A geochemical study carried out using Energy Dispersive Spectrometry (EDS) on six samples of carnallitite salts from well 3 of the Kanga permit, northwest of Pointe-Noire, confirmed the carnallitic nature of these salts. Indeed, the strong correlations between magnesium (Mg2+) and chlorine (Cl-), as well as between magnesium (Mg2+) and potassium (K+), preferentially promoted the precipitation of carnallite at the expense of bischofite. This result is related to brine homogenization and climatic aridity, which favored intense evaporation. The weak correlation observed between potassium (K+) and chlorine (Cl-) explains the absence of sylvite, as the latter acted as a catalyst in the formation of carnallite. The strong correlation between calcium (Ca2+) and sulfur (S2+) favored the formation of anhydrite beds intercalated within finely stratified halite layers of the confined phase. The strong correlation between iron (Fe3+) and silicon (Si4+), in the presence of aluminum (Al3+), led to the formation of ferriferous smectite (berthierine). The significant presence of Cl- and Na+ indicates a marine source, while Fe2+, Al3+, Si4+, Ca2+, Mg2+, K+, S2+, Ni2+, Mo2+, Mn2+, and P5+ indicate a fluvial source from rivers draining schist-limestone formations.