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Evidence for Neoarchean basement for the Deccan Volcanic flows around Koyna-Warna region, western India: Zircon U-Pb age and Hf-isotopic results

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Journal of the Geological Society of India

Abstract

Deep boreholes around the Koyna-Warna seismic zone in the southwestern part of the Deccan Volcanic Province (DVP) enable a rare access to the basement beneath the thick (typically 1-2 km) lava pile, the nature of which has been enigmatic for long. Utilizing the drill core from borehole KBH-1 near Rasati village, we present here in situ Laser Ablation — Inductively Coupled Plasma Mass Spectrometry (LA-ICPMS) and LA-MC (multi collector)-ICPMS zircon U-Pb age and Hf-isotopic composition for two samples along with a brief description of the petrology and geochemistry of the representative lithounits of the basement section. The KBH-1 basement section comprises predominantly grey migmatite gneisses of granodiorite, tonalite and quartz monzodiorite composition apart from minor pink monzogranite. The grey gneisses show geochemical affinity to Neoarchean Tonalite-Trondhjemite-Granodiorite (TTG) suites and modern calc-alkalic granitoids. Zircons from a granodiorite and a monzogranite samples yield consistent U-Pb ages of 2710±63 Ma and 2700±49 Ma (2σ errors). The initial 176Hf/177Hf values lie in a narrow range (0.281162 to 0.281283) corresponding to εHf(T) values of +3.7 to +8.0 indicating that the magmatic precursors of the KBH-1 gneisses represent juvenile magmatism around 2700 Ma. In terms of the composition and age, a correlation between the gneisses in the KBH-1 borehole and the Neoarchean basement gneisses of the Eastern Dharwar Craton (EDC) is emphasized arguing for the extension of the EDC to the Koyna-Warna region.

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  1. CSIR-National Geophysical Research Institute, Uppal Road, Hyderabad, 500 007, India

    Y. J. Bhaskar Rao, B. Sreenivas, T. Vijaya Kumar, Namrata Khadke, A. Kesava Krishna & E. V. S. S. K. Babu

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Bhaskar Rao, Y.J., Sreenivas, B., Vijaya Kumar, T. et al. Evidence for Neoarchean basement for the Deccan Volcanic flows around Koyna-Warna region, western India: Zircon U-Pb age and Hf-isotopic results. J Geol Soc India 90, 752–760 (2017). https://doi.org/10.1007/s12594-017-0787-4

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