IPOTESI SULLA GEOMETRIA E LA GENESI DEI BACINI EUXINICI DEL TRIAS SUPERIORE IN AP­PENNINO CENTRALE

Abstract

During the Upper Triassic (Norian) the Centra! Apen­nines area was affected by extensional tectonics associated with the intracontinental rifting of the future southern mar­gin of the Tethys. These movements generated intra-platform basins characterized by euxinic deposition. The genesis and evolution of these basins was controlled by present-day E-W trending faults, which can be interpreted in two different ways; as sinistral strike-slip master faults, locally producing pull-apart basins; or as transfer faults linking different segments of an extensional belt (present-day trend N-S). Alternatively, the basins could be due to loca! collapse effects, in response to a regional uplift. To address this problem, kinematic reconstructions of the complex Cenozoic Apenninic thrustphases is needed to restore the euxinic basins to their origina! position.