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Stibilj, V.
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Stibilj, V.
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- PublicationRestrictedHydrogeochemistry of Alpine springs from North Slovenia: Insights from stable isotopes(2012-03-18)
; ; ; ; ; ;Kanduc, T.; Department of Environmental Science, Jožef Stefan Institute, Jamova cesta 39, Ljubljana 1000, Slovenia ;Mori, N.; National Institute of Biology, Department of freshwater and terrestrial ecosystems research, Večna pot 111, 1000 Ljubljana, Slovenia ;Kocman, D.; Department of Environmental Science, Jožef Stefan Institute, Jamova cesta 39, Ljubljana 1000, Slovenia ;Stibilj, V.; Department of Environmental Science, Jožef Stefan Institute, Jamova cesta 39, Ljubljana 1000, Slovenia ;Grassa, F.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Palermo, Palermo, Italia; ; ; ; Springwater chemistry and carbon cycling in our study mainly depend on geological composition of the aquifer. The investigated Alpine springs in Slovenia represent waters strongly influenced by chemicalweathering ofMesozoic limestone and dolomite, only one spring was located in Permo-Carboniferous shales. The carbon isotopic composition of dissolved inorganic carbon (DIC) and suspended organic carbon (POC) as well as major solute concentrations yielded insights into the origin of carbon in Alpine spring waters. The major solute composition was dominated by carbonic acid dissolution of calcite. Waters were generally close to saturation with respect to calcite, and dissolved CO2 was up to fortyfold supersaturated relative to the atmosphere. δ13 C of DIC indicates the portion of soil CO2 contributed in water and is related with soil thickness of infiltrating water in aquifer and could be therefore used as a tool for vulnerability assessment. The δ13 C of DIC ranged from−15.8‰ to −1.5‰ and indicated less and more vulnerable aquifers. Mass balances of carbon for spring waters draining carbonate rocks suggest that carbonate dissolution contributes from approximately 49% to 86% and degradation of organic matter from 13.7% to 51.4%, depending on spring and its relation with rock type, soil environment, and geomorphic position. Stable oxygen isotope composition of water (δ18OH2O), and tritium values range from −12.2 to −9.3‰and from6.4 to 9.8 TU, respectively and indicate recharge frommodern precipitation. According to active decay of tritiumand tritiumin modern precipitation the age of spring waters are estimated to be about 2.6 years for springs located in Julian Alps, about 5 years for springs located in Karavanke and about 5 years for springs located in Kamniško–Savinjske Alps.301 41 - PublicationRestrictedA geochemical and stable isotope investigation of groundwater/surface-water interactions in the Velenje Basin, Slovenia(2014-03-04)
; ; ; ; ; ; ; ;Kanduč, T.; Department of Environmental Sciences, Jožef Stefan Institute, Jamova cesta 39, 1000 Ljubljana, Slovenia ;Grassa, F.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Palermo, Palermo, Italia ;McIntosh, J.; Department of Hydrology and Water Resources, University of Arizona, 1133 E. James E, Rogers Way, Tucson, AZ 85721, USA ;Stibilj, V.; Department of Environmental Sciences, Jožef Stefan Institute, Jamova cesta 39, 1000 Ljubljana, Slovenia ;Ulrich-Supovec, M.; HGEM D.O.O., Zaloška 143, Ljubljana, Slovenia ;Supovec, I.; HGEM D.O.O., Zaloška 143, Ljubljana, Slovenia ;Jamnikar, S.; Velenje Coal Mine, Partizanska 78, 3320 Velenje, Slovenia; ; ; ; ; ; The geochemical and isotopic composition of surface waters and groundwater in the Velenje Basin, Slovenia, was investigated seasonally to determine the relationship between major aquifers and surface waters, water–rock reactions, relative ages of groundwater, and biogeochemical processes. Groundwater in the Triassic aquifer is dominated by HCO3 –, Ca2+, Mg2+ and δ13CDIC indicating degradation of soil organic matter and dissolution of carbonate minerals, similar to surface waters. In addition, groundwater in the Triassic aquifer has δ18O and δD values that plot near surface waters on the local and global meteoric water lines, and detectable tritium, likely reflecting recent (<50 years) recharge. In contrast, groundwater in the Pliocene aquifers is enriched in Mg2+, Na+ , Ca2+, K+, and Si, and has high alkalinity and δ13CDIC values, with low SO4 2– and NO3 – concentrations. These waters have likely been influenced by sulfate reduction and microbial methanogenesis associated with coal seams and dissolution of feldspars and Mg-rich clay minerals. Pliocene aquifer waters are also depleted in 18O and 2H, and have 3H concentrations near the detection limit, suggesting these waters are older, had a different recharge source, and have not mixed extensively with groundwater in the Triassic aquifer.350 98