Abstract
The study area is situated in the southern edge of the Cretaceous Potiguar Basin in Rio Grande do Norte State, in a semiarid region. The groundwater of the Acu aquifer is the main water source of water supplyl for the population and irrigation. Groundwater use has been limited due to the occurrence of saline waters in some sectors of the area. This article tries to show the sources, mechanisms and distribution of groundwater salinization using structural geology, geophysical, hydrogeological and hidrogeochemical techniques. It was found that salinization of the water depends on the structural geology, which controls the direction of flow. Water salinity decreases from south to north in the direction of groundwater flow as transmissivity increases. Water types identified are: Na+ - Cl- ; Ca2+ - Cl- and Mg2+ or Ca2+ — HCO3-. These are related to geochemical processes like evaporation, mineral dissolution and ion exchange
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