Estudio isotópico e hidrológico de la salinización del agua subterránea en la ciudad de La Plata y zonas vecinas. Buenos Aires, Argentina

PANARELLO, HECTOR; DAPEÑA, CRISTINA; AUGE, MIGUEL

Mendoza, Argentina

Congreso; XII Congreso Geológico Argentino y II Congreso de Exploración de Hidrocarburos; 1993

Comisión Congreso Geológico Argentino

This work reports results obtained in the first stages of an isotopic investigation at La Plata and sourrounding zones. The research is being develped within the framework of the ARCAL XII-IAEA, INGEIS contract. Salinization and recharge dynamic were studied by means of stable and radiactive environmental isotopes 2-H, 18-O,3-H y 14-C as well as chemical analyses. Isotopic results evidence more than one origin salinization, acording the chemical type of water involved: 1) brackish waters resulting of the mixture of fresh Puelche or Pampeano groundwaters and variable contribution of the Río de La Plata with sea type waters found in the low plain; 2) mainly sulfated waters that could be recharge in the low plain, which sulfate content cold be explained as resulting of sulfur redox processes; 3) waters salinized only by leaching during their flow. Carbon-14 and tritium nalysis allowed to determine the relative age of several samples and throw some light on the aquifer dynamic in the unsaturated and saturated zones