| Abstract [eng] |
The Baltic Artesian Basin (BAB) is a sedimentary basin located in the northern Europe, underlaid by a crystalline rock basement. Groundwater is divided into three main zones active, delayed exchange, and stagnant. A chemical classification of the basin‘s groundwater involves various parameters: salinity, hydrochemical facies, depth, and major ion ratios. This research aimed to investigate the origin of groundwater‘s isotope-geochemistry anomalies and their formation scenarios. The cases studied involve intermediate groundwater upward flow injection on local anomalous sites (the Southern Lithuania), anomalies of the Devonian aquifers (the central BAB), the basin-scale anomaly of the Estonian Homocline (Cm-V and O-Cm aquifer systems), and interaction of deep-intermediate depth regional flow systems. The study also involves helium content distribution description and the novel comparison of conventional 4He, 81Kr dating results with numeric modeling of flow particle travel times in intermediate and deep groundwater. |
