Investigation des interactions entre les eaux de surface et les eaux souterraines dans le bassin de Velenje, Slovénie, par la géochimie et les isotopes stables de l'eau

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

Tjaša Kanduč, Fausto Grassa, Jennifer McIntosh, Vekoslava Stibilj, Marija Ulrich-Supovec, Ivan Supovec, Sergej Jamnikar

Research output: Contribution to journalArticle

25 Scopus citations

Abstract

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.

Translated title of the contributionA geochemical and stable isotope investigation of groundwater/surface-water interactions in the Velenje Basin, Slovenia
Original languageFrench
Pages (from-to)971-984
Number of pages14
JournalHydrogeology Journal
Volume22
Issue number4
DOIs
StatePublished - Jun 2014

Keywords

  • Groundwater age
  • Groundwater/surface-water relations
  • Hydrogeochemistry
  • Slovenia
  • Stable isotopes

ASJC Scopus subject areas

  • Water Science and Technology
  • Earth and Planetary Sciences (miscellaneous)

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