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Post-rift vertical movements and horizontal deformations in the eastern margin of the Central Atlantic: Middle Jurassic to Early Cretaceous evolution of Morocco
Authors:Giovanni Bertotti  Mohamed Gouiza
Institution:1. Department of Geoscience and Engineering, Delft University of Technology, Stevinweg 1, 2628 CN, Delft, The Netherlands
2. Department of Tectonics and Structural Geology, VU University Amsterdam, De Boelelaan 1085, 1081 HV, Amsterdam, The Netherlands
3. Netherlands Research Centre for Integrated Solid Earth Science (ISES), Amsterdam, The Netherlands
4. Department of Earth Sciences, Memorial University Newfoundland, St. John’s, Canada
Abstract:Wide regions of Morocco, from the Meseta to the High Atlas, have experienced km-scale upward vertical movements during Middle Jurassic to Early Cretaceous times following the appearance of oceanic crust in the Central Atlantic. The area experiencing exhumation was flanked to the W by a domain of continuous subsidence, part of which is named the Essaouira-Agadir basin. Comparison with vertical movement curves predicted by lithospheric thinning models shows that only 50–60?% of the subsidence documented in the Essaouira basin can be explained by post-rift thermal relaxation and that <30–40?% of the observed exhumation can be explained by processes (in)directly related to the evolution of the Central Atlantic rifted margin. Syn-sedimentary structures in Middle Jurassic to Lower Cretaceous formations of the Eassouira-Agadir basin are common and range from m-scale folds and thrusts to km-scale sedimentary wedges. These structures systematically document coeval shortening generally oriented at high angle to the present margin. As a working hypothesis, it is suggested that regional shortening can explain the structural observations and the enigmatic vertical movements.
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