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Geochemistry and Petrogenesis of the Danduvaripalle syenites, Eastern Dharwar Craton, southern India

  • Unique Paper ID: 168166
  • Volume: 11
  • Issue: 5
  • PageNo: 182-188
  • Abstract:
  • The Eastern Dharwar Craton (EDC) contains many Late Neoarchean to Paleoproterozoic syenites, whose origin is ambiguous. This work presents a geochemical analysis of the Danduvaripalle syenites (DVS), located at the western boundary of the Paleo-Mesoproterozoic Cuddapah Basin in the Eastern Deccan (EDC). The DVS has a metaluminous, alkaline, and magnesian geochemical composition. These metaluminous rocks are characterized by high overall alkali content, particularly K2O, moderate FeOt levels, and low MnO, MgO, and CaO concentrations. The chondrite-normalized REE patterns demonstrate LREE enrichment relative to HREE, with no Eu anomaly seen. Allanite, apatite, zircon, and monazite are the accessory minerals that contain substantial amounts of LREE in these syenites. The syenites lack MgO, Ni, Cr, and Sc, possess highly fractionated REE patterns, and have negative Nb–Ta–Ti anomalies, with low Nb/U and elevated Th/U ratios, indicating a subduction zone environment. The Danduvaripalle syenite has geochemical affinities with arc-related alkaline rocks and volcanic arc granitoids in tectonic discrimination diagrams. These geochemical characteristics align with their formation by partially melting a mafic crustal source, which later saw fractionation of amphibole and garnet. We propose that the crustal source of these syenites experienced partial melting due to thermal influence from the ascending plume during the Paleoproterozoic expansion.
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  • ISSN: 2349-6002
  • Volume: 11
  • Issue: 5
  • PageNo: 182-188

Geochemistry and Petrogenesis of the Danduvaripalle syenites, Eastern Dharwar Craton, southern India

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