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Authors
Affiliations
1 Institute of Mineralogy and Mineral Resources, Technical University of Clausthal, 38678, Clausthal-Zellerfeld, DE
2 Department of Earth Sciences, University of Bristol, Wills Memorial Building, Queen’s Road, Bristol BS8 1RJ, GB
3 C-52, Gayatri Nagar, Raipur 492-007, Chhattisgarh, IN
4 Department of Mineralogy, The Natural History Museum, Cromwell Road,
South Kensington, London, SW7 5BD, GB
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 69, No Spl Iss 3 (2007), Pagination: 553-556
Abstract
We report in-situ U-Pb dating by laser-ablation quadrupole-based ICP-MS on autometasomatic titanite from the Bhejripadar tuff-facies kimberlite. The lower intercept of the discordia on the Tera-Wasserburg concordia diagram gives 620±30 (2σ) Ma, and the weighted average of 207Pb corrected 206Pb/238U data (n=19) gives 616±24 (2σ) Ma, i.e. within error of the Tera-Wasserburg lower intercept age. This Neoproterozoic age around 620 Ma is likely to represent the age of both the kimberlite volcanism of the Tokapal-Bhejripadar system, and the chemoclastic sedimentation in the lower Indravati Group.
Keywords
Kimberlite, Titanite, LA-ICP-MS, U-Pb dating, Tokapal, Bhejripadar, Chhattisgarh, India.
