Comparison of chemical hydrogeology of the carbonate peninsulas of Florida and Yucatan

Alternative Diagenetic Models for Cretaceous Talus Deposits, Deep Sea Drilling Project Site 536, Gulf of Mexico

“…An example is the northern Yucatan Peninsula today, which, despite having high rainfall and large areal extent, possesses a freshwater lens less than 100 m deep (Back and Hanshaw, 1970). Although the petrography of Unit III is most easily explained by invoking freshwater alteration, the hydrology required by this model is not easily demonstrated.…”

Anisotropy and spatial variation of relative permeability and lithologic character of Tensleep Sandstone reservoirs in the Bighorn and Wind River Basins, Wyoming. Annual report, October 1, 1994-- September 30, 1995

“…The chemical trends seen in Figures 33 are similar to major-ion evolution sequences (Chevotarev, 1955;Freeze and Cherry, 1979) and to dedolomitization, which is dissolution of dolomite and precipitation of calcite caused by the dissolution of anhydrite (Back and Hanshaw, 1970;Hanshaw and Back, 1979;Back et al, 1983;Busby et al, 1990;Plummer et al, 1990). Therefore, we also chose dissolved sulfate as a reaction-progress variable to examine water chemistry.…”

“…Supersaturation with respect to calcite causes precipitation of the mineral, resulting in a decrease of alkalinity and further dissolution of dolomite and anhydrite. This is a typical mechanism of dedolomitization in carbonate rocks (Back and Hanshaw, 1970;Hanshaw and Back, 1979;Back et al, 1983;Busby et al, 1990;Plummer et al, 1990). (Dickey, 1969).…”

Seasonal Responses of Phyloplankton Productivity to Water-Quality Variations in a Coastal Karst Ecosystem of the Yucatan Peninsula

“…The almost complete absence of confining beds above limestone in the Yucatan Peninsula determines a high hydraulic conductivity in the karstic substrate (Back and Hanshaw, 1970). This geohydrological trait leads to high infiltration of the rainfall through subsurface layers, and eventually, full recharging of the aquifer during rainy seasons.…”