The Sidi Ifni transect across the rifted margin of Morocco (Central Atlantic)
Vertical movements constrained by low-temperature thermochronology
R.J.G. Charton (NARG (North Africa Research Group), TU Delft - Applied Geology)
G. Bertotti (NARG (North Africa Research Group), TU Delft - Applied Geology)
Angel Arantegui (NARG (North Africa Research Group), The University of Manchester)
Luc Bulot (NARG (North Africa Research Group), Centre Saint Charles)
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Abstract
The occurrence of km-scale exhumations during syn- and post-rift stages has been documented along Atlantic continental margins, which are also characterised by basins undergoing substantial subsidence. The relationship between the exhuming and subsiding domains is poorly understood. In this study, we reconstruct the evolution of a 50 km long transect across the Moroccan rifted margin from the western Anti-Atlas to the Atlantic basin offshore the city of Sidi Ifni. Low-temperature thermochronology data from the Sidi Ifni area document a ca. 8 km exhumation between the Permian and the Early/Middle Jurassic. The related erosion fed sediments to the subsiding Mesozoic basin to the NW. Basement rocks along the transect were subsequently buried by 1–2 km between the Late Jurassic and the Early Cretaceous. From late Early/Late Cretaceous onwards, rocks present along the transect were exhumed to their present-day position.
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