Salt tectonics in the SW Alps (Italy–France): From rifting to the inversion of the European continental margin in a context of oblique convergence

摘要: Abstract The SW Alps result from the inversion of European continental margin during oblique convergence between Europe and Adria since Cretaceous. orogenic deformation is controlled by two factors: inherited sedimentary structural record geodynamic interaction plates. In this paper we present a stratigraphic analysis external (Ventimiglia–Menton area) in order to define deformational geometries chain reconstruct evolutionary history. field-data highlight preeminent role played salt-structures, which derive depositional history experienced Mesozoic onwards. From Late Triassic Jurassic, evaporites carbonates deposited as response Thetyan rifting. following emplacement Cretaceous flysch Eocene foreland basin succession was strongly influenced extensionally-triggered salt diapirism interactions with deformations connected Pyrenees dynamics. resulting geologic discontinuities (i.e. diapir-induced highs basins, normal trasform faults) successive Oligo-Miocene evolution belt study area. Observed changes thrusts folds kinematics are considered results rotation their approaching highs. Furthermore, overturning front diapiric flanks associated progressively squeezing into anticlines cores promoted ongoing Alpine compression. Finally, kinematic data area show radical differences tectonic transport direction respect rest (NW- W-ward Ventimiglia–Menton area, S- SW-ward Provence Ligurian Alps). This difference interpreted be caused relative motions crustal blocks dominated transpressive tectonics frame western Mediterranean geodynamics.