Publication Date:
2017-04-04
Description:
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.
Description:
Projects Z1-2052 and L1-5451 funded by the Slovenian Research
Agency (ARRS) and the Velenje coalmine D.D.
Description:
Published
Description:
971-984
Description:
5A. Energia e georisorse
Description:
JCR Journal
Description:
restricted
Keywords:
Hydrogeochemistry . Stable isotopes . Groundwater/surface-water relations . Groundwater age . Slovenia
;
03. Hydrosphere::03.02. Hydrology::03.02.02. Hydrological processes: interaction, transport, dynamics
;
03. Hydrosphere::03.02. Hydrology::03.02.03. Groundwater processes
;
03. Hydrosphere::03.02. Hydrology::03.02.04. Measurements and monitoring
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
article
