Petrographic, stable and radiogenic isotope, trace-element, and fluid-inclusion data from the Devonian Nisku reef trend in the subsurface of Alberta, Canada, suggest that saddle dolomite was a by-product of chemical compaction and thermochemical sulfate reduction in subsiding dolomitized rocks. Furthermore, thermochemical sulfate reduction may be representative of other processes that increase the amount of saddle dolomite via an increase in carbonate alkalinity. The data also confirm that saddle dolomite is most likely to form at elevated temperatures from hypersaline brines.

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