Systematic determination of and adsorption experiment on fluorine in the carbonate rock|soil|water system in the karst region studied in Guizhou Province, in conjunction with the mineral surface and soil chemistry data, have revealed the geochemical characteristics of F and the mechanisms of its transport and enrichment in the rock|soil|water system of the karst region, central Guizhou Province. Deep|seated underground waters (-100m or lower) and soil layers in the karst region of central Guizhou are characterized by high|F anomalies whereas shallow|level underground and surface waters by low contents of F (mostly lower than 0.5 mg/L). Fluorine in soil and water in the region studied comes largely from Triassic marine strata dominated by gypsum|bearing carbonate rocks. The special adsorption and desorption of F on the surface of geothite in soil layers are the important mechanisms of its transport and enrichment in the rock|soil|water system of the karst region studied.
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