Morphotectonics of the Concud Fault (Iberian Chain, Spain) : comparing geomorphic and geologic indices of activity of an intraplate extensional fault

Auteur(s) et Affiliation(s)



Description :
The results of geomorphic analysis of the Concud fault-generated mountain front (central Iberian Chain, Spain) are introduced into classifications of fault activity proposed by previous authors, and compared with slip rates calculated from geologic markers. The Concud fault is an extensional structure active since the mid Pliocene times. The geomorphic indices, together with qualitative features of the escarpment and piedmont landscape, indicate ‘moderate’ to ‘rapid’ fault activity. The range of slip rates estimated from such morphotectonic classification (0.03 to 0.5 mm/y) encloses the range calculated from offset Late Pliocene and Pleistocene stratigraphic markers (0.07 to 0.33 mm/y). Nevertheless, the highest potential slip rate (0.5 mm/y) clearly represents an overestimate : the mountain front could give the impression of an anomalously high level of activity owing to episodic rejuvenation caused by base level drop.


Type de document :
Article de périodique

Source :
Geodinamica acta, issn : 0985-3111, 2011, vol. 24, n°. 3-4, p. 107-122, nombre de pages : 16, Références bibliographiques : 63 ref.

Date :
2011

Editeur :
Pays édition : Royaume-Uni, Abingdon, Taylor and Francis