The basin-range coupling in southern North China block during the Late Palaeozoic to Triassic

A variety of sedimentay basins are developed in southern North China block during the Late Palaeozoic to Triassic.The formation and evolution of the basins are directly controlled by major orogenic processes in the Qinling orogenic belt.-According to the orogenic intensity and basin-range coupling,three phases may be recognized for the collisional orogenic processes.The initial point collision occurred in the Devonian and Carboniferous,during which the Palaeo-Qinling Ocean and Erlangping back-arc basin were simultaneously consumed,and then evolved into their respective remnant oceanic basin and remnant back-arc basin grounded upon the continental crust. The plane collision took place during the Permian,when the northern Qinling began to be uplifted as a northerly source of siliciclastic sediments. Afterwards, the basinal area was initiated in southern North China block in response to the consumption of the Shangdan-North Huaiyang suture zone and remnant island-arc basins, and is believed to be a depocentre of the North China epeiric sea during the Early Permian.The final complete collision of Qinling and North China block took place during the Triassic,resulting in the formation of a large-sized depressed lake basin within the North China block against a background of the extensive metamorphism and deformation of the orogenic belt and collision-related granitic magmatism in the Qinling area.