Isotope hydrological evidence of geomorphological changes in northeastern Hungary

An isotope hydrological survey of groundwaters in the northeastern part of Hungary has shown a distribution of stable isotopic composition that cannot be explained by climatic changes alone. Detailed geomorphological studies have pointed out that during the Upper Pleniglacial and Late Glacial, the morphology of the territory, and consequently its catchment area, underwent considerable changes. Data gathered by the authors are consistent with the geomorphological results. The distribution of the isotopic composition data of groundwater provides evidence of both climatic changes and tectonic movements in the area. (author). 8 refs, 7 figs