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 (2s) Ma, and the weighted average of 207Pb corrected 206Pb/238U data (n=19) gives 616±24 (2s) 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.
|Number of pages||4|
|Journal||Journal of the Geological Society of India|
|Publication status||Published - 2007|