Abstract
Fault slip analyses were carried out on Cretaceous to Lower Tertiary formations in the Mons Basin. The results were compared with the four main stages of subsidence. The successive palaeostresses were: 1. (1) a N-S “Wealdian” extension, probably related to karstic dynamics; 2. (2) a NW-SE extension during the late Campanian; 3. (3) a NE-SW extension during the early Maastrichtian, characterized by a pull-apart process; and 4. (4) N-S and E-W extensions that occurred during the Tertiary. The pull-apart mechanism can be observed in the “La Malogne” underground quarry, where synsedimentary tectonic features are particularly well developed. This is fairly consistent with the right-lateral motion along the “Nord-Artois” shear zone. The tectonic evolution of the Mons Basin is related to the geodynamic evolution of the North Sea and of the European Platform.
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