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Possible juvenile Palaeoarchaean TTG magmatism in eastern India and its constraints for the evolution of the Singhbhum craton

Published online by Cambridge University Press:  26 November 2010

JENNIFER TAIT*
Affiliation:
School of GeoSciences, University of Edinburgh, Grant Institute, The King's Buildings, Edinburgh EH9 3JW, United Kingdom
UDO ZIMMERMANN
Affiliation:
University of Stavanger, Faculty of Science and Technology, Department of Petroleum Engineering, 4036 Stavanger, Norway
TAKASHI MIYAZAKI
Affiliation:
Institute for Research on Earth Evolution, JAMSTEC, 2–15 Natsushima-cho, Yokosuka 237-0061, Japan
SERGEY PRESNYAKOV
Affiliation:
Centre of Isotopic Research, All-Russian Geological Research Institute (VSEGEI), 74 Sredny Prospect, 199106 St Petersburg, Russia
QING CHANG
Affiliation:
Institute for Research on Earth Evolution, JAMSTEC, 2–15 Natsushima-cho, Yokosuka 237-0061, Japan
JOYDIP MUKHOPADHYAY
Affiliation:
Department of Geology, Presidency College, Kolkata, India
SERGEY SERGEEV
Affiliation:
Centre of Isotopic Research, All-Russian Geological Research Institute (VSEGEI), 74 Sredny Prospect, 199106 St Petersburg, Russia
*
Author for correspondence: [email protected]

Abstract

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.

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Rapid Communication
Copyright
Copyright © Cambridge University Press 2010

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