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Constrains on mantle recycling procedures at continental margins by Pb-Nd-Sr isotopic compositions

Research Project

Project/Area Number 03640667
Research Category

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

Allocation TypeSingle-year Grants
Research Field 鉱物学(含岩石・鉱床学)
Research InstitutionUtsunomiya University

Principal Investigator

NAKAMURA Yoichi  Utsunomiya University, Faculty of Education Associate professor, 教育学部, 助教授 (10114167)

Project Period (FY) 1991 – 1992
Project Status Completed (Fiscal Year 1992)
Budget Amount *help
¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 1992: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1991: ¥1,500,000 (Direct Cost: ¥1,500,000)
KeywordsIsland-arc / Back-arc basin / Yamato seamount / Subduction system / Mantle-array / Dupal anomaly / Isotopic composition / Quaternary volcanic rocks / 第四紀火山岩 / 火山岩 / マントル / バルクア-ス / ウツリョウ島 / 竹島
Research Abstract

Volcanic rocks from the eastern Eurasian plate margin (southwestern Japan, the Sea of Japan, and northeastern China) show enriched (EMI) component signatures. Volcanic rocks from the Ulreung and Dog Islands in the Sea of Japan show typical DUPAL anomaly characteristics wit extremely high delta 208/204 Pb (up to 143) and enriched Nd and Sr isotopic compositions (eNd = -3 to 5, 87Sr/86Sr = -0.705). The delta 208/204 Pb values are similar to those associated with the DUPAL anomaly (up to 140) in the southern hemisphere. Because the EMI characteristics of basalts from the Sea of Japan are more extreme than those of southwestern Japan and inland China basalts, we propose that old mantle lithosphere was metasomatized early (prior to the Proterozoic) with subduction-related fluids (not present subduction system) so that it has been slightly enriched in incompatible elements and has had a high Th/U for a long time. The result of this study support the idea that the old subcontinental mantle lithosphere is the source for EMI of oceanic basalts, and that EMI does not need to be stored at the core/mantle boundary layer for a long time. Dredged samples form seamounts and knolls form the Yamato Basin Ridge in the Sea of Japan show similar isotopic characteristics to basalts from the Marina arc, supporting the ida that the Yamato Basin Ridge is a spreading center causing separation of the northeast Japan Arc form Eurasia.

Report

(3 results)
  • 1992 Annual Research Report   Final Research Report Summary
  • 1991 Annual Research Report
  • Research Products

    (17 results)

All Other

All Publications (17 results)

  • [Publications] TATUMOTO,M.and NAKAMURA,Y: "DUPAL anomaly in the Ses of japan:Pb,Nd,and Sr isotopic variations at the Eurasian continental margin." Geochimica et Cosmochimica Acta. 55. 3697-3708 (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] 中村 洋一,増渕 亮二,緒方 和徳,青島 睦治: "袈裟丸火山の地質と岩石" 栃木県立博物館研究報告書. 10. 29-48 (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] TATUMOTO,M.,NAKAMURA,Y.Basu.A.R.: "Euriched mantle lithosphere at the eastern Eurasian continental margin." International Geological Congress,Abstract volume. 29-2. 545 (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] HASENAKA,T.,Ui,T.,NKAMURA,Y.and HYASHI,S.: "Traverse of Quaternary volcanoes in northeast Japan,Volcanoes and geothermal fields of Japan,IGC Field Trip Guide Book,vol.4." Geological Survey of Japan,Tsukuba, 45 (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] Tatsumoto, M. and Nakamura, Y.: "DUPAL anomaly in the Sea of Japan: Pb, Nd, and Sr isotopic variations at the eastern Eurasian continental margin." Geochimica et Cosmochimica Acta. vol.55. 3697-3708 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] Nakamura, Y., Masubuchi, R., Shiozawa, S., Ogata, K., and Aoshima, M.: "Geology and Petrology of Kesamaru volcano, Japan.in Japanese with English abstract" Memoirs of Tochigi Prefectural Museum. no.10. 29-48 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] Hasenaka, T., Ui, T., Nakamura, Y., and Hayashi, S.: "Traverse of Quaternary volcanoes in northeast Japan, Volcanoes and geothermal fields of Japan." IGC Fieldtrip Guidebook. vol.4.29-74 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] Tatsumoto, M., Nakamura, Y, and Basu, A. R.: "Enriched mantle lithosphere at the eastern Eurasian continental margin." International Geological Congress, Abstract volume. 29-2. 545 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] Tatsumoto,M.and Nakamura,Y.: "DUPAL anomaly in the Sea of Japan:Pb,Nd,and Sr isotopic variation variations at the eastern Eurasian continental margin." Geochimica et Comsmochimica Acta. 55. 3697-3708 (1991)

    • Related Report
      1992 Annual Research Report
  • [Publications] 中村 洋一・増渕 亮二・緒方 和徳・青島 睦治: "袈裟丸火山の地質と岩石" 栃木県立博物館研究報告書. 10. 29-48 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] Tatsumoto,M.,Nakamura,Y.Basu.A.R.: "Enriched mantle lithosphere at the eastern Eurasian continental margin." International Geological Congress,Abstract volume. 29-2. 545- (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] Hasenaka,T.,Ui,T.,Nakamura,Y.and Hyashi,S.: "Traverse of Quaternary volcanoes in northeast Japan,Volcanoes and geothermal fields of Japan,IGC Field Trip Guide Book,vol.4." Geological Survey of Japan,Tsukuba, 45 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] 中村 洋一: "磐梯山の明治21年噴火とその災害" 地図ニュ-ス. 91ー10. 12-15 (1991)

    • Related Report
      1991 Annual Research Report
  • [Publications] Tatsumoto,M.and Nakamura,Y.: "DUPAL anomaly in the Sea of Japan:Pb,Nd,and Sr isotopic variations at the eastern Eurasian Continental." Geochimica et Cosmochimica Acta. 55. 3697-3708 (1991)

    • Related Report
      1991 Annual Research Report
  • [Publications] Nakamura,Y.et.al.: "Blast and debris avalanche deposits of the 1888 eruption of Bandai volcano,Japan." Procedings of International Geological Congress,1992. (1992)

    • Related Report
      1991 Annual Research Report
  • [Publications] Tatsumoto,M.,Nakamura,Y.,and Basu.,A.R.: "Enrich Mantle Lithospere at the Eastern Eurasia Continental Margin." Proceedings of International Geological Congress,1992. (1992)

    • Related Report
      1991 Annual Research Report
  • [Publications] Nakamura,Y.,and Glicken,H.: "Debris avalanche and blast deposits from 1888 eruption of Bandai volcano,Japan." Journal of Volcanology and Geothermal Research. (1992)

    • Related Report
      1991 Annual Research Report

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Published: 1991-04-01   Modified: 2016-04-21  

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