RT Journal Article
T1 Kinematics of the Torcal Shear Zone: Transpressional tectonics in a salient-recess transition at the northern Gibraltar Arc
A1 Barcos, L.
A1 Balanyá Roure, Juan Carlos
A1 Díaz Azpiroz, Manuel
A1 Expósito Ramos, Inmaculada
A1 Jiménez Bonilla, Alejandro
K1 Map-view curves
K1 Gibraltar Arc
K1 Oblique convergence
K1 Triclinic transpression
K1 Strain partitioning
AB Complex strain patterns in the Gibraltar Arc derive from the interaction between the westward drift — and concomitant back-arc extension — of the arc hinterland (Alboran Domain) and the Europe–Africa convergence. In order to explore strain partitioning modes within the arc and the role played by large-scale oblique structures, we have studied the kinematics of the Torcal Shear Zone located at the northern branch of the Gibraltar Arc.The Torcal Shear Zone is a 70 km-long, E–W brittle-ductile shear zone that underwent overall dextral transpression during the Late Miocene to Quaternary time. Within the Torcal Shear Zone strain is highly partitioned at multiple scales into shortening, oblique, extensional and strike-slip structures. Moreover, strain partitioning is heterogeneous along-strike giving rise to four distinct structural domains. In the central sector the strain is pure-shear dominated, although narrow sectors parallel to the shear walls are simple-shear dominated. A single N99°E–N109°E trending horizontal velocity vector () could explain the kinematics of the entire central sector of the Torcal Shear Zone. Lateral domains have different strain patterns and are comparable to splay-dominated and thrust-dominated strike-slip fault tips.The Torcal Shear Zone provokes the subvertical extrusion of the External Betics units against the Alboran Domain and a dextral deflection of the structural trend. Moreover, the estimated  points to the importance of the westward motion of the hinterland relative to the external wedge and fits well with the radial outward thrusting pattern identified in the arc.
PB Elsevier
YR 2015
FD 2015-11
LK https://hdl.handle.net/10433/22676
UL https://hdl.handle.net/10433/22676
LA en
NO Barcos, L., Balanyá, J. C., Díaz-Azpiroz, M., Expósito, I., & Jiménez-Bonilla, A. (2015). Kinematics of the Torcal Shear Zone: Transpressional tectonics in a salient-recess transition at the northern Gibraltar Arc. Tectonophysics, 663, 62-77.
NO Departamento de Sistemas Físicos, Químicos y Naturales
DS RIO
RD Apr 23, 2026