Unravelling groundwater and surface water sources in the Esteros del Iberá Wetland Area: An isotopic approach
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The data from various projects between 2011 and 2015: International Atomic Energy Agency, project "The role of wetlands and rivers in the discharge of groundwater from the Guaraní aquifer in NE Argentina"; Ministry of Economy and Competitiveness of Spain, MICINN-REDESAC project CGL2009-2910-CO3, "Aquifer recharge and discharge processes"; and Ministry of Science, Technology and Productive Innovation of Argentina (PICT project 2008/2071). The authors would like to thank the comments and corrections of two anonymous reviewers that contributed greatly to improve the manuscript.Fecha de publicación
2022-07-14Editorial
ElsevierCita bibliográfica
Ortega, L.; Miller, J.; Araguás-Araguás, L.; Zabala, M.E.; Vives, L.; Mira, A.; Rodríguez, L.; Heredia. J., Armengol, S., Manzano, M. 2022. Unravelling groundwater and surface water sources in the Esteros del Iberá Wetland Area: An isotopic approach. Science of the Total Environment 846 (2022) 157475. http://dx.doi.org/10.1016/j.scitotenv.2022.157475Revisión por pares
siPalabras clave
Guaraní Aquifer SystemIberá wetlands
water sources
222-Rn
δ18O and δ2H
EMMA
Localización
Resumen
In the Esteros del Iberá Wetland Area (EIWA, NE Argentina), the southern sector of the transboundary Guarani Aquifer System (SAG) is overlain by the Ramsar listed Iberá Wetlands and several rivers, that combined extend across 37,930 km2 and represent one of the largest freshwater systems on the South American continent. Previous hydrogeological studies encompassing the entire SAG proposed preferential discharge of groundwater of various origins and ages to the EIWA. In this study, a multi-tracer study using major ionic species, δ18O, δ2Hand222Rn was conducted in lagoons, rivers, wells, and boreholes in the EIWA to confirm if discharge from the transboundary SAG is contributing to the sur-face water system. End-member Mixing Analysis (EMMA) determined the existence of four main end-members: groundwater from the SAG, more saline groundwater from the deeper Pre-SAG, and two poorly mineralised end-members from shallow, Post-SAG. EMMA calculations clearly illustrated complex binary and ternary ...
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