
handle: 10261/13516
[EN] In order to explain the high rates of salinity in the surface waters of the River Ebro basin in Northern Spain, a catographic synthesis of the gypsiferous lithofacies documented to date has been made at the scale of 1:200,000. In this paper a map (1:2,500,000 scale) showing the distribution of gypsiferous formations within the basin is presented. All the literature reviewed remains accesible through two catalogs of individal filing cards: one contains the original information and the other rearranges it in a standardized way and can be used as a computerized data base. These geological formations are spread over an area of about 1.9 . 10.000.000 hectares (22% of the entire basin), wich fully supports the significant contribution of gypsum dissolution to the primary salinity in streams and rivers.
[ES] Con el fin de explicar los altos niveles de salinidad natural existentes en las aguas superficiales de la Red Hidrográfica del Ebro, se ha realizado una cartografía de síntesis de las litofacies yesíferas en la cuenca a escala 1:200.000. La información bibliográfica manejada queda accesible a través de los catálogos de fichas originales y normalizadas y de un banco de datos informatizado. Se presenta un mapa a escala 1:2.500.000 de la Distribución de las Formaciones con Yesos en la Cuenca del Ebro. La extensión ocupada, 1,9 x 10.000.000 has (22% de la superficie total) corrobora plenamente la significativa contribución de los yesos a la salinidad.
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