Formación de palygorskita asociada al flujo regional de las aguas subterráneas del borde S.O. de la Cuenca del Duero
DOI:
https://doi.org/10.3989/egeol.86424-5760Keywords:
Duero basin, paleogene, groundwater, silica, magnesium, palygosrkite, sandstone, Porosity, diagenesis.Abstract
The present work provides some data concerning the geochemistry of the paleogene groundwater in the S.W. region of the Duero Basin. The data reflect a clear decrease in silica and Mg throughout the regional flow from recharge areas to discharge ones. In one of the Paleogenes Formations of the area –Areniscas de Aldearrubia– the presence of small amounts of palygorskite Was detected. This mineral appears in perfectly automorphic crystals with a tendency to envelope and then close porosity. .
From thermodinamic criteria, the possibility of the conversion of smectite –very abundant in the Formation– into palygorskite by addition of graundwater silica and Mg is in accordance with all the anaIytical and observational data. The palygorskite genesis related lo present or past groundwater flow could be considered as a variant of the diagenetic origin for this mineral.
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