Observations on the incorporation of trace elements in halite of Oligocene salt beds, Bourg-en-Bresse Basin, France

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It is common practice to employ trace elements found in chloride salts as indicators of the conditions of deposition. Because some halite contains abundant fluid inclusions, it is necessary to separate the salt from the inclusions before analysis. This study presents the data derived from the use of a simple preparative technique which permits analysis of the trace elements in solid halite, and provides a guide to test the success in elimination of the contaminants contained in the fluid inclusions. The differentiation is accomplished simply by crushing the salt in alcohol followed by separate analysis of the fluid and solid components, thus yielding accurate trace element concentrations in the solids (crystal lattice, dislocations, and grain boundaries) and the fluids. Br and K are present both in the solid and liquid phases of the halite, but Mg is exclusively in the fluid inclusions. The elimination of the Mg from the analysis of the solid phase may thus be employed as a monitor to indicate the degree of purification of the samples being analysed.

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