Stable isotope study of a karstic aquifer in Central Greece. Composition, variations and controlling factors
The present study examines the isotopic composition of a karstic groundwater system in Boeotia (Greece) and the factors that control its variations. For this purpose 42 samples were analyzed for oxygen and hydrogen stable isotopes, and their ratios defined the local groundwater isotope line (LGIL). The results showed a shift of the LGIL in comparison to LMWL, which is expressed by an enrichment of heavier isotopes and lower d-excess values. Apart from the ambient conditions that affect the initial isotopic signature, the secondary processes seem to be a major factor too. These processes are related to the specific geological and hydrogeological setting of the area and include the evaporation of soil water, mixing with paleowaters, hydraulic connection with groundwater systems of different isotope characteristics, and finally water-rock reactions with the karstic aquifer.
KeywordsStable Isotope Meteoric Water Karstic Aquifer Heavy Isotope Hydrogeological Setting
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