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Authors
Affiliations
1 EPMA Laboratory, Ore Dressing Division, Indian Bureau of Mines, MIDC, Hingna Road, Nagpur - 440 016, IN
2 Department of Earth, Atmospheric & Environmental Sciences, University of Manchester, Manchester, GB
3 Department of Earth sciences, CEPSAR, The Open University, Milton Keynes MK7 6AA, GB
4 C-52, Gayatri Nagar, Raipur - 492 007, Chattisgarh, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 69, No Spl Iss 3 (2007), Pagination: 539-545
Abstract
We report a 40Ar/39Ar whole rock age of 491±11 Ma for the hypabyssal facies, diamondiferous, Kodomali diatreme from the Mainpur kimberlite field (MKF) located 135 km SE of Raipur city, within the Bastar craton, Central India. This age is well supported by the available stratigraphic evidence and also by the recently published Nd isotopic data of the pipe. This study provides the first radiometric evidence for Palaeozoic kimberlite activity of Pan-African age in the Indian shield and recognizes a new and important diamondiferous kimberlite emplacement epoch in this part of the Gondwanaland. Our results also highlight the fact that kimberlite and lamproite emplacement in various Indian cratons occurred over a large time interval and was not essentially contemporaneous during Mesoproterozoic (~1090Ma) as suggested by some earlier workers. If the Pan African age of the Kodomali kimberlite corresponds to a collision with the craton, then the amalgamation of the Indian craton into the Indo-Antarctic supercontinent indeed took place considerably much later than previously assumed.
Keywords
Kimberlite, Pan-African Age, Kodomali, Bastar Craton, Central India.
