Strain decoupling at the base of the Alboran Domain crystalline thrust sheet (Western Betics)

Authors

  • Juan Carlos Balanyá Dpto. Sistemas Físicos, Químicos y Naturales, Universidad Pablo de Olavide, Sevilla,
  • Inmaculada Expósito-Ramos Dpto. Sistemas Físicos, Químicos y Naturales, Universidad Pablo de Olavide, Sevilla,
  • Alejandro Jiménez-Bonilla Dpto. Sistemas Físicos, Químicos y Naturales, Universidad Pablo de Olavide, Sevilla,
  • Manuel Díaz-Azpiroz Dpto. Sistemas Físicos, Químicos y Naturales, Universidad Pablo de Olavide, Sevilla,
  • Mario Sánchez-Gómez Dpto. Geología, Universidad de Jaén.
  • Ana Crespo-Blanc Dpto. Geodinámica, Universidad de Granada - Instituto Andaluz de Ciencias de la Tierra (UGR-CSIC), Armilla (Granada)

DOI:

https://doi.org/10.55407/geogaceta98397

Keywords:

accommodation folds, crystalline thrust sheet, strain decoupling, Betics

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.

References

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Published

2022-12-11

How to Cite

Balanyá, J. C., Expósito-Ramos, I., Jiménez-Bonilla, A., Díaz-Azpiroz, M., Sánchez-Gómez, M., & Crespo-Blanc, A. (2022). Strain decoupling at the base of the Alboran Domain crystalline thrust sheet (Western Betics). GEOGACETA, 72, 23–26. https://doi.org/10.55407/geogaceta98397

Issue

Vol. 72 (2022): July_December

Section

Artículos

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