New Proterozoic KAr ages for some kimberlites and lamproites from the Cuddapah Basin and Dharwar Craton, South India: evidence for non-contemporaneous emplacement
作者: N.V. Chalapathi RaoJohn A. MillerDavid M. PyleV. Madhavan
作者单位: 1Department of Earth Sciences, Downing Street, Cambridge CB2 3EQ, UK
2Bullard Laboratories, Department of Earth Sciences, Madingley Road, Cambridge CB3 OEZ, UK
3Department of Geology, Kakatiya University, Warangal 506009, A.P., India
刊名: Precambrian Research, 1996, Vol.79 (3), pp.363-369
来源数据库: Elsevier Journal
DOI: 10.1016/0301-9268(95)00105-0
原始语种摘要: Abstract(#br)We report new KAr age determinations carried out on mica separates from kimberlites and lamproites that occur within and adjacent to the intra-cratonic Cuddapah basin in southern India. This work includes the first ages obtained from the Ramannapeta lamproite (at the northeastern margin of the Cuddapah basin) and from one of the kimberlites in the Mahbubnagar district. The Ramannapeta lamproite and the Kotakonda kimberlite were both emplaced in the Proterozoic and have ages of 1384 ± 18 and 1363 ± 48 Ma, respectively. These dates are similar to the 1350 ± 52 Ma age obtained here for the Chelima lamproite (within the Cuddapah basin). The Muligiripalle kimberlite (Pipe 5 of the Anantapur district) on the other hand yielded a much lower age of 1153 ± 17 Ma. Our results...
全文获取路径: Elsevier  (合作)
影响因子:4.441 (2012)