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Sr・Nd isotopic study on basaltic rocks from the Chubu District

Research Project

Project/Area Number 02640625
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 InstitutionToyama University

Principal Investigator

UJIKE Osamu  Toyama Univ., Faculty of Science, Aaaoc. Prof., 理学部, 助教授 (10176662)

Project Period (FY) 1990 – 1991
Project Status Completed (Fiscal Year 1991)
Budget Amount *help
¥1,900,000 (Direct Cost: ¥1,900,000)
Fiscal Year 1991: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1990: ¥1,300,000 (Direct Cost: ¥1,300,000)
KeywordsStrontium Isotope / Neodymium Isotope / Chubu District / Ueno Basaltic Rocks / On-take Volcano / Ryohaku Mountains / Mt. Kunimi-dake / Tojimbo / 玄武岩 / 同位体組成 / マグマ / マントル
Research Abstract

(1) The Ueno and On-take basaltic rocks
Ten samples of the Ueno basaltic rocks (2.7-0.9 Ma) have ^<87>Sr/ ^<86>Sr-0.7055-0.7070 and epsilon _<nd>-+3.3-1.1, and show no specific secular variation in isotpic compositions. The Ueno samples are higher in ^<87>Sr/ ^<86>Sr than basaltic rocks from the On-take volcano (<0.8 Ma) which lie within the mantle array on an epsilon _<nd>-^<87>Sr/ ^<86>Sr diagram. Because (1) the Ueno and On-take basaltic rocks were formed in the same area and (2) the difference in their ^<87>Sr/ ^<86>Sr cannot be ascribed to possible contamination by the crust, some episode (arrival of the leading edge of the subducting Philippine Sea plate?) seems to have occurred at 1+alpha Ma in the upper-mantle beneath central Japan.
(2) The Jizo-toge andesitic rocks
The Jizotoge andesitic rocks, formed at -2 Ma nearby the Ueno basaltic rocks, bear epsilon _<nd>-^<87>Sr/ ^<86>Sr relations similar to that of the Ueno basaltic rocks. The epsilon _<nd> and ^<87>Sr/ ^<86>Sr compositions of magmas generated at -2 Ma in this area seem to be insignificantly affected by the crustal material.
(3) Volcanic rocks from the Ryohaku Mountains and Fukui Prefecture
The epsilon _<nd>-^<87>Sr/ ^<86>Sr relations of volcanic rocks from the Ryohaku Mountains (Mts. Gankyoji-yama, Dainichiga-take, Kyoga-take and Bishamon-dake) and Fukui Prefecture (Mt. Kunimi-dake and Tojimbo) are largely similar to that of the Ueno basaltic rocks, but they show a greater scatter trending towards a higher ^<87>Sr/ ^<86>Sr and lower epsilon _<nd> direction.

Report

(3 results)
  • 1991 Annual Research Report   Final Research Report Summary
  • 1990 Annual Research Report
  • Research Products

    (11 results)

All Other

All Publications (11 results)

  • [Publications] 氏家 治: "姫島火山岩のストロンチウム同位体組成ーマグマの混合および非平衡なホルンブレンド斑晶ー" 岩鉱. 86. 65-71 (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] 氏家 治: "上野玄武岩類のKーAr年代" 岩鉱. 87. (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] UJIKE,O.: "Geochemistry of Miocene basaltic rocks formed before and after the rifting of lithosphere at Akita-Yamagata area,Northeast Japan" Chem.Geol.

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] UJIKE, O.: "Strontium isotope compositions of Hime-shima volcanic rocks : magma mixing and disequilibrium hornblende." J. Miner. Petrol. Econ. Geol.86. 65-71 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] UJIKE, O.: "K-Ar ages of the Ueno basaltic rocks." J. Miner. Petrol. Econ. Geol.87. (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] UJIKE, O.: "Geochemistry of Miocene basaltic rocks formed after and before the rifting of lithosphere at Akita-Yamagata area, Northeast Japan." Chem. Geol.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] 氏家 治: "姫島火山岩のストロンチウム同位体組紀ーマグマの混合および非平衡なホルンブレンド斑晶ー" 岩鉱. 86. 65-71 (1991)

    • Related Report
      1991 Annual Research Report
  • [Publications] 氏家 治: "上野玄武岩類のKーAr年代" 岩鉱. 87. (1992)

    • Related Report
      1991 Annual Research Report
  • [Publications] UJIKE,O.: "Geochemistry of Miocene basaltic rocks formed before and after the rifting of lithosphere at AkitaーYamagata area,North east Japan" Chem.Geol.

    • Related Report
      1991 Annual Research Report
  • [Publications] 氏家 治: "地球化学的判別図によるマグマ型の推定ー東北日本中新世玄武岩類への適用例ー" 火山,第2集. 34. S157-S168 (1990)

    • Related Report
      1990 Annual Research Report
  • [Publications] 氏家 治: "“上野玄武岩類ー非島弧的火成活動の産物ー(氏家,1989)"の訂正" 岩鉱. 85. 34-36 (1990)

    • Related Report
      1990 Annual Research Report

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Published: 1990-04-01   Modified: 2016-04-21  

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