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Geochemistry and petrogenesis of Proterozoic granitic rocks from northern margin of the Chotanagpur Gneissic Complex (CGC)

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Abstract

This study presents the geochemical characteristics of granitic rocks located on the northern margin of Chotanagpur Gneissic Complex (CGC), exposed in parts of Gaya district, Bihar and discusses the possible petrogenetic process and source characteristics. These granites are associated with Barabar Anorthosite Complex and Neo-proterozoic Munger–Rajgir group of rocks. The granitic litho-units identified in the field are grey, pink and porphyritic granites. On the basis of geochemical and petrographic characteristics, the grey and pink granites were grouped together as GPG while the porphyritic granites were named as PG. Both GPG and PG are enriched in SiO2, K2O, Na2O, REE (except Eu), Rb, Ba, HFSE (Nb, Y, Zr), depleted in MgO, CaO, Sr and are characterised by high Fe* values, Ga/Al ratios and high Zr saturation temperatures (GPGavg∼ 861 ∘C and PGavg∼ 835 ∘C). The REE patterns for GPG are moderately fractionated with an average (La/Yb)N∼ 4.55 and Eu/Eu* ∼ 0.58, than PG which are strongly fractionated with an average (La/Yb)N∼ 31.86 and Eu/Eu* ∼ 0.75. These features indicate that the granites have an A-type character. On the basis of geochemical data, we conclude that the granites are probably derived from a predominant crustal source with variable mantle involvement in a post-collisional setting.

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Acknowledgements

The authors thank the Head of the Department of Geology, University of Delhi for all the facilities provided during this study, especially XRF analysis. We thank Prof. A K Choudhary from IIT Roorkee for ICP-MS analysis. They also thank the editor, Prof. Pulak Sengupta and the anonymous reviewers for their constructive reviews and useful suggestions, which helped in improving the manuscript. We thank all our lab colleagues for their cooperation and support.

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Authors and Affiliations

  1. Department of Geology, University of Delhi, Delhi, 110 007, India

    Bhupendra S Yadav & Talat Ahmad

  2. Department of Geology, Sikkim University, Gangtok, 737 102, India

    Nishchal Wanjari

  3. Jamia Millia Islamia University, New Delhi, Delhi, 110 025, India

    Talat Ahmad

  4. Geological Survey of India, Lucknow, 226 024, India

    Rajesh Chaturvedi

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  1. Bhupendra S Yadav
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Correspondence to Bhupendra S Yadav.

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Corresponding editor: Pulak Sengupta

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Yadav, B.S., Wanjari, N., Ahmad, T. et al. Geochemistry and petrogenesis of Proterozoic granitic rocks from northern margin of the Chotanagpur Gneissic Complex (CGC). J Earth Syst Sci 125, 1041–1060 (2016). https://doi.org/10.1007/s12040-016-0709-7

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