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Geochemical constraints on the time scale of magma activity in island-arc area using multi-isotope systematics

Research Project

Project/Area Number 15540465
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Geochemistry/Astrochemistry
Research InstitutionThe University of Tokyo

Principal Investigator

NAKAI Shun'ichi  The University of Tokyo, Earthquake Research Institute, Associate Professor, 地震研究所, 助教授 (50188869)

Project Period (FY) 2003 – 2004
Project Status Completed (Fiscal Year 2004)
Budget Amount *help
¥3,500,000 (Direct Cost: ¥3,500,000)
Fiscal Year 2004: ¥1,500,000 (Direct Cost: ¥1,500,000)
Fiscal Year 2003: ¥2,000,000 (Direct Cost: ¥2,000,000)
KeywordsBeryllium-10 / fluid / volcanic rock / AMS / radioactive disequilibrium / analalytical method / Izu arc / 島弧 / マグマ上昇速度 / 加速器マス
Research Abstract

Cosmogenic nuclide 10Be with a half-life of 1.5 million years is produced in the atmosphere and subsequently absorbed onto marine sediment. Although 10Be trapped in the mantle at the formation of the Earth should have been decayed away, trace amount of 10Be has been confirmed in the volcanic rocks derived from subduction areas (0.1-25 million atoms per gram). The presence of 10Be is considered as a rigid evidence indicating the recycle of subducted sediment derived component in arc volcanism. Since the abundance of 10Be is very low, only Accelerator Mass Spectrometry (AMS) can measure its abundance in rock samples.
The 10Be analyses are still very difficult especially for volcanic rocks with low abundance. This study aims at establishing analytical method of 10Be in volcanic rock samples and applying it to the samples from Izu arc where information on other trace element abundances and isotopic tracers are available. Our final goal is to investigate across-arc variation of 10Be abundanc … More e and its relation with other trace element and isotopic systems.
Samples of basalt from Oshima, Miyakejima and Niijima were used for analyses to investigate across-arc variation. The samples were leached with dilute acid to remove surface contamination of 10Be following the method described by Shimaoka et al. (2004). After the leaching, about five grams of rock powder was digested with HF, HNO3 and HClO4. Be was separated from other major and minor constituents of rocks. 10Be abundances were analyzed with an AMS at the Research Center for Nuclear Science and Technology in the University of Tokyo. Abundances of 9Be were analyzed with a ICPMS at ERI in the University of Tokyo. 10Be abundances of the samples from Oshima, Miyakejima and Niijima have been determined as 0.79-0.80, 0.61-1.26 and 0.78 million atoms/g, respectively. Our results are consistent with previously reported values. 10Be/9Be ratios are higher in the samples from Oshima than other two islands. While other abundance ratios between fluid mobile to fluid immobile elements, such as Ba/Th and (238U/230Th) shows clear across-arc decrease, 10Be/9Be ratio of a sample from Niijima was similar to those from Miyakejima. This may result from the relatively larger partition coefficient of Be between mineral and fluid than those of Ba and U, which decreases mobility of Be. Less

Report

(3 results)
  • 2004 Annual Research Report   Final Research Report Summary
  • 2003 Annual Research Report
  • Research Products

    (21 results)

All 2005 2004 Other

All Journal Article (17 results) Publications (4 results)

  • [Journal Article] Lithium, strontium, and -neodymium isotopic compositions of oceanic island basalts in the Polynesian region : constraints on a Polynesian HIMU origin2005

    • Author(s)
      Nishio, Y., Nakai, S., Kogiso, T., Barsczus, H.G.
    • Journal Title

      Geochem.Jour. 39

      Pages: 91-103

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Hafnium isotope ratios of nine GSJ reference samples2005

    • Author(s)
      Hanyu, T., Nakai, S., Tatuta, R.
    • Journal Title

      Geochem.Jour. 91

      Pages: 83-90

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Lithium, strontium, and neodymium isotopic compositions of oceanic island basalts in the Polynesian region : constraints on a Polynesian HIMU origin2005

    • Author(s)
      Nishio, Y., Nakai, S., Kogiso, T., Barsczus, H.G.
    • Journal Title

      Geochemical Journal. 39

      Pages: 91-103

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Lithium, strontium, and neodymium isotopic compositions of oceanic island basalts in the Polynesian region : constraints on a Polynesian HIMU origin2005

    • Author(s)
      Nishio, Y., Nakai, S., Kogiso, T., Barsczus, H.G.
    • Journal Title

      Geochem.Jour. 39(in press)

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Hafnium isotope ratios of nine GSJ reference samples2005

    • Author(s)
      Hanyu, T., Nakai, S., Tatuta, R.
    • Journal Title

      Geochem.Jour. 39(in press)

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Lithium isotopic systematics of the mantle-derived ultramafic xenoliths : implications for EMl origin2004

