The Open UniversitySkip to content
 

40Ar - 39Ar Dating of the Kodomali Pipe, Bastar Craton, India: A Pan-African (491±11 Ma) Age of Diamondiferous Kimberlite Emplacement

Chalapathi Rao, N.V.; Burgess, R.; Anand, Mahesh and Mainkar, D. (2007). 40Ar - 39Ar Dating of the Kodomali Pipe, Bastar Craton, India: A Pan-African (491±11 Ma) Age of Diamondiferous Kimberlite Emplacement. Journal of Geological Society of India, 69 pp. 539–545.

Google Scholar: Look up in Google Scholar

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.

Item Type: Journal Article
ISSN: 0016-7622
Extra Information: Kimberlite; Pan-African age; Kodomali; Bastar craton; Central India.
Academic Unit/Department: Science > Environment, Earth and Ecosystems
Interdisciplinary Research Centre: Centre for Earth, Planetary, Space and Astronomical Research (CEPSAR)
Item ID: 9112
Depositing User: Mahesh Anand
Date Deposited: 01 Oct 2007
Last Modified: 02 Dec 2010 20:03
URI: http://oro.open.ac.uk/id/eprint/9112
Share this page:

Actions (login may be required)

View Item
Report issue / request change

Policies | Disclaimer

© The Open University   + 44 (0)870 333 4340   general-enquiries@open.ac.uk