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palaeoarchaean

Geological Magazine (1)

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Possible juvenile Palaeoarchaean TTG magmatism in eastern India and its constraints for the evolution of the Singhbhum craton
JENNIFER TAIT, UDO ZIMMERMANN, TAKASHI MIYAZAKI, SERGEY PRESNYAKOV, QING CHANG, JOYDIP MUKHOPADHYAY, SERGEY SERGEEV
Journal:

Geological Magazine / Volume 148 / Issue 2 / March 2011

Published online by Cambridge University Press:

26 November 2010, pp. 340-347
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High-precision SHRIMP U–Pb zircon dating yields a late Palaeoarchaean age (3290 ± 8.6 Ma) for a large, unmetamorphosed, weakly peraluminous TTG body (the Keonjhargarh–Bhaunra pluton) in the Singhbhum craton of eastern India. One inherited subhedral zircon grain gave a concordant age of 3495.9 ± 5.3 Ma and Nd isotope characteristics show a juvenile trend with εNdt ~ 0 and TDM 3395–3453 Ma. The data support a model of typical Archaean crustal evolution until late Palaeoarchaean times for the Singhbhum craton, which is in contrast to the more southerly Bastar craton where Palaeoarchaean non-TTG granites have been identified. These data demonstrate the diachronous development of continental crustal blocks now forming the basement of the eastern and central peninsular of India.