Isotope geochemistry and modelling of the multi-aquifer system in the eastern part of Lithuania | Géochimie isotopique et modélisation du système d’aquifères multiples de Lithuanie orientale Geoquímica isotópica y modelado de un sistema multiacuífero en la parte oriental de Lituania 立陶宛东部多含水层系统的同位素地球化学状况及模拟 Geoquímica isotópica e modelação do sistema aquífero multicamada da zona oriental da Lituânia Геохимия изотопов и моделированиe многослойного водоносного комплекса в восточной части Литвы
2014
Mokrik, Robert | Iodkazis, V. I. (Vitautas Ionovich) | Štuopis, Anicetas | Mažeika, Jonas
A steady-state groundwater flow model of three Quaternary intertill aquifers in the eastern part of Lithuania has been compiled. The distinction of separate modelled layers is based on hydraulic and isotope-hydrochemistry data criteria.³H data were used to estimate the corrected groundwater age and were coupled with a groundwater-flow-dynamics model of the Quaternary aquifer system along a cross-section flow pathway from the Baltic Upland recharge area in eastern Lithuania towards the discharge area in the lowlands near the city of Kaunas in central Lithuania. The bicarbonate content in groundwater (214–462 mg/l) increases downgradient towards the lowland area. The other major constituents and total dissolved solids (TDS) have a trend analogous to the bicarbonate. The¹⁴C activity of dissolved inorganic carbon (DIC) in the groundwater ranges from 41.4 to 85.7 pMC. With aquifer-system depth, active precipitation of aqueous solution takes place by dissolving minerals of calcite and dolomite and leakage of “old” groundwater from lower aquifers; the process is also traced by lower¹⁴C and³H activities and by more positive δ¹⁸O values in lowland areas.
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