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Simultaneous measurement of argon isotopes using microchannel plates

Research Project

Project/Area Number 13354007
Research Category

Grant-in-Aid for Scientific Research (A)

Allocation TypeSingle-year Grants
Section展開研究
Research Field Petrology/Mineralogy/Science of ore deposit
Research InstitutionOkayama University of Science

Principal Investigator

ITAYA Tetsumaru  Okayama University of Science, Research Institute of Natural Sciences, Professor, 自然科学研究所, 教授 (60148682)

Co-Investigator(Kenkyū-buntansha) HYODO Hironobu  Okayama University of Science, Research Institute of Natural Sciences, Associate Professor, 自然科学研究所, 助教授 (50218749)
YAMAMOTO Isao  Okayama University of Science, Faculty of Science, Professor, 工学部, 教授 (50090220)
岡田 利典  海洋科学技術センター, IFREE, 技術研究員
Project Period (FY) 2001 – 2003
Project Status Completed (Fiscal Year 2003)
Budget Amount *help
¥27,690,000 (Direct Cost: ¥21,300,000、Indirect Cost: ¥6,390,000)
Fiscal Year 2003: ¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000)
Fiscal Year 2002: ¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000)
Fiscal Year 2001: ¥20,930,000 (Direct Cost: ¥16,100,000、Indirect Cost: ¥4,830,000)
KeywordsAr-Ar dating method / multi-detector / microchannel plates / position sensitive detector / Backgammon method / ion counting method / neutron irradiation / single mineral age / 単結晶鉱物年代
Research Abstract

In 40Ar/39Ar stepwise heating experiments, the fast measurements need to be carried out to obtain time-independent data sets, in particular for small samples. In this study, microchannel plates are used for ion detection, and simultaneous measurement of five argon isotopes from 36Ar to 40Ar was attempted.
Simple combination of microchannel plates and a position sensitive detector is not suitable in an ultrahigh vacuum system because it needs baking at temperature over 100℃. Thus, we adopted the two dimensional Modified Backgammon method with Weighted coupling Capacitors(MBWC) designed by Drs Mizokawa at Wakayama College of Technology and Shiromaru at Tokyo Metropolitan University.
36Ar,38Ar and 40Ar from atmosphere were detected simultaneously, but the system was not enough for quantitative measurements. The large volume of 40Ar disturbs the simultaneous measurement of 36Ar and 38AT signals which is approximately one three hundredth and one sixteen hundredth, respectively. The system allows two dimensional ion detection, and it is effective to adjust ion optics of each isotope in a mass spectrometer.
Designing an one-dimensional chain of linear channeltron was considered to make quantitative measurements, and it became possible with coorperation with Dune Inc. Combining the two dimensional system and a small mass spectrometer with one dimensional system allow easy tuning of ion optics and highly sensitive quantitative argon mass spectrometry. Independent developments of two different types of mass spectromenters is now resulting in a new ultra small highly sensitive mass spectrometer.
Signals from the position sensitive detector is measured by the ion counting method. The interface and program were developed as well as the automatic control for the measurement. The control and measurement units are connected via LAN cable. The extraction and purification system to separate ultra low volumes of the standard air and high purity gases were completed.

Report

(4 results)
  • 2003 Annual Research Report   Final Research Report Summary
  • 2002 Annual Research Report
  • 2001 Annual Research Report
  • Research Products

    (49 results)

All Other

All Publications (49 results)

