Applying a general triclinic transpression model to highly partitioned brittle-ductile shear zones: A case study from the Torcal de Antequera massif, external Betics, southern Spain

Kinematics of the Torcal Shear Zone: Transpressional tectonics in a salient-recess transition at the northern Gibraltar Arc

“…1), i.e. along the Torcal Shear Zone (Barcos et al, 2011;Díaz-Azpiroz et al, 2014) that involves rocks belonging to the innermost South Iberian Domain. Actually, the southern TSZ wall forms the current boundary between the South Iberian units and the Alboran Domain.…”

“…2). The kinematics of structural associations within the central sector of the TSZ (the Torcal de Antequera massif), mainly E-W dextral strike-slip faults and NE-SW oriented folds and reverse faults, indicate a dextral transpressive regime (Barcos et al, 2011;Díaz-Azpiroz et al, 2014). Preliminary data taken in other massifs along the TSZ fit well within this general kinematic scheme, though significant differences in strain-partition modes and structural relationships between the TSZ and the nearby structural domains have been described (Barcos et al, 2012).…”

“…The Torcal de Antequera massif is deformed by a variety of structures with diverse geometry and kinematics (Barcos et al, 2011;Díaz-Azpiroz et al, 2014). The main structures are brittle to brittleductile reverse, strike-slip and normal shear zones, as well as open folds (Fig.…”

“…1). Salient-recess transitions are characterized in both cases by essentially brittle strike-slip dominated shear zones: the Torcal Shear Zone (TSZ) (Barcos et al, 2011;Díaz-Azpiroz et al, 2014) and the Jebha Fault Zone (Leblanc and Olivier, 1984). Tectonophysics xxx (2015) xxx-xxx ⁎ Corresponding author.…”

“…Kinematics of the central part of the TSZ has been recently studied by applying theoretical analytical models of general transpression (Díaz-Azpiroz et al, 2014), but a regionally integrated structural analysis of the complete TSZ has not been attempted yet. Moreover, theoretical models have not been applied out of the Torcal de Antequera massif within the central sector of the shear zone.…”