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[en] The authors report the analysis of the oxygen isotopic composition of sulfates dissolved in 102 samples of thermal waters coming from different contexts: sedimentary (Parisian Basin), volcanic (New Mexico, West Indies, Mont Dore in France), or base (France), with the objective of a better understanding of the behaviour of oxygen isotopes of dissolved sulfates in order to use them as a geochemical tool in geothermal exploration. Some of these thermal waters contain colloids of silica, sulphur or iron which disturb oxygen extraction, and the authors therefore reconsidered handling conditions. After a recall of knowledge about the sulfate-water geo-thermometer (thermodynamic balance, kinetic parameters), the authors address mechanisms which disturb the SO4-H2O thermometer (cases of overestimated or underestimated temperature). They describe the experimental methodology: sampling, chemical processing, oxygen extraction, isotopic analysis by using a mass spectrometer. Then applications to the different studied fields are reported.