Structural evolution of the external zones derived from the Flysch trough and the South Iberian and Maghrebian paleomargins around the Gibraltar arc: a comparative study

• DOI: 10.2113/gssgfbull.177.5.267
• Publication Date: 2006-12-04T18:53:11Z
• Authors: Ana Crespo-Blanc; Dominique Frizon ...
• Keywords: Flysch; Accretionary wedge; Trough (economics); Outcrop; Anticline; Neogene

Abstract The Betics and Rif cordillera constitute the northern southern segments of Gibraltar arc. Two different fold-and-thrust belts, deriving from South Iberian Maghrebian paleomargins respectively, developed in front this orogenic system. By contrast, Flysch Trough units overlying Alboran crustal domain (internal zones), which are situated uppermost part wedge, common to both branches Flyschs an inactive accretionary prism, derived a deep elongated trough. From three large-scale profiles some lithostratigraphic features involved sedimentary sequences, Betic external domains compared, mainly structural point view. Although they generally considered show major similarities, fact strikingly different, concerning style, deformation timing metamorphism: a) thick-skinned structure External vs thin-skinned Subbetic domain; b) pre-Oligocene Miocene stacking exclusively one domain, c) metamorphism present only (low-grade greenschists facies). it was not possible establish any difference style between outcropping