Model considerations for the evolution of carbonate groundwaters in the Schwäbische Alb (Federal Republic of Germany) |
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| Authors: | Jochen Michaelis Eberhard Usdowski Günter Menschel |
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| Institution: | 1. Sedimentpetrographisches Institut, Universität Göttingen, 3400 Göttingen, Federal Republic of Germany;2. Biologische Bundesanstalt, 3300 Braunschweig, Federal Republic of Germany |
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| Abstract: | The evolution of carbonate groundwaters may occur in a so-called open or closed system or under conditions between the extremes. In order to distinguish between the cases the chemistry of the water and the carbon isotope composition of the dissolved carbonate, the carbonate rock and the soil CO2 of the recharge area must be known. Model calculations based on measurements of the above parameters show that ground-waters in the “Schwäbische Alb”, Federal Republic of Germany, are evolved essentially under closed-system conditions. The average measured carbon isotope composition of the water is δ 13C = ?13.7%0 vs. calculated values of δ 13C = ?13.5%0 and δ 13C = ?18.5%0 assuming a closed and an open system, respectively. In model calculations for closed-system conditions the origin of sulfate ions has to be considered. |
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