• Sr isotopic evidence on the spilitic degradation of the Deccan basalt

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    • Keywords

       

      Spilites; Deccan basalt; Sr isotopes

    • Abstract

       

      Similar Sr isotopic ratios (∼ 0.7055) for the tholeiite-spilite flow unit and the associated mineral phases, of Bombay (Deccan Traps) provide a direct evidence for the spilitic degradation of tholeiite. In contrast, a dramatic increase in the rare earth elements (REE) from basalt to spilite is rather puzzling as rare earths are considered to be relatively immobile. The geochemistry thus suggests that the process of spilitization is due to the reaction with a complex fluid having identical Sr-isotopic composition as that of the basaltic magma—thereby masking the details of the mixing process.

    • Author Affiliations

       

      K V Subbarao1

      1. Department of Earth Sciences, Indian Institute of Technology, Mumbai (Bombay) - 400 076, India
    • Dates

       
  • Journal of Earth System Science | News

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