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Geochronological research about the relation of Proterozoic rocks, western of Kolkata, with 1700Ma rocks in Nepal.

Research Project

Project/Area Number 15540441
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Geology
Research InstitutionKanto Gakuen University

Principal Investigator

TAKIGAMI Yutaka  Kanto Gakuen Univ., Department of Law, Professor, 法学部, 教授 (40206909)

Co-Investigator(Kenkyū-buntansha) SAKAI Harutaka  Kyushu Univ., Graduate School of Social and Cultural Studies, Professor, 大学院・比較社会文化研究院, 教授 (90183045)
ORIHASHI Yuji  Tokyo Univ., Earthquke Inst., Assistant, 地震研究所, 助手 (70313046)
Project Period (FY) 2003 – 2005
Project Status Completed (Fiscal Year 2005)
Budget Amount *help
¥2,400,000 (Direct Cost: ¥2,400,000)
Fiscal Year 2005: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 2004: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 2003: ¥1,400,000 (Direct Cost: ¥1,400,000)
Keywords40Ar-39Ar age / Rare Earth Element / Spidergram / 1700Ma / Proterizoic / Nepal / International reserch / India / スパーダーグラム / Rb-Sr年代 / Nd-Sm年代 / 国際研究者交流
Research Abstract

In peninsular India, there are Proterozoic Lavas extending large area. The ages of these rocks are reported 1500-1600 Ma by K-Ar and Rb-Sr dating methods and we have reported the relation of these rocks to the Dwar Khola dolerite (1600-1800Ma 40Ar-39Ar ages) from Siwalik of Sub-Himalaya, situated about 400km north, before. We have collected these samples in 2003 and report 40Ar-39Ar age results in this paper.
These volcanic rocks are situated in the Proterozoic metamorphic and granitic rocks and divided 4 parts ((Dalma, Dhanjori and Jagarnathpur, Ongabila). Plateau ages about 1700-1800 Ma as those of Nepal dolerites cannot be obtained.
All age spectrum show disturbed pattern by metamorphism or excess Ar pattern.
From these results, we conclude 5 ages for these volcanic rocks.
1)1800-2000Ma ; original age same as those of Nepal Dolerites.
2)1550-1670Ma ; original age or metamorphic age
3)1400Ma ; metamorphic age
4)950-1050Ma ; metamorphic age which is recognized in intruded rocks in Napier Complex, Antarctica.
5)450-550Ma ; metamorphic age corresponding to the Pan African Metamorphism.

Report

(4 results)
  • 2005 Annual Research Report   Final Research Report Summary
  • 2004 Annual Research Report
  • 2003 Annual Research Report
  • Research Products

    (4 results)

All 2005 2004

All Journal Article (4 results)

  • [Journal Article] Geology of the summit imestone of Mount Qomolamgma(Everest) and coolong history under Qomolamgma detachment2005

    • Author(s)
      Sakai, Takigami, et al.
    • Journal Title

      The Island Arc 14

      Pages: 297-310

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Geology of the summit limestone of Mount Qomolangma (Everest) and cooling history under the Qomolamgma detachment2005

    • Author(s)
      Sakai, Takigami, et al.
    • Journal Title

      The Island Arc 14

      Pages: 297-310

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Geology of the summit limestone of Mount Qomolangma(Everest) and cooling history under the Qomolangma detachment2005

    • Author(s)
      Sakai, Takigami et al.
    • Journal Title

      The Island Arc 14

      Pages: 297-310

    • Related Report
      2005 Annual Research Report
  • [Journal Article] 40Ar-39Ar dating of Proterozoic basaltic and granitic rocks in the Nepal Himalaya and their comparison with those in Singbhum area, peninsular India2004

    • Author(s)
      Y.Takigami, H.Sakai, Y.Orihashi, K.Yokoyama
    • Journal Title

      Himalayan Journal of Sciences Vol.2

      Pages: 260-260

    • Related Report
      2004 Annual Research Report

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

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