- journal_title：Geological Magazine
- Contributor：JENNIFER TAIT ; UDO ZIMMERMANN ; TAKASHI MIYAZAKI ; SERGEY PRESNYAKOV ; QING CHANG ; JOYDIP MUKHOPADHYAY ; SERGEY SERGEEV
- Publisher：Cambridge University Press
- Date：2011-
- Format：text/html
- Language：en
- Identifier：10.1017/S0016756810000920
- journal_abbrev：Geological Magazine
- issn：0016-7568
- volume：148
- issue：2
- firstpage：340
- section：Rapid Communication
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.