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Geochemical and U–Pb zircon age characterization of granites of the Bathani Volcano Sedimentary sequence, Chotanagpur Granite Gneiss Complex, eastern India: vestiges of the Nuna supercontinent in the Central Indian Tectonic Zone

By
Ashima Saikia
Ashima Saikia
Department of Geology, University of Delhi, Delhi 110007, India
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Bibhuti Gogoi
Bibhuti Gogoi
Department of Geology, University of Delhi, Delhi 110007, India
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Tatiana Kaulina
Tatiana Kaulina
Geological Institute, Kola Science Centre of Russian Academy of Sciences, 14 Fersman Street, Apatity 184209, Russia
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Liudmila Lialina
Liudmila Lialina
Geological Institute, Kola Science Centre of Russian Academy of Sciences, 14 Fersman Street, Apatity 184209, Russia
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Tamara Bayanova
Tamara Bayanova
Geological Institute, Kola Science Centre of Russian Academy of Sciences, 14 Fersman Street, Apatity 184209, Russia
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Mansoor Ahmad
Mansoor Ahmad
Geological Survey of India, Rajabazar, Patna 800020, India
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Published:
January 01, 2017

Abstract

The Central Indian Tectonic Zone (CITZ) marks the suture zone where the North and South Indian cratonic blocks amalgamated to form the Greater Indian Landmass (GIL). It consists of three broad domains from west to east: the central CITZ occupying the central region of mainland India juxtaposed between two mobile belts, namely the Sausar Mobile Belt (SMB) in the south and the Mahakoshal Mobile Belt (MMB) in the north; the Chotanagpur Granite Gneiss Complex (CGGC) lying east of the main CITZ; and the easternmost Shillong Plateau Gneissic Complex (SPGC). The studied granites are from the Bathani Volcano Sedimentary sequence (BVSs) from the northern margin of the CGGC. These are high-K, calc-alkaline, I-type granites related to arc magmatism and are interpreted to have formed by partial melting of an igneous source at upper-crustal depths. The granitic magma underwent extensive fractional crystallization of plagioclase, biotite, K-feldspar and ilmenite during emplacement. The U–Pb (ID-TIMS) zircon emplacement age is c. 1.7–1.6 Ga for these granites. This episode of magmatism can be correlated to the global event of the Nuna supercontinent assembly also reported from the MMB of the central CITZ. We infer that the BVSs is the eastern continuation of the MMB of the central CITZ.

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Contents

Geological Society, London, Special Publications

Crustal Evolution of India and Antarctica: The Supercontinent Connection

N. C. Pant
N. C. Pant
University of Delhi, India
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S. Dasgupta
S. Dasgupta
Jamia Millia Islamia, India
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The Geological Society of London
Volume
457
ISBN electronic:
9781786203380
Publication date:
January 01, 2017

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