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      Permanent link:
      https://www.ias.ac.in/article/fulltext/jess/097/01/0107-0114

    • Keywords

       

      Cretaceous dykes; Deccan volcanism; geochronology; geochemistry; Palaeomagnetism

    • Abstract

       

      Palaeomagnetic, geochemical and geochronological studies have been conducted on a set of dolerite dykes intruding the Peninsular gneisses near Huliyurdurga town, Karnataka, as a reconnaissance survey indicated a Cretaceous age for them. The dykes are mainly tholeiitic in composition with their 87Sr/86Sr ratios tightly clustered around 0·7045. Their palaeomagnetic data (Dm=329°,Im=−55°) and the corresponding palaeopole coordinates (λp = 34°S,Lp=108°E) are strikingly close to those of the Deccan Traps to the north. Whole rock K-Ar ages of these dykes ranging between 69 and 84 Ma are also similar to the range of K-Ar ages of the Deccan basalts. The chemical, palaeomagnetic and temporal coherence between the dykes and the Deccan basalts indicate that they may indeed be tectonically related events.

    • Author Affiliations

       

      Anil Kumar1 Y J Bhaskar Rao1 V M Padma Kumari1 A M Dayal1 K Gopalan1

      1. National Geophysical Research Institute, Hyderabad - 500007, India
    • Dates

       
  • Journal of Earth System Science | News

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