Effect of structural discontinuity on the hydrogeochemistry of the Barreiras aquifer in northeastern Brazil
The Barreiras aquifer in the Boa Cica wells field, located in the Nísia Floresta Country/RN, is composed of siliciclastic rocks with a median thickness of 65 meters. The studied area it is over a Mesozoic carbonate aquitard. Both units, locally, are intercepted by fault system with NE-SW and NW-SE d...
| Autores: | , , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2019 |
| País: | Brasil |
| Institución: | Associação Brasileira de Águas Subterrâneas |
| Repositorio: | Águas Subterrâneas (São Paulo. Online) |
| Idioma: | portugués |
| OAI Identifier: | oai:ojs.aguassubterraneas.abas.org:article/29225 |
| Acceso en línea: | https://aguassubterraneas.abas.org/asubterraneas/article/view/29225 |
| Access Level: | acceso abierto |
| Palabra clave: | Barreiras aquifer. Structural discontinuity. Groundwater geochemistry. Water group. Aquífero Barreiras. Descontinuidade estrutural. Hidrogeoquímica. Grupo de águas. |
| Sumario: | The Barreiras aquifer in the Boa Cica wells field, located in the Nísia Floresta Country/RN, is composed of siliciclastic rocks with a median thickness of 65 meters. The studied area it is over a Mesozoic carbonate aquitard. Both units, locally, are intercepted by fault system with NE-SW and NW-SE ditections. The objective of this study is to understand the interaction between the geological structuring of the area and the hydrogeological and hydrogeochemical variables. The faults yield discontinuities that causes a preferential flow path of groundwater interaction within the aquitard-aquifer, taking place in the depths by ascending vertical flow, This conclusion seems to be consistent with the fact that two distinct groups of groundwater have been observed: Group 1, of sodium-chloride type facies, typical of the Barreiras; Group 2, of calcium magnesium-bicarbonate type facies, typical of the carbonate aquitard. |
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