Abstract
The Proterozoic Cuddapah basin is a well established U province of India. Both the sediments and the basement granitoids of this basin are characterized by higher abundances of intrinsic U. Remobilization of this intrinsic U had presumably played a role in the formation of the deposits found in this basin. While intrinsic U in the granitoids is controlled mainly by the factors of igneous crystallization, in siliciclastics it is contributed from the detrital and the authigenic (non-detrital) sources. Authigenic U in fine siliciclastics is generally determined by estimating its detrital U with reference to the Th/U ratio of a reference rock. Considering the influence of sedimentological factors like recycling, mixing, hydraulic sorting on Th and the differential chemical stability of U and Th in the near-surface depositional conditions, detrital proxies viz. Al and Ti are taken here for estimating the detrital U.
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