Resumen de Evidencias petrográficas y geoquímicas sobre la procedencia de las areniscas de la Formación Sariñena (sector septentrional de la Cuenca del Ebro, España)
Aránzazu Luzón Aguado, Alfonso Yuste Oliete, Blanca Bauluz Lázaro
The aim of this study has been to determine the possible influence of several source areas the sedimentation which took place on the septentrional limit of the Ebro Basin (Central sector) during the Oligocene-Miocene. Such sediments correspond to the Sariñena Formation and were deposited in relation to alluvial systems coming from the north. In this study mineral and geochemical techniques have been combined with sedimentological data in order to get the aim. Studied sandstones (25) come from proximal alluvial fans located at the S of Sierras Surpirenaicas; from alluvial-fluvial fans (fluvial systems of Huesca); and from Sierra de Sis, located at the S of the Axial Zone. The mineralogical and geochemical data show that the alluvial sandstones would come mainly from carbonate areas (Sierras Surpirenaicas) and those and alluvial-fluvial from more heterogeneous areas and mainly with silica composition (Axial Zone). On the other hand, the compositional differences between the alluvial-fluvial sandstones and those collected from Sierra de Sis imply that, despite the latter acted as a channel for the alluvial-fluvial fans, its mineralogical or geochemical signature has not been reflected in the alluvial-fluvial sandstones. This may be due to the sedimentary process and to the addition of other sediments to the system during its crossing by the zone of the Graus-Trem Basin.
