Control del nivel de base fluvial en el rejuvenecimiento diferencial del sistema kárstico en yesos de Olvera-Zaframagón (NE Prov. Cádiz)

  1. Martínez Sánchez, Antonio
  2. Castillo López, Olegario
  3. Gracia Prieto, F Javier 1
  1. 1 Universidad de Cádiz
    info

    Universidad de Cádiz

    Cádiz, España

    ROR https://ror.org/04mxxkb11

Revue:
Cuaternario y geomorfología: Revista de la Sociedad Española de Geomorfología y Asociación Española para el Estudio del Cuaternario

ISSN: 0214-1744

Année de publication: 2019

Volumen: 33

Número: 3-4

Pages: 53-78

Type: Article

DOI: 10.17735/CYG.V33I3-4.70826 DIALNET GOOGLE SCHOLAR lock_openAccès ouvert editor

D'autres publications dans: Cuaternario y geomorfología: Revista de la Sociedad Española de Geomorfología y Asociación Española para el Estudio del Cuaternario

Résumé

The present work deals with the relief evolution in an area of the northwestern sector of the Betic Ranges. It is characterized by extensive outcrops of Triassic clays and gypsums over which several isolated reliefs of Jurassic carbonate rocks stand out, like the Zaframagón Rock, West of Olvera village. The flattened summits of all these carbonate blocks delimit an old erosion surface sloping NW, very probably related to the progressive continentalization of the nearby, formerly marine, Guadalquivir Tertiary Depression during the Pliocene. The Triassic gypsums are presently affected by intense karstification in form of dolines and shafts, as well as other flat-bottomed depressions similar to poljes in the interfluve areas. Differential incision in the Guadamanil and Guadalporcún Rivers, located in the head of the Guadalete fluvial basin, seems to have conditioned the vertical development of karst forms in the region. The Guadalporcún River crosses the Zaframagón Rock through a short but deep gorge. The Rock has acted as an obstacle to the river incision and this has hampered its vertical erosion if compared to the one of the Guadamanil River. This differential incision has affected the development of absortion karst forms which drain to both rivers: dolines and shafts are deeper when draining to the Guadamanil River valley. The slopes of the valley are plenty of active and inactive springs, drawing a sequence of stepped outflow points, whose relative heights coincide with the general heights assigned to the Quaternary fluvial terrace levels regionally defined for the Guadalete River basin. All these aspects suggest a strong relationship between the Pleistocene vertical development of the Olvera-Zaframagón karst system and the behavior of the base level, both at regional and local levels.

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