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      https://www.ias.ac.in/article/fulltext/jess/127/04/0052

    • Keywords

       

      Neoproterozoic W deposit; Degana and Balda granites; fluid inclusion; geochronology; Aravalli craton; Rodinia.

    • Abstract

       

      Granitic plutons occurring within and to the west of the Delhi Fold Belt in the Aravalli craton, northwestern India are the result of widespread felsic magmatism during Neoproterozoic, some of which are associated with greisen and skarn tungsten deposits. In this paper, we present the result of our study on fluid inclusions, geochemistry and geochronology of two such tungsten mineralized granite plutons at Degana and Balda, and interpret the nature of ore fluid, and petrogenesis and age of these mineralized granites. Fluid inclusion study reveals coexistence of moderate and hyper-saline aqueous fluid inclusions along with aqueous-carbonic inclusions, suggesting their origin due to liquid immiscibilityduring fluid–rock interaction. Geochemically, the granites are peraluminous, Rb enriched, Sr and Ba depleted and highly differentiated. The Rb–Sr isotopic systematics yielded 795±11 Ma for Balda granite and 827 ± 8 Ma for Degana granite. We show that major phase of widespread granitoid magmatismand mineralization during the Neoproterozoic (840–790 Ma) in NW India is coeval with breakup of the Rodinia supercontinent and infer a causal relationship between them.

    • Author Affiliations

       

      Sundarrajan Vijay Anand1 2 M S Pandian1 S Balakrishnan1 R Sivasubramaniam1 3

      1. Department of Earth Sciences, Pondicherry University, Kalapet, Puducherry 605 014, India.
      2. Department of Earth Sciences, Eritrea Institute of Technology, Asmara 126 76, Eritrea.
      3. AMD for Exploration and Research, Nagarbhavi, Bengaluru 560 072, India.
    • Dates

       
  • Journal of Earth System Science | News

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