Elemental and isotopic pattern of n(Sr)/n(Sr) and δSr/Sr were used to characterise groundwater and recharge of saline ponds in a clastic aquifer in East Austria. Therefore, shallow, artesian and thermal groundwaters of the investigated aquifer along with rainfall and rivers were analysed using (MC) ICP-MS. The n(Sr)/n(Sr) ratio and elemental pattern changed with aquifer depth as a result of progressing bedrock leaching and dissolution with increasing groundwater residence time. The n(Sr)/n(Sr) ratio of shallow groundwater below saline ponds of 0.71019 ± 0.00044 was significantly different from thermal groundwater of 0.71205 ± 0.00035 (U, k = 2). In contrast to previous theories, this result suggested no recharge of saline ponds by upwelling paleo-seawater. Isotope pattern deconvolution revealed that rainfall accounted to about 60% of the n(Sr)/n(Sr) ratio of shallow groundwater below saline ponds. The δSr/Sr values of groundwater decreased from about 0.25 ‰ in most shallow, to predominantly negative values of about -0.24 ‰ in artesian groundwater. This result indicated leaching and dissolution of weathered minerals. In turn, the δSr/Sr of deep thermal groundwater showed positive values of about 0.12 ‰, which suggested removal of Sr from solution by carbonate precipitation. These results highlight the potential of δSr/Sr signature as an additional geochemical tracer.
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