Abstract
The reservoir temperatures of 22 hot spring waters from 9 localities in the Upper Rhine graben and the northern Black Forest have been determined using 4 different geothermometers (SiO 2, Na-K, Na-K-Ca and 18O-sulphate). The 18O-sulphate thermometer and the SiO 2 thermometer yield concordant temperatures in those thermal waters which have not been diluted by near-surface ground water components. Deviations of the SiO 2 thermometer from the 18O-sulphate thermometer can be applied to estimate the near-surface water components in hot spring waters. The alkali content of these waters can not be used for geothermometry. The highest reservoir temperatures have been calculated for the hot springs of Baden-Baden (156°C). All other hot springs have substantially lower reservoir temperatures (115 to 65°C). The ∂ 18O and ∂ D values of the hot water component are comparable with the mean of the ∂ 18O and ∂ D values of modern meteoric waters from higher elevations of the Black Forest; the cold components have stable isotope ratios of local precipitation.
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