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Geochemistry and petrogenesis of 2.8 Ga old rare metal bearing fertile granite at Allapatna, Mandya district, Karnataka

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Journal of the Geological Society of India

Abstract

This paper reports petrography, geochemistry and Rb-Sr age data on the rare metal bearing Neoarchean fertile (Nb-Ta) granite at Allapatna and elucidates its petrogenesis and role in Nb-Ta-Li-Be mineralization. The Allapatna granite (AG) intrudes the Tonalitic-Trondhjemitic - Granodioritic (TTG) Peninsular Gneiss and analysed SiO2 (72.3-75.6 wt%), K2O (4.0-5.7wt%), Na2O (3.0-4.4wt%), CaO (0.7-1wt%), MgO (0.13-0.25wt%) and K2O/Na2O (>1) indicating evolved nature. The presence of muscovite, biotite and garnet in the mode, peraluminous nature and high initial 87Sr/86Sr ratio (0.7284±0.0083) attest to their S-type characteristics. Varying Nb/Ta ratio and high Li with moderate abundance of Cs further indicate affinity to Li-Cs-Ta (LCT) type granite-pegmatite system. TheAG showing whole rock Rb-Sr isochron age of 2803± 68 Ma, is the oldest reported fertile granite in India parental to rare metal pegmatites hosting Nb-Ta, Be, and Li resources. Partial melting of a mixed source consisting of both basement TTG rocks and metapelites has generated such type of granitic magma. Fractionation of such granitic magma possibly has given rise to the rare metal (Ta-Nb-Li-Be) bearing pegmatites intruding the nearby schist belt.

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Authors and Affiliations

  1. Department of Atomic Energy, Atomic Minerals Directorate for Exploration and Research, Nagarbhavi, Bengaluru, 560 072, India

    Chanchal Sarbajna

  2. Department of Atomic Energy, Atomic Minerals Directorate for Exploration and Research, Begumpet, Hyderabad, 500 016, India

    U. K. Pandey

  3. Department of Atomic Energy, Atomic Minerals Directorate for Exploration and Research, No.63, 12th Cross, Basappa Layout, Bengaluru, 560 019, India

    P. Krishnamurthy

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  1. Chanchal Sarbajna
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  2. U. K. Pandey
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Correspondence to Chanchal Sarbajna.

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Sarbajna, C., Pandey, U.K. & Krishnamurthy, P. Geochemistry and petrogenesis of 2.8 Ga old rare metal bearing fertile granite at Allapatna, Mandya district, Karnataka. J Geol Soc India 91, 67–75 (2018). https://doi.org/10.1007/s12594-018-0821-1

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