Abstract:
We report new Sm–Nd whole rock-mineral isochron ages of 2514 ± 13 Ma (MSWD = 0.79) and 2651 ± 95
Ma (MSWD = 7.4) from two east coast dykes (ECD) of Southern Granulite Terrain (SGT), India. The
ages from the representative maBc dyke samples correspond to the time of intrusion of ECD into the
eastern part of SGT, indicating the presence of an older Archean crust in SGT near the Pondicherry
coast. The Sm–Nd ages obtained from the present study, along with geochronological information from
Singhbhum Craton, suggest a magmatic linkage between SGT (including southern Dharwar Craton) and
Singhbhum Craton during the Neoarchean period. The older ages obtained from the maBc dykes of the
present study are comparable with the Sm–Nd ages of older maBc dykes from Nuggihalli green stone belt
of Western Dharwar Craton (WDC), Pb–Pb ages of maBc dykes from Singhbhum Craton of India and the
U–Pb ages from Pilbara and Kaapvaal cartons. These comparisons unlock a clue to Neoarchean (2.8–2.5
Ga) paleogeographic reconstructions of Pilbara, Kaapvaal, Singhbhum cratons, northern SGT (including
southern Dharwar Craton) and also provide an opportunity for wide windows of research to be under taken considering the dykes from SGT.
