Hydrogeochemistry and sustainability of freshwater lenses in the Samborombón Bay wetland, Argentina

Freshwater lenses constitute one of the most vulnerable aquifer systems in the world, especially in coastal wetland areas. The objectives of this work are to determine the hydrogeochemical processes that regulate the quality of the freshwater lenses in a sector of the Samborombón Bay wetland, and to...

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Autores principales: Carol, Eleonora Silvina, García, Leandro, Borzi, Guido Esteban
Formato: Articulo Preprint
Lenguaje:Inglés
Publicado: 2015
Materias:
Biología
Geología
Freshwater resources
Hydrogeochemistry
Mining
Shell ridge
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/101960
https://ri.conicet.gov.ar/11336/49206
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-101960
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Biología
Geología
Freshwater resources
Hydrogeochemistry
Mining
Shell ridge
spellingShingle Biología
Geología
Freshwater resources
Hydrogeochemistry
Mining
Shell ridge
Carol, Eleonora Silvina
García, Leandro
Borzi, Guido Esteban
Hydrogeochemistry and sustainability of freshwater lenses in the Samborombón Bay wetland, Argentina
topic_facet Biología
Geología
Freshwater resources
Hydrogeochemistry
Mining
Shell ridge
description Freshwater lenses constitute one of the most vulnerable aquifer systems in the world, especially in coastal wetland areas. The objectives of this work are to determine the hydrogeochemical processes that regulate the quality of the freshwater lenses in a sector of the Samborombón Bay wetland, and to assess their sustainability as regards the development of mining activities. A hydrochemical evaluation of groundwater was undertaken on the basis of major ion, trace and environmental isotope data. The deterioration in time of the freshwater lenses in relation to mining was studied on the basis of the analysis of topographic charts, aerial photography and satellite imaging. The results obtained show that the CO<sub>2(g)</sub> that dissolves in the rainwater infiltrating and recharging the lenses is converted to HCO<sub>3</sub><sup>-</sup>, which dissolves the carbonate facies of the sediment. The exchange of Ca<sup>2+</sup> for Na<sup>+</sup>, the incongruent dissolution of basic plagioclase and the reprecipitation of carbonate produce a change of the Ca-HCO<sub>3</sub> facies to Na-HCO<sub>3</sub>. In depth, the pH increases with the groundwater flow, and the volcanic glassis dissolved, releasing F-and As. Besides, the evapotranspiration processes cause the saline content to increase slightly. As the only sources of drinking water in the region are the freshwater lenses occurring in the shell ridges, mining operations have deteriorated this resource and decreased the freshwater reserves in the lenses. The study undertaken made it possible to develop some preservation, remediation and management guidelines aimed at the sustainability of the water resources in the region.
format Articulo
Preprint
author Carol, Eleonora Silvina
García, Leandro
Borzi, Guido Esteban
author_facet Carol, Eleonora Silvina
García, Leandro
Borzi, Guido Esteban
author_sort Carol, Eleonora Silvina
title Hydrogeochemistry and sustainability of freshwater lenses in the Samborombón Bay wetland, Argentina
title_short Hydrogeochemistry and sustainability of freshwater lenses in the Samborombón Bay wetland, Argentina
title_full Hydrogeochemistry and sustainability of freshwater lenses in the Samborombón Bay wetland, Argentina
title_fullStr Hydrogeochemistry and sustainability of freshwater lenses in the Samborombón Bay wetland, Argentina
title_full_unstemmed Hydrogeochemistry and sustainability of freshwater lenses in the Samborombón Bay wetland, Argentina
title_sort hydrogeochemistry and sustainability of freshwater lenses in the samborombón bay wetland, argentina
publishDate 2015
url http://sedici.unlp.edu.ar/handle/10915/101960
https://ri.conicet.gov.ar/11336/49206
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AT garcialeandro hydrogeochemistryandsustainabilityoffreshwaterlensesinthesamborombonbaywetlandargentina
AT borziguidoesteban hydrogeochemistryandsustainabilityoffreshwaterlensesinthesamborombonbaywetlandargentina
bdutipo_str Repositorios
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