Subsidence history from a backstripping analysis of the Permo-Mesozoic succession of the Central Southern Alps (Northern Italy)

摘要: Seven tectonic subsidence curves, based on outcrop data, have been calculated in order to constrain the geodynamic evolution of Permian-Mesozoic sedimentary succession (up 10 km thick) Central Southern Alps basin (Italy). The analysis covering a time span about 200 Ma, allowed us quantify rates, document activity syndepositional fault systems and calculate their slip rates. Different stages, terms duration magnitude subsidence-uplift trends, identified basin. activity, reconstructed by comparing curves from adjacent sectors, resulted as highly variable both temporally spatially. Strike-slip tectonics was coeval Permian sedimentation, suggested strong differences rates sections. suggest continental shelf deposition Early Triassic Carnian, when came stop. A rapid resumption is observed Norian, with pulse Late followed regional uplift, Rhaetian. following Jurassic characterized similar that Norian. Norian pulses were highest along growth faults are two distinct events. TheNorian-Rhaetian event tentatively related transtensional whereas crustal extension. records shift space an beginning extensional stage, from Hettangian east Pliensbachian-Toarcian west. From Toarcian Aptian, compatible thermal subsidence, later (Albian-Cenomanian) uplift retrobelt foreland (from Cenomanian onward).