Petrografía de los depósitos arenosos generados por el sondeo surgente de Granátula de Calatrava (Ciudad Real): implicaciones genéticas de la surgencia

Abstract

The flowing-well of Granátula de Calatrava (active from 25 July 2000 to 16 January 2001) originated a 36 cm-thick sandy deposit far 50 m from the well-site. The petrographic study of the ejected sandy material permits to yield new data about the genesis of the flowing-well. The sandy record is quartzolithic with sedimentary rock fragments (sandstones with ferruginous and carbonate cements) and metasedimentary rock fragments (meta-quartzarenites and slates). The origin of the sand is related to the Tertiary clastic facies from the Neogene Granátula-Moral de Calatrava Basin. The metasediments were provided from the erosion of Ordovician metasedimentary rocks that constitute the local Hercynian basement. The presence of a higher content of sandstone rock fragments with ferruginous, opaline and carbonate cements at the base of the sandy deposit formed as a result of the well indicates that they formed the upper limit of a confined aquifer. These levels were generated by hot paleo-springs during the Pliocene-Quaternary volcanic activity developed in the Campo de Calatrava (Poblete, 1994).