engleski

Geochemical and stable isotope characterization of drip water from Postojna Cave, Slovenia

Comprehensive investigation of geochemical and isotopic characteristics of drip water in Postojna Cave, Slovenia, is presented here. Sampling of drip water was performed at 9 locations within the cave from March 2010 to April 2011. Air and water temperature, pH value, drip rate, conductivity, ion concentrations, 18O of water and 13C of DIC were determined. All drip waters belong to the Ca – HCO3 type according to chemical composition and to the seepage-flow type according to drip rate and its variability. Cave temperature is relatively constant during the year and reflects the average temperature in the region. Relatively constant 18O values of drip water reflect mean 18O of precipitation. A process of prior calcite precipitation (PCP) is proposed for explaining observed differences in some parameters at location 05 – Podrti kapnik in comparison with all other locations.

Stable isotopes; monitoring; PCP; precipitation; geochemical parameters; drip water

nije evidentirano