COMPARATIVE HYDROGEOCHEMICAL ANALYSIS BETWEEN THE CARBONATE ENVIRONMENTS OF THE STATE OF BAHIA – A STATISTICAL APPROACH

Abstract

This study discusses the hydrogeochemistry among the carbonate environments of the State of Bahia. The study areas are: Fm Salitre; Fm Sete Lagoas / Lagoa do Jacaré; and Fm Olhos d’água / Jacoca. The results suggest that Fm. Olhos D'água/ Jacoca shows a high concentration of physical-chemical elements, hardness, salinity and geochemical signature shows chloride and sodium tendency. The electrical conductivity shows significant correlation with Na⁺ e Cl^-, elements of climatic origin. The Lagoas de Sete Lagoas / Lagoa do Jacaré have registered the lower concentration of parameters, hardness, salinity and geochemical signature shows bicarbonate and calcium tendency. The electrical conductivity shows significant correlation with Na⁺, Cl^-, SO4^-2 e HCO₃^-, suggesting a shared contribution between the elements of climatic and lithological origin. In the Salitre Fm, the geochemical signature shows bicarbonate, calcium and magnesium tendency. The electrical conductivity shows significant correlation with Mg+², suggesting influence of elements of lithological. The three environments differ themselves according to the mean variations of Mg^{+ 2} and HCO₃^-. The Sete Lagoas / Lagoa do Jacaré Fm differ themselves of the others according to mean variation of Ca⁺². These results are related with diferente mineral distributions in lithofacies. The Sete Lagoas / Lagoa do Jacaré Fm differ themselves of Salitre Fm according to mean variation of SO₄^-2, possibly associated with concentration variation of sulfide in the área.