The determination of sulphate in fluid inclusions using the M.O.L.E. Raman microprobe. Application to a keuper halite and geochemical consequences

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Sulphate concentrations have been determined in fluid inclusions by Raman spectroscopy using the M.O.L.E. microprobe after verifying that the sulphate determination is proportional to the total sulphate in the aqueous phase. Comparison of m iSO 4 . values in primary fluid inclusions with associated mother brine from actual solar salt works demonstrates their chemical equivalence. Keuper halite of marine origin has also been studied. The inclusions contain solid phases: anhydrite and possibly gypsum and glauberite as well. The moiality of the total dissolved sulphate in the aqueous phase is lower than that obtained during present sea-water evaporation at the halite stage of precipitation. Some geochemical hypotheses are proposed to account for this anomaly.

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