Structure et contrôle paléogéographique de la zone subandine péruvienne

Abstract

The north–south structural evolution in the Subandean zone (eastern side of the Central Andes) reflects the complexity of the orogenic front that propagates on an heterogeneous substratum inherited from pre-Andean palaeogeographies. The construction of balanced cross-sections shows that this north–south evolution corresponds to a progressive transformation from thick-skin transpressive deformation to thin-skin compressive deformation. The thrust front propagation is controlled, in the north, by NNE–SSW to north–south rift systems Permo-Triassic to Jurassic in age, oblique to the chain, and in the south, by the relatively isopach series of the preserved Palaeozoic silico-clastic platform.