WATER GEOCHEMISTRY, ENVIRONMENTAL ISOTOPES AND RADON IN THE FLOW PATTERNS OF THE GROUNDWATER IN AGUASCALIENTES, MEXICO

Chemical concentrations of major and minor ionic species, oxygen-18, Deuterium and Radon-222 from groundwater samples have been measured in order to understand the role of flow patterns in the study area. Parameters distribution shows three main facies: 1. Sodic bicarbonated water, the registered temperatures in this group, fluctuates between 37 and 40 degrees. 2. Mix group, resulted of the principal water facies, its temperature varies between 25 and 40 degrees and presents the greater observed lithium concentrations. 3. Calcic bicarbonated water, its temperatures vary between 23 and 29 degrees. The composition of waters in Aguascalientes is influenced by factors like: mixing water, possible flow of magmatic origin, high heat-flux conditions, and fluid-rock interaction. Radon-222 shows that the heat contribution of radioactive origin is attributing to the rhyolitic and plutonic acid rocks, of the subsoil of Aguascalientes. Environmental isotopes represent a mixture of rain water from different altitudes.