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- Title
Aportes al modelo hidrogeológico conceptual de la Cuenca del Río Quequén Grande en su límite suroccidental.
- Authors
Solana, Maria Ximena; Quiroz Londoño, Orlando Mauricio; Weinzettel, Pablo; Donna, Flavia
- Abstract
The Quequén Grande River Basin is one of the most extensive and productive areas of the south-east of Buenos Aires Province. Its birth is located in the mountain range of Tandilia, which constitutes the preferential recharge area of the Pampean aquifer in the region. This shallow, free type aquifer interferes with effluent watercourses. At its southwestern limit, its morphology is strongly asymmetrical and highlights the presence of several wetlands. This phenomenon is associated with the presence of Paleozoic rocks that outcrop occasionally and constitute the hydrogeological basement of the Pampean aquifer. Geochemically, two different groups of wetlands are distinguished in this area related to their chloride content, and the one with a high content in this anion may be related to groundwater upward flows. The aim of this study is to provide new information to the conceptual hydrogeological model for the area through the analysis of surface and ground-water catchment areas. Two preferential directions in the groundwater flow were identified. In the physicochemical analysis of groundwater samples, a bicarbonate sodium-magnesium composition was observed. On the other hand, wetland water samples had a bicarbonate sodium composition, distinguishing a main group with higher chloride content. The correlation between the isotopic deviations of both types of samples suggests the occurrence of recharge of some wetlands from the mountain range of Tandilia.
- Publication
Boletín Geológico y Minero, 2021, Vol 132, Issue 1/2, p197
- ISSN
0366-0176
- Publication type
Article
- DOI
10.21701/bolgeomin.132.1-2.020