Desacoplamiento de la deformación en la base de la lámina cabalgante del Dominio de Alborán (Béticas Occidentales)
- Juan Carlos Balanyá 1
- Inmaculada Expósito Ramos 1
- Alejandro Jiménez-Bonilla 1
- Manuel Díaz-Azpiroz 1
- Mario Sánchez-Gómez 2
- Ana Crespo-Blanc 3
- 1 Departamento de Sistemas Físicos, Químicos y Naturales, Universidad Pablo de Olavide (Sevilla)
- 2 Dpto. Geología, Universidad de Jaén, Campus de las Lagunillas (Jaén)
- 3 Dpto. Geodinámica, Universidad de Granada, Campus Fuentenueva. Instituto Andaluz de Ciencias de la Tierra (UGR-CSIC) (Granada)
ISSN: 0213-683X
Year of publication: 2022
Issue: 72
Pages: 23-26
Type: Article
More publications in: Geogaceta
Abstract
In the Western Betics, the Alboran Domain crystalline thrust sheet (ATS) overlies the Frontal Units (FU) and the inner part of the fold-and-thrust belt (FTB). We analysed the tectonic style and transport directions of the ATS and compared them with those of the overthrusted units. Our results indicate that the internal deformation within the ATS, coeval to the sheet emplacement, is moderate and mainly consists of accommodation folds striking N-S to N20ºE, these folds being developed above the frontal hangingwall ramp.Large-scale upright folds deforming the rear part of the thrust sheet are probably the same age (early-middle Miocene). Moreover, the tectonic transport directions of the ATS (N270º-280ºE) are parallel to those of the FTB units in the western front. By contrast, the FU and the FTB show transport directions oriented N310º-320ºE in the northern front. These variations and the abrupt changes in tectonic style between the ATS and the FU/FTB units indicate a high grade of decoupling between the two ensembles.