Publication: Evidencias de fallamiento y plegamiento activo en el
borde norte de la Cuenca del Guadalquivir
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Publication Date
2021
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Sociedad Geológica de España.
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Abstract
Se presenta una serie de evidencias estructurales y geomorfológicas que apoyan la existencia de estructuras compresivas con actividad post-Tortoniense y que afectan a la red fluvial cuaternaria a lo largo del borde NO de la cuenca del Guadalquivir, en el sector de Palma del Río (Córdoba). Se trata de una serie de suaves anticlinales asimétricos de orientación entre ESE-ONO y ENE-OSO y vergencia norte, marcadas en el paisaje por la morfología controlada por las calcarenitas del Tortoniense Superior, posiblemente asociadas a la actividad de fallas inversas de orientación Bética ENE-OSO, y a la reactivación neotectónica de estructuras antiguas de orientación varisca. Se ha estimado una tasa preliminar de levantamiento tectónico de algunas de ellas y se describen afecciones a la red fluvial cuaternaria que apoyan la vigencia de su actividad, lo que contribuye
al entendimiento del régimen tectónico actual y aporta datos de interés para los estudios de riesgo sísmico en la zona.
We present structural and geomorphological evidence supporting the existence of post-Tortonian compressional structures that are also affecting the present fluvial network along the NW edge of the Guadalquivir basin in the Palma del Río sector. They are a series of gentle asymmetric anticlines verging north, oriented ESE-ONO to ENE-OSO and marked in the landscape by the morphology controlled by the Late Tortonian calcarenites. They are possibly associated with fault propagation folds related to reverse faults of Betic orientation and by the neotectonic reactivation of older structures with Variscan ONO-ESE orientation. A preliminary rate of tectonic uplift for some of these structures has been estimated. Deformation and deflections affecting the present fluvial network support a very recent age for this activity. These data contribute to the understanding of the current tectonic regime and provides valuable data for seismic risk assessments in the region.
We present structural and geomorphological evidence supporting the existence of post-Tortonian compressional structures that are also affecting the present fluvial network along the NW edge of the Guadalquivir basin in the Palma del Río sector. They are a series of gentle asymmetric anticlines verging north, oriented ESE-ONO to ENE-OSO and marked in the landscape by the morphology controlled by the Late Tortonian calcarenites. They are possibly associated with fault propagation folds related to reverse faults of Betic orientation and by the neotectonic reactivation of older structures with Variscan ONO-ESE orientation. A preliminary rate of tectonic uplift for some of these structures has been estimated. Deformation and deflections affecting the present fluvial network support a very recent age for this activity. These data contribute to the understanding of the current tectonic regime and provides valuable data for seismic risk assessments in the region.