Publication: Evolución geoquímica de la salmuera de la laguna
de Alcahazo, Pedro Muñoz (Ciudad Real).
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1992
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Instituto Geológico y Minero de España (Madrid)
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Abstract
La Mancha, por sus condiciones climáticas y geomorfológicas, es una región natural en la que se forman frecuentes encharcamientos que derivan hacia sistemas tipo "sebkha" en los que se produce precipitación de sales por evaporación. En la laguna se han determinado las siguientes fases minerales: sulfato magnésico (epsomita, hexahidrita, pentahidrita y kieserita), sulfato cálcico (yeso), cloruro sódico (halita) y cloruro magnésico (bischofita). Las aguas de la laguna, en el período de máxima dilución, presentan una composición marcadamente sulfatada, con alto contenido en cloruros, magnesio y sodio. En laboratorio se ha realizado el seguimiento de la evolución de la salmuera en condiciones equivalentes a las naturales, estableciéndose su correlación con la secuencia teórica de precipitación según VALYASHKO. Por último, se hace una valoración más detallada de los contenidos en estroncio, lo que permite establecer la hipótesis, en función de los aportes, de que esta laguna funciona como un sistema cerrado con recargas limitadas a aportes de lluvia en su cuenca de recepción.
La Mancha, according to their climatic and geomorphological characteristics, is a natural region with a frequent swampings which change into sebkha environments. In these sebkhas is very common the seasonal precipitation of evaporites. In the pond studied, we have determined the precipitation of the next evaporite minerals: magnesium sulphate (epsomite, hexahidrite, pentahidrite and kieserite), calcium sulphate (gypsum), sodium chloride (halite) and magnesium chloride (bischofite). The waters of the pond, in the maximun dilution moment, present a typical sulphate composition with a high contents of chlorides, magnesium and sodium. In the laboratory, we have tried to simulate the natural precipitation of the evaporites from original water of the pond. The results of this experiment are correlated with the theorical precipitation sequence of VAL VASHKO. Finally, a more detailed study of strontium contents is carried out, establishing the conclusion that the water input of the pond is, probably, exclusively related to rain water.
La Mancha, according to their climatic and geomorphological characteristics, is a natural region with a frequent swampings which change into sebkha environments. In these sebkhas is very common the seasonal precipitation of evaporites. In the pond studied, we have determined the precipitation of the next evaporite minerals: magnesium sulphate (epsomite, hexahidrite, pentahidrite and kieserite), calcium sulphate (gypsum), sodium chloride (halite) and magnesium chloride (bischofite). The waters of the pond, in the maximun dilution moment, present a typical sulphate composition with a high contents of chlorides, magnesium and sodium. In the laboratory, we have tried to simulate the natural precipitation of the evaporites from original water of the pond. The results of this experiment are correlated with the theorical precipitation sequence of VAL VASHKO. Finally, a more detailed study of strontium contents is carried out, establishing the conclusion that the water input of the pond is, probably, exclusively related to rain water.