    • Author(s)
      Nishio, Y., Nakai, S., et al.
    • Journal Title

      Earth Planet.Sci.Lett. 217

      Pages: 245-261

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Evidence for subduction-related components in the subcontinental mantle from low ^3He/^4He and ^<40>Ar/^<36>Ar ratio in mantle xenoliths from Far Eastern Russia2004

    • Author(s)
      Yamamoto, J., Kaneoka, I., Nakai, S., et al.
    • Journal Title

      Chem.Geol. 207

      Pages: 237-259

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Noble gas and carbon isotopes of fumarolic gas from Iwoima volcano, Izu-Ogasawara arc, Japan : implications for the origin of unusual arc magmatism2004

    • Author(s)
      Sumino, H., Notsu, K., Nakai, S., et al.
    • Journal Title

      Chem.Geol. 209

      Pages: 153-173

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Evaluation of chlorine isotope blank in Cl-37/Cl-35 isotopic measurements using total evaporation thermal ionization mass spectrometry2004

    • Author(s)
      Miyata, Y., Nakai, S., Yoneda, S.
    • Journal Title

      Bull.Natn.Sci.Mus., Tokyo, Ser.E 27

      Pages: 21-26

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Lithium isotopic systematics of the mantle-derived ultramafic xenoliths : implications for EMI origin2004

    • Author(s)
      Nishio, Y., Nakai, S., Yamamoto, J., Sumino, H., Matsumoto, T., Prikhod'ko V.S., Arai, S.
    • Journal Title

      Earth Planet.Sci.Lett. 217

      Pages: 245-261

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Evidence for subduction-related components in the subcontinental mantle from low ^3He/^4He and ^<40>Ar/^<36>Ar ratio in mantle xenoliths from Far Eastern Russia2004

    • Author(s)
      Yamamoto, J., Kaneoka, I., Nakai, S., Kagi, H., Prikhod'ko, V.S., Arai, S.
    • Journal Title

      Chem.Geol. 207

      Pages: 237-259

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Noble gas and carbon isotopes of fumarolic gas from Iwoima volcano, Izu-Ogasawara arc, Japan : implications for the origin of unusual arc magmatism2004

    • Author(s)
      Sumino, H., Notsu, K., Nakai, S., Sato, M., Nagao, K., Hosoe, M., Wakita, H.
    • Journal Title

      Chem.Geol. 209

      Pages: 153-173

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Evaluation of chlorine isotope blank in Cl-37/Cl-35 isotopic measurements using thermal ionization mass spectrometry2004

    • Author(s)
      Miyata, Y., Nakai, S., Yoneda, S.
    • Journal Title

      Bull.Natn.Sci.Mus., Tokyo, Ser.E 27

      Pages: 21-26

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Lithium isotopic systematics of the mantle-derived ultramafic xenoliths : implications for EM1 origin2004

    • Author(s)
      Nishio, Y., Nakai, S., et al.
    • Journal Title

      Earth Planet.Sci.Lett. 217

      Pages: 245-261

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Evidence for subduction-related components in the subcontinental mantle from low ^3He/^4He and ^<40>Ar/^<36>Ar ratio in mantle xenoliths from Far Eastern Russia2004

    • Author(s)
      Yamamoto, J., Kaneoka, I, Nakai, S., et al.
    • Journal Title

      Chem.Geol. 207

      Pages: 237-259

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Noble gas and carbon isotopes of fumarolic gas from Iwoima volcano, Izu-Ogasawara arc Japan implications for the origin of unusual arc magnatism2004

    • Author(s)
      Sumino, H., Notsu, K., Nakai, S., et al.
    • Journal Title

      Chem.Geol. 209

      Pages: 153-173

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Evaluation of chlorine isotope blank in Cl-37/Cl-35 isotopic measurements using total evaporation thermal ionization mass spectrometry2004

    • Author(s)
      Miyata, Y., Nakai, S., Yoneda, S.
    • Journal Title

      Bull.Natn.Sci.Mus.,Tokyo, Ser.E 27

      Pages: 21-26

    • Related Report
      2004 Annual Research Report
  • [Publications] 中井 俊一: "自然界の元素の同位体組成変化"化学と教育. 51(3). 172-173 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] Nishio, Y., Nakai, S., et al.: "Lithium isotopic systematics of the mantle-derived ultramafic xenoliths : implications for EM1 origin"Earth Planet.Sci.Lett.. 217. 245-261 (2004)

    • Related Report
      2003 Annual Research Report
  • [Publications] S.Nakai, Y.Maeda, S.Nakada: "Common origin of plagioclase in last three eruptions of Unzen volcano, Japan"Geochim.Cosmochim.Acta., Spec.Suppl.. A323 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] 中井 俊一: "地球化学講座3, マントル・地殻の地球化学(2.2.2項, 第5章分担執筆)"培風館. 309 (2003)

    • Related Report
      2003 Annual Research Report

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Published: 2003-04-01   Modified: 2016-04-21  

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