The origin of groundwater composition in the Pampeano Aquifer underlying the Del Azul Creek basin, Argentina

The Science of the Total Environment
M E ZabalaL Vives

Abstract

The Pampean plain is the most productive region in Argentina. The Pampeano Aquifer beneath the Pampean plain is used mostly for drinking water. The study area is the sector of the Pampeano Aquifer underlying the Del Azul Creek basin, in Buenos Aires province. The main objective is to characterize the chemical and isotopic compositions of groundwater and their origin on a regional scale. The methodology used involved the identification and characterization of potential sources of solutes, the study of rain water and groundwater chemical and isotopic characteristics to deduce processes, the development of a hydrogeochemical conceptual model, and its validation by hydrogeochemical modelling with PHREEQC. Groundwater samples come mostly from a two-depth monitoring network of the "Dr. Eduardo J. Usunoff" Large Plains Hydrology Institute (IHLLA). Groundwater salinity increases from SW to NE, where groundwater is saline. In the upper basin groundwater is of the HCO3-Ca type, in the middle basin it is HCO3-Na, and in the lower basin it is ClSO4-NaCa and Cl-Na. The main processes incorporating solutes to groundwater during recharge in the upper basin are rain water evaporation, dissolution of CO2, calcite, dolomite, silica, and anorthit...Continue Reading

Associated Datasets

Jul 7, 2020·Ricardo Sánchez MurilloMartín Gorocito

References

Jun 19, 2003·The Science of the Total Environment·W M EdmundsR S Ward
Dec 6, 2005·Ground Water·Jeffrey D WilcoxJean M Bahr

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Citations

Oct 27, 2020·Data in Brief·María Emilia ZabalaMarcelo Varni
Dec 2, 2020·The Science of the Total Environment·M E ZabalaE Ceballos

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