Abstract
The combined application of Raman microspectroscopy and the cooling stage to the study of fluid inclusions opens the possibility determining the molar volumes (v) of fluid mixtures in rocks. Isochoric XT-diagrams are introduced and it is demonstrated that the equations of state presently available (for example the Heyen equation for CO2-N2 mixtures) are not valid outside the range of experimental data used for their calibration. Measurements on CO2-N2 inclusions of extremely low molar volume (about 40 cm3/mole) from the Furua Granulite Complex (Tanzania) are used as an example. Studies on fluid inclusions may therefore contribute, in a semi-quantitative way, to the improvement of equations of state for multi-component systems.
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