Stable isotope studies of cave seepage water

D/H and 18O16O ratios for vadose seepage and precipitation were determined at three cave sites in the eastern U.S.A. Samples were collected over a period of ∼ 1 yr. between the summers of 1978 and 1979. In addition, isotopic determinations were made on a number of individual vadose seepage samples from a variety of caves predominantly located throughout North America. The results of the former portion of the study suggest that the isotopic …