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Pb-Pb Age of Carbonates of Jhamarkotra Formation: Constraints on the Age of Aravalli Supergroup, Rajasthan
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Pb-Pb isochron age of carbonate rocks of the Jhamarkotra Formation of the Aravalli Supergroup from the Udaipur sector in Rajasthan has been measured for the first time as 1921±67 Ma (2σ). We consider this as a reset age, as it is indistinguishable from the earlier reported Rb-Sr isochron age of 1900±8O Ma for the Darwal Granite formed synkinematically with the Aravalli deformation. The depositional age of the Jhamarkotra carbonates could be 200-300 Ma older as suggested by the positive δ13C anomalies noted in these carbonate rocks.
Keywords
Pb-Pb Isochron Age, Carbonates, Aravalli Supergroup Rajasthan.
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