Dating problems with selected mining lakes and the adjacent groundwater body in Lusatia, Germany

• Verfasst von: Seebach, Anne Gretje [VerfasserIn]
• Verfasst von: Rohden, Christoph von [VerfasserIn]
• Verfasst von: Ilmberger, Johann [VerfasserIn]
• Verfasst von: Weise, Stephan M. [VerfasserIn]
• Verfasst von: Knöller, Kay [VerfasserIn]
• Titel: Dating problems with selected mining lakes and the adjacent groundwater body in Lusatia, Germany
• Verf.angabe: Anne Seebach, Christoph von Rohden, Johann Ilmberger, Stephan M. Weise, Kay Knöller
• E-Jahr: 2010
• Jahr: 19 Jul 2010
• Umfang: 8 S.
• Fussnoten: Gesehen am 12.07.2023
• Titel Quelle: Enthalten in: Isotopes in environmental and health studies
• Ort Quelle: London [u.a.] : Taylor and Francis, 1995
• Jahr Quelle: 2010
• Band/Heft Quelle: 46(2010), 3, Seite 291-298
• ISSN Quelle: 1477-2639
• DOI: doi:10.1080/10256016.2010.502592
• Datenträger: Online-Ressource
• Sprache: eng
• Sach-SW: deuterium
• Sach-SW: groundwater dating
• Sach-SW: oxygen-18
• Sach-SW: stable isotope tracer techniques
• Sach-SW: sulphurhexafluoride
• Sach-SW: tritium
• K10plus-PPN: 1852467371

Abstract

This study presents selected results, applying environmental tracers to investigate lake water-groundwater interactions at two study sites located in Lusatia, Germany. The focus of the investigations were two meromictic pit lakes and their adjacent aquifers. In order to follow hydrodynamic processes between lake and groundwater, mixing patterns within the lakes as well as ages of lake and groundwater, water samples of ground- and lake water were collected at three occasions, representing summer and winter conditions in the aquatic systems. The water samples were analysed for stable isotopes (deuterium, oxygen-18) and tritium and sulphurhexafluoride (SF6 concentration). Lake water profiles of conductivity and 18O could validate the permanent stratification pattern of both the lakes. Groundwater data sets showed a heterogeneous local distribution in stable isotope values between rain and lake water. A two-component mixing model had been adopted only from 18O data to determine lake water proportions in the surrounding groundwater wells in order to correct measured tritium and SF6 concentrations in groundwater samples. This procedure had been hampered by upstream-located wells indicating strong 18O enrichment in groundwater samples. However, rough groundwater ages were estimated. For both study sites, Piston flow ages between 12.9 and 27.7 years were calculated. The investigations showed the good agreement between two different environmental dating tools, considering the marginal data sets.