Variaciones geomorfológicas como condicionantes de la química del agua subterránea en el litoral del estuario medio del Río de la Plata

Marisol Melo; Eleonora Carol

doi:10.24215/25456377e120

Authors

Marisol Melo Facultad de Ciencias Naturales y Museo, Universidad Nacional de La Plata CONICET
Eleonora Carol Facultad de Ciencias Naturales y Museo, Universidad Nacional de La Plata CONICET

DOI:

https://doi.org/10.24215/25456377e120

Keywords:

Hydrogeochemistry, Isotopic and ionic relationships, Coastal environments,

Abstract

The goal of this work was to determine changes in groundwater chemistry and associated geochemical processes as a function of geomorphological variations in the Río de la Plata coastal plain, within the littoral sector of the middle estuary. With this purpose, a monitoring network of groundwater and surface water was established for determining major ions, nitrate, and stable water isotopes. Isotopic analyses indicate that rainwater infiltrates with no previous evaporation, recharging shallow groundwater, and that surface water exhibits less than 10% of evaporation. These low percentages of evaporation might be related to the fact that the sampling was carried out in a month of water surplus. The chemical composition of major ions records variations as a function of geomorphology. The ancient intertidal plain and the plain with shell ridges exhibit facies that vary between sodium bicarbonate and sodium chloride according to depth of sampling. These variations would be controlled by the composition of meteoric water and the chemical reactions resulting from its interaction with the sediment. The chemical composition of the marsh groundwater is controlled by tidal flows from the Río de la Plata.

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