Neo-tectonic reactivation and relief rejuvenation in the western Betics foreland (Viar catchment)

  1. J. L. Yanes 1
  2. I. Expósito 1
  3. A. Jiménez Bonilla 1
  4. F. Moral Martos 1
  5. J.C. Balanyá 1
  6. E. García Navarro 2
  1. 1 Universidad Pablo de Olavide
    info

    Universidad Pablo de Olavide

    Sevilla, España

    ROR https://ror.org/02z749649

  2. 2 Universidad de Huelva
    info

    Universidad de Huelva

    Huelva, España

    ROR https://ror.org/03a1kt624

Zeitschrift:
Geogaceta

ISSN: 0213-683X

Datum der Publikation: 2019

Titel der Ausgabe: Comunicaciones presentadas en la LXVI Sesión Científica / Leioa (Bilbao), 24 de mayo de 2019

Nummer: 66

Seiten: 107-110

Art: Artikel

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Andere Publikationen in: Geogaceta

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Zusammenfassung

We analyze the recent tectonic activity recorded in the Viar catchment (Betics foreland), combining structural and geomorphic tools. Our results indicate that recent, probably Quaternary, tectonic activity is responsible for relief segmentation, both parallel and perpendicular to the limit between the foreland of the Betics and the Guadalquivir foreland basin. Thus, uplift of the Viar catchment boundaries seems to be controlled by the presence of previous structures, reactivated as NW-SE oblique reverse faults at its NE boundary and oblique normal faults, close to E-W orientation, at its SW boundary. Additionally, SW-NE oblique normal faults are associated with the topographic escarpment that separates the Iberian Massif and the Guadalquivir foreland basin. They must have elevated the Iberian Massif before the subsidence of the Viar catchment occurred, given that the Neogene sediments of the Guadalquivir basin do not extend within the southernmost Viar catchment although its floor is at the same altitude as the Neogene outcrops in the northermost Guadalquivir basin. The contrasting kinematics accommodating relief rejuvenation point to the superposition of shortening, probably due to Alpine intraplate deformation, and extension related to forebulge flexion.

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This study was supported by project CGL2017-89051-P and PGC2018-100914- B-I00. We appreciate the reviews of A. Azor and J.M. Azañón, which have improved significantly our manuscript.
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