The theoretical significance of the filling temperature of fluid inclusions containing significant amounts of both water and CO 2 is discussed in terms of H 2 O-CO 2 mutual solubility. It is shown that the filling temperature can be lower, higher, or equal to the temperature of formation. The method of geothermometry, suggested by Smith in 1953, which is based on the recognition of the cases where the filling temperature is equal to the temperature of formation, is discussed in detail. Six examples are given of its tentative application to minerals from Sn deposits, for which temperatures of formation in the 300-400 degrees C. range were obtained.

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