Modeling the sulfur and oxygen isotopic composition of sulfates through a halite-potash sequence: Implications for the hydrological evolution of the Upper Eocene Southpyrenean Basin
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文摘
The isotopic composition of sulfates sampled throughout a complete evaporite sequence has contributed to the understanding of the evolution of the Southpyrenean Upper Eocene basin. The δ34S and δ18O values appear to be constant in thick segments of the sequence. This pattern is clearly different from the continuous decrease in δ values predicted by the evaporation processes in a closed system. The observed trend of the δ34S and δ18O values can be successfully modeled by an evaporation process in an open system, where steady state conditions are reached, separated by periods of significant changes in the hydrological regime of the basin. Moreover, in the segments of the sequence where they are constant, the δ34S and δ18O values help to constrain the hydrological parameters of the model.