼岡一郎: "甲府盆地東部の岩脈群(峽東岩脈群)の活動時期-K-Ar年代測定に基づいた推定。" 火山. 38. 57-61 (1993)

    • Related Report
      1993 Annual Research Report

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Published: 1993-04-01   Modified: 2016-04-21  

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