Mathematics – Logic
Scientific paper
Dec 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996gecoa..60.5075k&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 60, Issue 24, pp.5075-5087
Mathematics
Logic
11
Scientific paper
The hydrochemical interaction between groundwater and lakewater influences the composition of water that percolates downward from the surficial aquifer system through the underlying intermediate confining unit and recharges the Upper Floridan aquifer along highlands in Florida. The 87 Sr/ 86 Sr ratio along with the stable isotopes, D, 18 O, and 13 C were used as tracers to study the interaction between groundwater, lakewater, and aquifer minerals near Lake Barco, a seepage lake in the mantled karst terrane of northern Florida. Upgradient from the lake, the 87 Sr/ 86 Sr ratio of groundwater decreases with depth (mean values of 0.71004, 0.70890, and 0.70852 for water from the surficial aquifer system, intermediate confining unit, and Upper Floridan aquifer, respectively), resulting from the interaction of dilute oxygenated recharge water with aquifer minerals that are less radiogenic with depth. The concentrations of Sr 2+ generally increase with depth, and higher concentrations of Sr 2+ in water from the Upper Floridan aquifer (20-35 g/L), relative to water from the surficial aquifer system and the intermediate confining unit, result from the dissolution of Sr-bearing calcite and dolomite in the Eocene limestone. Dissolution of calcite [ 13 C = -1.6 permil (% o )] is also indicated by an enriched 13 C DIC (-8.8 to -11.4% o) in water from the Upper Floridan aquifer, relative to the overlying hydrogeologic units ( 13 C DIC < -16% o ). Groundwater downgradient from Lake Barco was enriched in 18 O and D relative to groundwater upgradient from the lake, indicating mixing of lakewater leakage and groundwater. Downgradient from the lake, the 87 Sr/ 86 Sr ratio of groundwater and aquifer material become less radiogenic and the Sr 2+ concentrations generally increase with depth. However, Sr 2+ concentrations are substantially less than in upgradient groundwaters at similar depths. The lower Sr 2+ concentrations result from the influence of anoxic lakewater leakage on the mobility of Sr 2+ from clays. Based on results from mass-balance modeling, it is probable that cation exchange plays the dominant role in controlling the 87 Sr/ 86 Sr ratio of groundwater, both upgradient and downgradient from Lake Barco. Even though groundwater from the three distinct hydrogeologic units displays considerable variability in Sr concentration and isotopic composition, the dominant processes associated with the mixing of lakewater leakage with groundwater, as well as the effects of mineral-water interaction, can be ascertained by integrating the use of stable and radiogenic isotopic measurements of groundwater, lakewater, and aquifer minerals.
Bullen Thomas D.
Katz Brian G.
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