Abstract
The Rides Prerifaines (RP) of Morocco constitute the leading edge of the Rif chain. They involve a Triassic–Palaeocene succession deposited on a peneplained Palaeozoic fold belt and accumulated in basins delimited by NE–SW-trending normal fault systems. A significant hiatus separates an overlying Middle Miocene–Upper Miocene foredeep sequence. The reconstruction of the complex structural evolution of the RP during the later compressive phases that affected the Rif chain since Middle Miocene time has been the aim of this paper. We integrated field structural analyses, seismic line interpretation, and analogue modelling in order to evaluate the control exerted by the Late Triassic–Jurassic normal fault systems onto the later compressive tectonics. The maximum compression direction associated with the first compressive phase is roughly NE–SW to ENE–WSW oriented. During this phase the Mesozoic basin fill was scooped-out from the graben and the main décollement level were the Triassic evaporites. Since Pliocene times the maximum compression direction was oriented roughly N–S. During this phase the RP assumed their present structural setting. The earlier normal faults delimiting the Mesozoic graben were reactivated in a strike–slip mode also involving the Palaeozoic basement. The analogue modelling experiments demonstrated that the basement reactivation promoted salt tectonics and favoured fluid circulation.
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Acknowledgments
This work strongly benefited from the discussion with Prof. A. W. Bally, who is warmly thanked also for making available a lot of material about the area. ONAREP (now ONHYM) is also thanked for providing seismic sections and well logs studied and illustrated in this work. Dr. M. Dahmani, past Director of the Geological Survey of Morocco, is warmly acknowledged for his help during fieldwork years and for useful suggestions. Useful discussion in the field with M. Boccaletti, R. Gelati, G. Moratti and G. Papani greatly improved the paper. Anonymous referees and Prof. R. Greiling are also thanked for their help in improving the manuscript. Field work was funded by Italian Consiglio Nazionale delle Ricerche (CNR), Ministero dell’Università e della Ricerca (MIUR) and by the bilateral project between CNR (Italy) and CNRST (Morocco) “Structural analysis, active tectonics and fluids geochemistry in the Rif-Middle Atlas-High Atlas System of Morocco” (Italian responsible Dr. G. Moratti)
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Sani, F., Del Ventisette, C., Montanari, D. et al. Structural evolution of the Rides Prerifaines (Morocco): structural and seismic interpretation and analogue modelling experiments. Int J Earth Sci (Geol Rundsch) 96, 685–706 (2007). https://doi.org/10.1007/s00531-006-0118-2
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DOI: https://doi.org/10.1007/s00531-006-0118-2