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Quantitative Environmental Analysis of Ste. Genevieve Limestone (Mississippian), Southern Illinois and Eastern Missouri

Discriminant analysis of Ste. Genevieve Limestone samples suggests that carbonate depositional environments may be conceptualized as shifting over an energy surface in response to changing energy conditions. Evolution of carbonate deposition through time, based on elasticity, seems to have followed at least five paths from smallest to greatest energy. Variation of mean values of elasticity and frequency of all measured organic and inorganic parameters define these paths and reflect energy changes which were not recognized initially in the microfacies except for the generation and distribution of oolites. In an earlier petrographic study, the Ste. Genevieve Limestone was found to be characterized by eight major microfacies. The data which defined these microfacies are now classified into 21 energy groups based on depositional textures, microfacies relations, and discriminant analysis. Discriminant analysis shows that elasticity measurements are better predictors of facies and energy criteria than are the combined parameters of elasticity and frequency which intuitively would be expected to be better. Frequency and elasticity values for the rock samples reflect fluctuations in composition through time and space within the limits of five major energy groups. Combined with microfacies categories and discriminant analysis they also define subgroupings within individual major energy groups and therefore more accurately record depositional environments than formerly has been possible. Percentages of sample abundances in the various recognized groups and subgroups are interpreted here as representing the optimum environmental energy paths during the evolution of Ste. Genevieve Limestone deposition.