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Geological Study of Deccan Flood Basalts

Research Project

Project/Area Number 04041030
Research Category

Grant-in-Aid for international Scientific Research

Allocation TypeSingle-year Grants
SectionField Research
Research InstitutionUniversity of Tokyo

Principal Investigator

FUJII Toshitsugu  Earthquake Res. Inst., Univ. of Tokyo, Professor, 地震研究所, 教授 (00092320)

Co-Investigator(Kenkyū-buntansha) NAIR K.K.K.  Geological Survey of India, Senior scientist, デカン高原研究部, 主任研究員
CHATTERJEE A.K.  Geological Survey of India, Junior scientist, デカン高原研究部, 研究員
YEDEKAR D.B.  Geological Survey of India, Senior scientist, デカン高原研究部, 主任研究員
DESHMUKH S.S.  Geological Survey of India, Director, デカン高原研究部, 統括部長
YAMASHITA Shigeru  Res. Inst. for Earth's Interior, Okayama Univ., Research Associate, 地球内部研究センター, 助手
YASUDA Atsushi  Earthquake Res. Inst., Univ. of Tokyo, Research Associate, 地震研究所, 助手 (70222354)
KANEKO Takayuki  Earthquake Res. Inst., Univ. of Tokyo, Research Associate, 地震研究所, 助手 (90221887)
UMINO Susumu  Faculty of Science, Shizuoka Univ., Assoc.Professor, 理学部, 助教授 (30192511)
OZAWA Kazuhito  Faculty of Science, Univ. of Tokyo, Assoc.Professor, 理学系研究科, 助教授 (90160853)
ARAMAKI Shigeo  Faculty of Science, Hokkaido Univ., Professor, 理学部, 教授 (60012895)
HAMANO Yozo  Faculty of Science, Univ. of Tokyo, Professor, 理学系研究科, 教授 (90011709)
KANEKOKA Ichiro  Earthquake Res. Inst., Univ. of Tokyo, Professor, 地震研究所, 教授 (30011745)
YEDEKAR D B  インド地質調査所, デカン研究部, 主任研究官
DESHMUKH S S  インド地質調査所, デカン研究部, 部長
Project Period (FY) 1992 – 1993
Project Status Completed (Fiscal Year 1993)
Budget Amount *help
¥20,500,000 (Direct Cost: ¥20,500,000)
Fiscal Year 1993: ¥9,500,000 (Direct Cost: ¥9,500,000)
Fiscal Year 1992: ¥11,000,000 (Direct Cost: ¥11,000,000)
KeywordsFlood Basalt / Basalt Volcanism / Primary Magma / Deccan Plateau / デカン玄武岩 / 噴火機構 / 岩脈
Research Abstract

Field surveys at Deccan Plateau were carried out in three seasons ; January, 1993, October, 1993 and December, 1993 to January, 1994. During the first field season, east-west traverse of the region of Deccan flood basalt was carried out, and the basaltic agglutinates were recognized in the eastern portion of the plateau. This indicates that the eruption center of the flood basalt is not restricted at the western portion of the Deccan plateau. During the second field season, plateau basalt lava was found near Panna area, where no basaltic activity have not been described. This indicates that the distribution of the Deccan flood basalt should be revised to the further north and the erupted volume could be much larger than ever estimated.
During the third field season, two different trends of dikes were recognized ; E-W and N-S. They sometimes cut each other, indicating the two different fissure systems were available during the Deccan plateau volcanism.
More than 300 samples were analyzed with XRF. Most striking feature is that the magnesian basalt which contains more than 9wt % of MgO contains accumulated olivine phenocrysts and that the liquid composition should be less magnesian ; less than 7wt % of MgO. This indicates that the picrite primary magma cannot be the parental magma for the Deccan flood basalt. Also, the chemical trend within the Deccan flood basalt cannot be explained by simple fractional crystallization, but can be explained several different basaltic parental magmas with different alkali and titanium contents. Some of the primitive basaltic rocks were found to show chemical feature which resemble the partial melt of MORBs at high pressure. This may suggest that the source materials for the Deccan flood basalt may not be mantle peridotite, but MORBs which had subducted into the mantle in the much older time.

Report

(2 results)
  • 1993 Final Research Report Summary
  • 1992 Annual Research Report
  • Research Products

    (13 results)

All Other

All Publications (13 results)

  • [Publications] 安田敦・藤井敏嗣: "洪水玄武岩と海台" 月刊「地球」. No.9. 153-158 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Yasuda,A. & Fujii,T.: "Melting phase relations of an anhydrous mid-ocean ridge basalt from 3 to 20 GPa" Jour.Geophys.Res.99(印刷中). (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] 兼岡一郎・Deshmukh,S.S.: "デカン高原の岩脈群とデカン高原玄武岩の噴出年代をめぐる問題" 地球惑星科学関連学会1993年合同大会予稿集. 300 (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] 岩田尚能・兼岡一郎・瀧上豊: "デカン高原岩脈群の^<40>Ar/^<39>Ar年代測定(1)" 日本火山学会講演予稿集(1993年秋季大会). 27 (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] 岩田尚能・兼岡一郎・瀧上豊: "デカン高原岩脈群の^<40>Ar/^<39>Ar年代測定(2)" 地球惑星科学関連学会1994年合同大会. (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Yasuda,A. & Fujii,T.: "Flood basalts and submarine plateau" Monthly "Chikyu". No.9. 153-158 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Yasuda,A. & Fujii,T.: "Melting phase relations of an anhydrous mid-ocean ridge basalt from 3 to 20 GPa." Jour.Geophys.Res.99(in press). (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Kaneoka,I. & Deshmukh,S.S.: "Problems on the ages of dyke swarms and plateau basalts in the Deccan Plateau" 1993 Japan earth and planetary science joint meeting. 300 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Iwata,N., Kaneoka,I., and Takigami,Y.: "^<40>Ar/^<39>Ar dating of dyke swarms in the Deccan traps(1)" Programme and abstracts the volcanological society of Japan. 27 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Iwata,N., Kaneoka,I., Takigami,Y.: "^<40>Ar/^<39>Ar dating of dyke swarms in the Deccan traps(2)" 1994 Japan earth and planetary science joint meeting. (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] KANEOKA,I.and Deshmukh,S.S.: "^<40>Ar-^<39>Ar ages of Deccan basalt dykes" E.P.S.L.(1993)

    • Related Report
      1992 Annual Research Report
  • [Publications] 藤井 敏嗣: "巨大斑晶玄武岩の成因とその意義" 火山. (1993)

    • Related Report
      1992 Annual Research Report
  • [Publications] YASUDA,A.and FUJII,T.: "A genesis of continental flood basalts" E.P.S.L.(1993)

    • Related Report
      1992 Annual Research Report

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Published: 1992-04-01   Modified: 2016-04-21  

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