Abstract
There are many empirical geothermometers that utilize the composition of the elements dissolved in water, yet it is difficult to judge just how reliable they are when applied to low enthalpy thermal systems. The main objective of this paper is to show how a reasonable estimate of the temperature of some typical thermal systems in Sardinia can be obtained from the calculation of the saturation indices of water with some silicates in the local rock matrix. Despite some uncertainties, mainly regarding possible mixing phenomena, the applied methodology appears to give more reliable reservoir temperature values than those given by the empirical geothermometers. The method has been applied to thermal waters circulating in the crystalline basement rocks (granites) and in the sedimentary cover rocks (mainly volcanic effusive products, andesitic lava, ignimbrites, etc.). The temperatures calculated for the hydrothermal systems range between 50 and 110°C.
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