A geochemical and stable isotope investigation of groundwater/surface-water interactions in the Velenje Basin, Slovenia

作者：Kanduc Tjasa^*; Grassa Fausto; McIntosh Jennifer; Stibilj Vekoslava; Ulrich Supovec Marija; Supovec Ivan; Jamnikar Sergej

来源：Hydrogeology Journal, 2014, 22(4): 971-984.

DOI：10.1007/s10040-014-1103-7

• Hydrogeochemistry
• Stable isotopes
• Groundwater/surface-water relations
• Groundwater age
• 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 delta C-13(DIC) indicating degradation of soil organic matter and dissolution of carbonate minerals, similar to surface waters. In addition, groundwater in the Triassic aquifer has delta O-18 and delta D 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 delta C-13(DIC) 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 O-18 and H-2, and have H-3 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.

• 出版日期2014-6