Abstract:
The Wuling fold-and-thrust belt is a prominent tectonic feature situated on the eastern margin of the Yangtze block. It represents a prime example of a linear tectonic zone resulting from compressional forces within the South China region. In view of the deep structure, tectonic style and intra-continental deformation mechanism in this area, this paper systematically analyzes the deep crustal structure, deformation process and shallow tectonic response in this area, taking a NW-SE tectonic corridor spanning a linear fold belt as an entry point, based on the integration of geophysical, tectonic geological and numerical/physical modelling studies in recent years. The results show that: (1) the formation of the strong gravity gradient zone in Wuling Mountains region is mainly controlled by the difference of the structure and physical properties of the crust and lithosphere; (2) The merging process of the Yangtze and Cathaysian blocks in Neoproterozoic caused the Moho subduction trace in SE direction in this area; (3) The far-field stress of the Paleo-Pacific plate subduction during the late Mesozoic was the main driving force of the fold-and-thrust deformation in this area; (4) The existence of low-velocity décollements layer not only caused the deformation decoupling of the upper and lower crust, but also controlled the formation process and deformation style of the entire fold-and-thrust bel tin this area, together with the existing Qiyuefault and Huaying fault.