Geochemical studies of the river-estuarine systems of Krishna and Godavari

M.M. Sarin, K.S. Rao, S.K. Bhattacharya, R. Ramesh, B.L.K. Somayajulu


During summer season, the Krishna River waters are enriched in major cations Na, K, Mg, Ca and Si by a factor of 1.2-1.9, in U by a factor of 3 and in delta D by 14.2 ppt compared to those of Godavari. The high delta D of Krishna River waters (+ 1.6 ppt) over those of Godavari (- 12.6 ppt) indicate relatively more evaporation of the former by 15%. The Uranium concentrations of Krishna waters which decreases within approximately 100 km whereas the 234U/ 238U activity ratio is identically suggesting authigenic removal of U does not appear to behave conservatively. The major cations and delta D behave conservatively in both Krishna and Godavari estuaries. Si behaves almost conservatively in the Krishna Estuary whereas in the Godavari Estuary there is about 15% Si removal. The fluxes of all the measured constituents from Krishna and Godavari to the Bay of Bengal during the non-monsoon period are calculated. The clay, silt and sand fractions as well as the Al, Fe, Mn, Cr and Ni concentrations of the clay fractions were determined in Krishna estuarine sediments. The non-monsoonal fluxes from Krishna River to the Bay of Bengal are also estimated


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