Condicionantes tectónicos de las variaciones longitudinales del relieve en las Béticas Occidentales. Resultados preliminares
- J.C. Balanyá 1
- F. Moral 1
- L. Barcos 1
- A. Jiménez-Bonilla 1
- I. Expósito 1
- M. Rodríguez-Rodríguez 1
- M. Díaz Azpiroz 1
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1
Universidad Pablo de Olavide
info
ISSN: 1576-5172
Year of publication: 2012
Issue Title: VIII Congreso Geológico de España, Oviedo, 17-19 de julio, 2012.
Issue: 13
Pages: 1571-1574
Type: Article
More publications in: Geotemas (Madrid)
Abstract
The reliefs enclosing the Neogene Ronda Basin (external zones of the Western Betics) show scattered relics of a Late Miocene erosive palaeosurface located at 800-1.000 m a.s.l. We carried out the structural revision of this surface and of the associated coeval shallow-marine sediments Our results indicate that both surface and marine deposits have been uplifted by later growing stages of NE-SW shortening structures and affected by NW-SE trending normal faults. These normal faults represent the recent stages of arc-parallel extension that affected this sector from the Middle Miocene onwards. The effects of this extension can be found also in the southwest end of the Serranía de Ronda reliefs where arc-parallel extension is accommodated by both normal fault systems and strike-slip faults. Calculation of geomorphic indices suggests that these fault systems have been probably active until the Pliocene and later. Our results point to the arc-paralell stretching as the main control at regional scale causing the longitudinal segmentation of the structural and topographic relief in Western Betics.