• Petrology, geochemistry and geochronology of Neoarchean A-type granite from Alwar Basin, North Delhi Terrane, NW India

    • Fulltext


        Click here to view fulltext PDF

      Permanent link:

    • Keywords


      Jhiri granite; Neoarchean granites; A-type; North Delhi Terrane; Alwar Basin; age of Delhi sediments

    • Abstract


      A 2.53 Ga old Jhiri granite has been dated using zircon U–Pb systematics from the lowermost succession of North Delhi Terrane (NDT). The granite is an intrusive into the rocks of meta-volcano sedimentary sequence of basal Raialo Group of the Delhi Supergroup. Geochemically, the pluton is peraluminous, magnesian, alkali-calcic to alkali in character with strong negative anomaly for Ba, Ta, P and Ti and positive anomaly for K, Pb and Th. The plots on tectonic discrimination diagrams show the Jhiri granite to be of A-type with an affnity to the volcanic arc related granitoids. The comparison of Jhiri pluton with other Neoarchean granitoids of the Aravalli Delhi Mobile Belt (ADMB) and Bundelkhand craton shows the granite to be more evolved and have strong depletions for HREEs with $\rm{(La/Yb)_{N}}$ > 20. A hybrid source, having component of fractional crystallization-derived mafic melt mixing with melt generated by partial melting of early formed felsic crust in a back-arc extension or post-orogenic extension setting is proposed as the possible scenario for the generation and emplacement of Jhiri pluton.

    • Author Affiliations



      1. Geological Survey of India, Western Region, 15-16 Jhalana Dungri, Jaipur 302 004, India
    • Dates

  • Journal of Earth System Science | News

    • Editorial Note on Continuous Article Publication

      Posted on July 25, 2019

      Click here for Editorial Note on CAP Mode

© 2021-2022 Indian Academy of Sciences, Bengaluru.