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| Titel |
Curved thrusts from associated basin depocenters. Basement Paleozoique the morphologyc control. The Rides Prerifaines in the Volubilis Basin (Rif Cordillera, Morocco) |
| VerfasserIn |
Francisco Javier Roldán, Jesús Galindo, Patricia Ruano, Ahmed Chalouan, Antonio Pedrera, Mfedal Ahmamoud, Ana Ruiz, Carlos Sanz, Mohamed Benmakhlouf, Angel Carlos Lopez, Lourdes Gonzalez |
| Konferenz |
EGU General Assembly 2014
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 16 (2014) |
| Datensatznummer |
250091031
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| Publikation (Nr.) |
 EGU/EGU2014-5297.pdf |
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| Zusammenfassung |
| The Volubilis Basin is located between two structural arcs formed by the Prerif Ridges that developed during and after sedimentation (Roldán et al., 2013). The arcs correspond with WSW-verging anticline culminations, limited by NE-SW strike-slip lateral ramps (Chalouan et al., 2006). Sedimentary infill took place during two stages of ridge formation and propagation. The first stage occurred in the Middle Miocene-Early Tortonian? and was determined by the deposition of the Nappe Prérifaine in the northern part of the basin, and continental and marine sediments over the Prerif Ridges. The second one, Late Miocene in age (Tortonian-Messinian), corresponds to the sedimentation of calcarenites and bioclastic limestones at the basin edges, with a lateral transition to white and blue marls towards the center of the basin (Faugères 1978).
There is clear evidence of synsedimentary deformation, suggesting the interaction of sedimentation and tectonics. Geophysical data allow us to characterize the stratigraphic architecture of the Volubilis Basin and the geometry of the top of the Paleozoic basement. An approximately N-S Tortonian-Messinian asymmetric depocenter is located close to the front of the eastern arc. This research illustrates the nucleation, progressive thrust bending and segmentation, and the propagation of folds interacting with sedimentation. Thrust nucleation agrees with Paleozoic basement highs under the detachment surface (Roldán et al., 2013). The progressive development of these tectonic structures conditioned the formation, segmentation and final continentalization of the Volubilis Basin, which can be considered as a piggy-back basin (Roldán et al., 2009).
References:
Chalouan, A., Galindo-Zaldívar, J., Akil, M., Marín, C., Chabli, A., Ruano, P., Bargach, K., Sanz de Galdeano, C., Benmakhlouf, M., Ahmamou, M. and Gourari, I. (2006). Tectonic wedge escape in the southwestern front of the Rif Cordillera (Morocco) . In: Tectonics of the Western Mediterranean and North Africa (Ed. by G. Moratti, G. and A. Chalouan), Geol. Soc., London, Spec. Publ., 262, 101-118.
Faugères, J.C. (1978) Les Rides sud-rifaines: Evolution sédimentaire et structurale d’un bassin atlantico-mésogéen de la marge africaine, PhD Thesis, Univ. Bordeaux I, 480 pp.
Roldán, F.J., Galindo-Zaldívar, J., Chalouan, A., Anahnah, F., Ahmamou, M., Ruano, P., Ruiz-Constán, A., Sanz de Galdeano, C., Marín-Lechado, C. & López-Garrido, A.C. (2009) Relaciones entre tectónica y sedimentación asociadas a las Rides Prèrifaines en la Cuenca de Volubilis (frente del Rif, Marruecos). Geogaceta, 47, 137-140. |
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