6533b7d5fe1ef96bd12649c9
RESEARCH PRODUCT
Pleistocene age paleo-groundwater inferred from water-stable isotope values in the central part of the Baltic Artesian Basin.
Tõnu MartmaAlise BabreKonrāds PopovsInga RetiķeAndis KalvansRein VaikmäeAija Dēliņasubject
Hydrology010506 paleontologyVienna Standard Mean Ocean WaterHydrogeologyPleistoceneδ18OStable isotope ratioGeochemistryArtesian basinOxygen Isotopes010502 geochemistry & geophysicsDeuterium01 natural sciencesInorganic ChemistrySalinityEnvironmental ChemistryGroundwaterGeologyGroundwater0105 earth and related environmental sciencesGeneral Environmental Sciencedescription
A new data set of δ(2)H and δ(18)O in the groundwater from the central part of the Baltic Artesian Basin is presented. The hydrogeological section is subdivided into stagnation, slow exchange and active exchange zones. Na-Ca-Cl brine found at the deepest part - the stagnation zone - is characterized by δ(18)O values above -5 ‰ and δ(2)H values approaching -40 ‰ with respect to Vienna Standard Mean Ocean Water. The slow exchange zone where waters of mostly intermediate salinity reside is characterized by δ(18)O values around -11.7 ‰ and δ(2)H values around -85.3 ‰. Mean δ(18)O and δ(2)H values of the fresh groundwater in the active water exchange zone are -11.1 and -79.9 ‰, respectively. Characteristically, the groundwater in the active and slow exchange zone is isotopically more depleted compared with the precipitation values observed, and the depletion increases with depth down to the level where strongly enriched brines are encountered.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2016-05-04 | Isotopes in environmental and health studies |