  • [Publications] Kawakami, G.: "Middle Eocene (43-45 Ma) biotite K-Ar ages of granitoid clasts from the Miocene Kawabata Formation, Hokkaido, Japan : implicatios for unroofing of the Hidaka belt."Island Arc. 印刷中. (2004)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Oh, C.W.: "Tectono-metamorphic Evolution of the Ogcheon Metamorphic Belt, South Korea : Tectonic Implications in East Asia."Island Arc. 印刷中. (2004)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Imaoka, T.: "K-Ar geochronolog of a Middle Miocene submarine volcano-plutonic complex in SW Japan."Geological Magazine. 印刷中. (2004)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Takeshita, H.: "Chemical features of white micas from the Piemonte calcschists, western Alps and implications for K-Ar ages of metamorphism."Gondwana Research. Vol.7,No.2. 457-466 (2004)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Itaya, T.: "New type of gas mass spectrometer for K-Ar (Ar-Ar) dating -a preliminary report-"Bull.Res.Inst.Natural Sci., Okayama Univ.Sci.. No.29. 1-7 (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] 兵藤博信: "質量分析計イオン加速用高電圧の安定性(II)"岡山理科大学自然科学研究所研究報告. No.29. 8-12 (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Wallis, S: "Cenozoic regional metamorphism in the Mesozoic Longmenshan orogen : Implications for geodynamic models of eastern Tibet."Geology. Vol.31. 745-748 (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Sawada, Y.: "The age of Orrorin tugenensis, an early hominid from the Tugen Hills, Kenya"C.R.Palevol. Vol.1. 293-303 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Miyashita, A.: "K-Ar age and chemistry of phengite from the Sanbagawa schists in the Kanto Mountains, central Japan, and their implication for exhumation tectonics."Gondwana Research. Vol.5 No.4. 837-848 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] 沢井長雄: "九州中部、馬上金鉱床地域の火山岩類の金鉱床のK-Ar年代"資源地質. 52巻2号. 121-133 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Nam, T.N.: "40Ar/39Ar single grain dating and mineral chemistry of hornblendes south of the Red River shear zone (Vietnam): New evidence for Early Proterozoic tectonothermal event."Gondwana Research. Vol.5 No.4. 801-812 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Kim, S.W.: "Metamorphic K-feldspar in low-grade meta-sediments from the Ogcheon metamorphic belt in South Korea."Gondwana Research. Vol.5 No.4. 849-856 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] 兵藤博信: "質量分析計イオン加速用高電圧の安定性と自動測定"岡山理科大学自然科学研究所研究報告. 28号. 19-23 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Hayward, BW: "K-Ar ages of early Miocene arc-type volcanoes in northern New Zealand."NZ.Jour.Geol.Geophys.. Vol.44. 285-311 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Tatsumi, Y: "Tectonic setting of high-Mg andesite magmatism in SW Japan arc : K-Ar chronology of the Setouchi volcanic belt."Geophys.J.Int.. Vol.144. 625-631 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Imaoka, T.: "Timing of hydrothermal activity in the Oligocene Hamada cauldron, SW Japan : evidence from K-Ar ages of sericites."Mineral Resources. Vol.51 No.1. 55-62 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] 高見美智夫: "岐阜県および沖縄県のジュラ紀-白亜紀初頭付加体に産するP-T境界付近の遠洋性粘土岩のK-Ar年代"地質学雑誌. 107巻3号. 222-227 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Cho, KH.: "Timing of the hydrothermal alteration associated with the fault activities along the Ulsan fault zone, southeast Korea."Econ.Environ.Geol.. Vol.34 No6. 583-593 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Kawakami, G., Arita, K., Okada, T., Itaya, T.: "Middle Eocene(43-45 Ma) biotite K-Ar ages of granitoid clasts from the Miocene Kawabata Formation, Hokkaido, Japan : implications for unroofing of the Hidaka belt."Island Arc. (in press). (2004)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Oh, C.W., Kim, S.W., Ryu, I-C., Okada, T., Hyodo, H., Itaya, T.: "Tectono-metamorphic Evolution of the Ogcheon Metamorphic Belt, South Korea : Tectonic Implications in East Asia."Island Arc. (in press). (2004)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Imaoka, T., Itaya, T.: "K-Ar geochronology of a Middle Miocene submarine volcano-plutonic complex in SW Japan."Geological Magazine. (in press). (2004)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Takeshita, H, Gouzu C., Itaya, T.: "Chemical features of white micas from the Piemonte calcschists, western Alps and implications for K-Ar ages of metamorphism."Gondwana Research. 7(2). 457-466 (2004)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Itaya, T., Okada T., Hyodo, H., Endo Y., Tomiyama, H.: "New type of gas mass spectrometer for K-Ar(Ar-Ar) dating -a preliminary report-"Bull.Res.Inst.Natural Sci., Okayama Univ.Sci.. 29. 1-7 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Wallis, S, Tsujimori, T., Aoya, M., Kawakami, T., Terada, K., Suzuki, K., Hyodo, H.: "Cenozoic regional metamorphism in the Mesozoic Longmenshan orogen : Implications for geodynamic models of eastern Tibet."Geology. 31. 745-748 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Sawada, Y., Pickford, M., Senut, B., Itaya, T., Hyodo, M., Miura, T., Kashine, C., Chujo, T., Fujii, H.: "The age of Orrorin tugenensis, an early hominid from the Tugen Hills, Kenya."C.R.Palevol. 293. 293-303 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Miyashita, A., Itaya, T.: "K-Ar age and chemistry of phengite from the Sanbagawa schists in the Kanto Mountains, central Japan, and their implication for exhumation tectonics."Gondwana Research. 5(4). 837-848 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Nam, X.N., Hyodo, H., Itaya, T., Matsuda, T.: "40Ar/39Ar single grain dating and mineral chemistry of hornblendes south of the Red River shear zone(Vietnam) : New evidence for Early Proterozoic tectonothermal event."Gondwana Research. 5(4). 801-812 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Kim, S.W., Itaya, T., Hyodo, H., Matsuda, T.: "Metamorphic K-feldspar in low-grade meta-sediments from the Ogcheon metamorphic belt in South Korea."Gondwana Research. 5(4). 849-856 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Cho, KH., Takagi, H., Iwamura, A., Awaji, D., Chang, TW., Shon, SW., Itaya, T., Okada, T.: "Timing of the hydrothermal alteration associated with the fault activities along the Ulsan fault zone, southeast Korea."Econ.Environ.Geol.. 34(6). 583-593 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Hayward, BW, Black, PM., Smith, IEM., Ballance, FFK, Itaya, T., Doi, M., Takagi, M., Bergman, S., Adams, CJ., Herzer, RH., Robertson, DJ.: "K-Ar ages of early Miocene arc-type volcanoes in northern New Zealand."NZ.Jour.Geol.Geophys.. 44. 285-311 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Tatsumi, Y., Ishikawa, N., Anno, K., Itaya, T.: "Tectonic setting of high-Mg andesite magmatism in the SW Japan arc : K-Ar chronology of the Setouchi volcanic belt."Geophys.J.Int.. 144. 625-631 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Imaoka, T., Nakashima, K., Itaya, T, Okada, T.: "Timing of hydrothermal activity in the Oligocene Hamada cauldron, SW Japan : evidence from K-Ar ages of sericites."Mineral Resources. 51(1). 55-62 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Kawakami, G.: "Middle Eocene (43-45 Ma) biotite K-Ar ages of granitoid clasts from the Miocene Kawabata Formation, Hokkaido, Japan : implications for unroofing of the Hidaka belt"Island Arc. (印刷中). (2004)

