Folding and fracturing relationships from Jurassic limestones of South Rifian Ridges, Northern Morocco

• Autores: El Hassania Habibou, Hmidou El Ouardi, Mohamed Habibi, Eric Mercier
• Localización: Geogaceta, ISSN 0213-683X, Nº. 56, 2014, págs. 19-22
• Idioma: inglés
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• Resumen

  • The study of fractures affecting the Jurassic Ridges of Fert El Bir, Kefs and Outita from South Rifian Ridges, Northern Morocco, allowed us to propose a folding-fracturing model that summarizes the distribution of fractures within fault-propagation folds and the chronology of the different families of fractures occurring during the history of Miocene and Quaternary shortening phases, oriented NE-SW. At the beginning of compressional phase, sedimentary series corresponding mainly to limestones are deformed by layer parallel shortening (LPS) accompanied by pure shear causing thickening with the occurrence of oblique and transverse fractures. Following the establishment of the ramp fold, existing fractures are locally affected by simple shear within the two flanks of the fold and axial fractures are developed as a response of the accommodation of the surface folding.