Abstract
Recent weathering of Panchpatmali bauxite-bearing terrain, Koraput district, Orissa has been discussed in terms of groundwater geochemistry. pH and Eh are in favour of Fe (OHh development, whereas Na+ : Ca2+ vs. HCO3 : SiO2, HCO3 : SiO2 vs. ppm HCO) and pH -pNa, 2pH -pCa, pK-pH vs. -log [H4 Si04] are all in favour of kaolinite development with a minor amount of gibbsite. These observations have been confirmed by X.R.D., I.R., and S.E.M. of the recent weathered samples of the area. The condition of development of these mineral phases with respect to C02 has also been discussed.
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