caa a22 4500 445815086 CHVBK 20180317145224.0 cr unu---uuuuu 170323e20110601xx s 000 0 eng 10.1007/s10040-011-0721-6 doi (NATIONALLICENCE)springer-10.1007/s10040-011-0721-6 Major-ion chemistry, δ13C and 87Sr/86Sr as indicators of hydrochemical evolution and sources of salinity in groundwater in the Yuncheng Basin, China [Elektronische Daten] [Matthew Currell, Ian Cartwright] Chimie des ions majeurs, du δ13C et du 87Sr/86Sr en tant qu'indicateurs de d'évolution hydrochimique et de l'origine de la salinité des eaux souterraines du bassin du Yuncheng, Chine Processes controlling hydrogeochemistry in the Yuncheng Basin, China, were characterised using major-ion chemistry, 87Sr/86Sr ratios and δ13C values. Evapotranspiration during recharge increased solute concentrations by factors of ∼5-50 in deep palaeowaters, while higher degrees of evapotranspiration have occurred in shallow, modern groundwater. Aquifer sediments (loess) contain approximately 15 weight% calcite; trends in groundwater HCO3 concentrations and δ13C values (ranging from −16.4 to −8.2‰) indicate that carbonate weathering is a significant source of DIC. Groundwater 87Sr/86Sr ratios (0.7110-0.7162, median of 0.7116) are similar to those in both loess carbonate (0.7109-0.7116) and local rainfall (0.7112), and are significantly lower than Sr in aquifer silicates (0.7184-0.7251). Despite evidence for substantial carbonate dissolution, groundwater is generally Ca-poor (<10% of total cations) and Na-rich, due to cation exchange. Saturation with respect to carbonate minerals occurs during or soon after recharge (all calcite and dolomite saturation indices are positive). Subsequent carbonate dissolution in the deep aquifer must occur as a second-stage process, in response to Ca loss (by ion exchange) and/or via incongruent dissolution of dolomite and impure calcite. The latter is consistent with positive correlations between δ13C values and Mg/Ca and Sr/Ca ratios (r 2 = 0.32 and 0.34). Springer-Verlag, 2011 Hydrochemistry nationallicence Environmental isotopes nationallicence China nationallicence Semi-arid nationallicence Loess nationallicence Currell Matthew School of Geosciences, Monash University, Building 28, Room 124, 3800, Clayton, VIC, Australia aut Cartwright Ian School of Geosciences, Monash University, Building 28, Room 124, 3800, Clayton, VIC, Australia aut Hydrogeology Journal Springer-Verlag 19/4(2011-06-01), 835-850 1431-2174 19:4<835 2011 19 10040 https://doi.org/10.1007/s10040-011-0721-6 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10040-011-0721-6 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Currell Matthew School of Geosciences, Monash University, Building 28, Room 124, 3800, Clayton, VIC, Australia aut NATIONALLICENCE 700 1- Cartwright Ian School of Geosciences, Monash University, Building 28, Room 124, 3800, Clayton, VIC, Australia aut NATIONALLICENCE 773 0- Hydrogeology Journal Springer-Verlag 19/4(2011-06-01), 835-850 1431-2174 19:4<835 2011 19 10040 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer