• Fulltext

       

        Click here to view fulltext PDF


      Permanent link:
      https://www.ias.ac.in/article/fulltext/jess/088/01/0007-0017

    • Keywords

       

      Rb-Sr age; isochron; granite; precambrian

    • Abstract

       

      Rubidium and strontium determinations are reported for Godhra and geographically related granites from central Gujarat. The whole rock data define a Rb-Sr isochron corresponding to a common age of 955±20 m.y. and initial Sr ratio of 0·7130±0·001. This age is distinctly older than the age of 735 m.y. reported for the Erinpura suite of rocks from Mount Abu in western Rajasthan and from Idar in northern Gujarat. There are at least two generations of post-Delhi intrusive rocks in the Gujarat precambrian. Biotites associated with these granites have the same age as the whole-rocks within experimental error indicating the absence of significant metamorphic heating since the time of emplacement. It is significant that rocks of similar age occur in the Rajasthan Precambrian mainly in the axial zone of the Aravalli Mountains.

    • Author Affiliations

       

      K Gopalan1 J R Trivedi1 S S Merh2 P P Patel2 S G Patel2

      1. Physical Research Laboratory, Ahmedabad - 380 009
      2. Department of Geology, M.S. University of Baroda, Baroda - 390 002
    • Dates

       
  • Journal of Earth System Science | News

© 2017-2019 Indian Academy of Sciences, Bengaluru.