Acreción Miocena del Dominio Suribérico y del Complejo de Flyschs (Arco de Gibraltar): una revisión a partir de las propuestas de V. García-Dueñas

Resumo

The Western Mediterranean tectonics and the convergence of the Iberian and African plates, resulted in one of the tightest orogenic arcs in Earth, the Gibraltar Arc System. Extensively studied by V. García-Dueñas and co-workers through various approaches, it is well established that its external part is built up by units which derived from the South Iberian and Maghrebian palaeomargins, together with other tectonic elements that derived from a deep trough, the Flysch Trough, which developed above oceanic or thinned continental crust. The hinterland of the Arc, the Alboran Domain, has a composite metamorphic-terrane character. It underwent rifting that gave rise to the Alboran backarc Basin during Miocene times. Recent studies were carried out on the Gibraltar Arc external orogenic wedge (Subbetic Domain and Flysch Complex), both in central and western Betics, in terms of detailed geometry, kinematic analysis and analogue modelling. Taking into account the proposals of V. GarcíaDueñas, the accretionary evolution of both the central and western Betics is compared. We mainly focus on the following topics: a) characterization of the tectonic styles and kinematics of the foldand-thrust systems; b) timing of the structures (revealing diachrony along the northern branch of the Arc) and of the remagnetization in the Subbetic rocks; and c) identification of strain partitioning modes, in particular those which reveal arc-parallel stretching, extensively observed along the Western Gibraltar Arc.