Evidencias de fallamiento y plegamiento activo en el borde norte de la Cuenca del Guadalquivir

1. J.J. Martínez-Díaz ¹
2. C. Canora-Catalán ²
3. J.L. Sánchez-Roldán ¹
4. Juan M. Insua-Arévalo ¹

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More publications in: Geotemas (Madrid)

Abstract

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. Defor- mation 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.

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