Hydrogeology of northern Sierra de Chiapas, Mexico: a conceptual model based on a geochemical characterization of sulfide-rich karst brackish springs

摘要: Conspicuous sulfide-rich karst springs flow from Cretaceous carbonates in northern Sierra de Chiapas, Mexico. This is a geologically complex, tropical area. The physical, geologic, hydrologic and chemical attributes of these were determined integrated into conceptual hydrogeologic model. A meteoric source recharge elevation below 1,500 m are estimated the spring-water isotopic signature regardless their composition. Brackish spring water flows at maximum depth 2,000 m, as inferred similar to produced nearby oil well. Oil reservoirs may be found depths 2,000 m. Three subsurface environments or aquifers identified based on B, Li+, K+ SiO2 concentrations, temperatures, CO2 pressures. There mixing between aquifers. aquifer designated Local shallow contains potable vulnerable pollution. named Northern receives some brackish water. composition Southern influenced by halite dissolution enhanced fault detachment surfaces. Epigenic speleogenesis associated with springs. In contrast, hypogenic sulfidic environments.