El fondo hidroquímico natural del acuífero de Doñana (So España)
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Ingeniería Cartográfica, Geodesia y FotogrametriaFecha de publicación
2005-09-09Editorial
Diputación Provincial de SoriaCita bibliográfica
MANZANO ARELLANO, María del Sol; CUSTODIO GIMENA, Emilio y COLOMINES, Maite. El fondo hidroquímico natural del acuífero de Doñana (SO ESPAÑA). En: Congreso Ibérico de Geoquímica (5º: 2005: Soria) V Congreso Ibérico de Geoquímica y IX Congreso de Geoquímica de España. Soria: Diputación Provincial, 2005. Pp. 1-13.Palabras clave
DoñanaFondo natural
Control geoquímico
Contaminación
Resumen
[ENG] Groundwater baseline in the Doñana aquifer system (SW Spain) and its geochemical controls has been characterised using major and minor inorganic components and environmental isotopes, with the support of
geochemical modeling. In the unconfined areas groundwater baseline is controlled by: rain water composition, equilibrium with silica, and dissolution of CO2, Na/K feldspars and (locally) CaCO3.
Groundwater baseline changes from the unconfined to the confined sector mostly by: mixing with old marine water, Na/Ca-Mg exchange, sulphate reduction and calcite dissolution/precipitation. In the shallower layers ( 40 m) of the unconfined areas baseline has already been modified by different human activities, as shown
by the presence of agrochemicals and of airborne industry-derived pollutants. This is supported by the calculated tritium ages, which show residence times 40 years for flow lines deeper than 35–40 m.
Groundwater composition in the confined areas is mostly naturally-derived ...
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