Abstract
The kinetics of aluminosilicate water reactions has been studied mainly theoretically and extrapolated at very long time starting from experimental studies performed far from equilibrium. Some sets of waters such as those from Nagra boreholes, Northern Switzerland, allow to define some constraints on the times needed to reach equilibrium. Waters obtained by Nagra in six boreholes in crystalline areas of the North Switzerland and waters of the granitic recharge area (Black Forest) were analyzed for both chemical and isotopic characteristics (Pearson et al., 1991). When considered for several aspects, waters fall into four groups. These aspects are geographic location, water salinity, gases concentrations and isotopic properties: 1) the recharge group: these waters have undergone minimal waterrock interaction and have been very recently recharged. 2) the Eastern group present salinities, helium
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