    • Related Report
      2003 Annual Research Report
  • [Publications] Oh, C.W.: "Tectono-metamorphic Evolution of the Ogcheon Metamorphic Belt, South Korea : Tectonic Implications in East Asia"Island Arc. (印刷中). (2004)

    • Related Report
      2003 Annual Research Report
  • [Publications] Imaoka, T.: "K-Ar geochronology of a Middle Miocene submarine volcano-plutonic complex in SW Japan"Geological Magazine. (印刷中). (2004)

    • Related Report
      2003 Annual Research Report
  • [Publications] Wallis, S.: "Cenozoic regional metamorphism in the Mesozoic Longmenshan orogen : Implications for geodynamic models of eastern Tibet"Geology. Vol.31. 745-748 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] Itaya, T.: "New type of gas mass spectrometer for K-Ar (Ar-Ar) dating -a preliminary report-"Bull.Res.Inst.Natural Sci., Okayama Univ.Sci.. No.29. 1-7 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] 兵藤博信: "質量分析計イオン加速用高電圧の安定性(II)"岡山理科大学自然科学研究所研究報告. 29号. 8-12 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] Sawada, Y.: "The age of Orrorin tugenensis, an early hominid from the Tugen Hills, Kenya"C. R. Palevol. Vol.1. 293-303 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] Miyashita, A.: "K-Ar age and chemistry of phengite from the Sanbagawa schists in the Kanto Mountains, central Japan, and their implication for exhumation tectonics"Gondwana Research. Vol. 5 No. 4. 837-848 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] Nam, T. N.: "40Ar/39Ar single grain dating and mineral chemistry of hornblendes south of the Red River shear zone (Vietnam): New evidence for Early Proterozoic tectonothermal event"Gondwana Research. Vol. 5 No.4. 801-812 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] Kim, S. W.: "Metamorphic K-feldspar in low-grade meta-sediments from the Ogcheon metamophic belt in South Korea"Gondwana Research. Vol. 5 No. 4. 849-856 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] 沢井長雄: "九州中部、馬上金鉱床地域の火山岩類と金鉱床のK-Ar年代"資源地質. 52巻2号. 121-133 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] 兵藤博信: "質量分析計イオン加速用高電圧の安定性と自動測定"岡山理科大学自然科学研究所研究報告. 28号. 19-23 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] Hayward, BW: "K-Ar ages of early Miocene arc-type volcanoes in northern New Zealand"NZ. Jour. Geol. Geophys.. Vol.44. 285-311 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] Tatsumi, Y: "Tectonic setting of high-Mg andesite magmatism in the SW Japan arc : K-Ar chronology of the Setouchi volcanic belt"Geophys. J. Int.. Vol.144. 625-631 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] Imaoka, T.: "Timing of hydrothermal activity in the Oligocene Hamada cauldron, SW Japan : evidence from K-Ar ages of sericites"Mineral Resources. Vol.51No.1. 55-62 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] 高見美智夫: "岐阜県および沖縄県のジュラ紀-白亜紀初頭付加体に産するP-T境界付近の遠洋性粘土岩のK-Ar年代"地質学雑誌. 107巻3号. 222-227 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] Nam, T.N.: "Ar/Ar single grain dating and mineral chemistry of hornblende south of the Red River shear zone : New Evidence for Early Proterozoic tectonothermal event"Gondwana Research. Vol.5(印刷中). (2002)

    • Related Report
      2001 Annual Research Report

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Published: 2001-04-01   Modified: 2016-04-21  

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