Tectonic subsidence of the Longmenshan foreland basin in western Sichuan

The Longmenshan thrust zone is considered as the principal source area of the Longmenshan foreland basin in western Sichuan, and the thrusting as the main controls on sediment type and supply to the foreland basin. The greater tectonic subsidence rates appeared during the Norian and Rhaetian of the Late Triassic and early and middle Late Jurassic have reflected the greater thrusting and uplifting rates of the Longmenshan area during these periods. The smaller tectonic subsidence rates appeared during the Early Jurassic represent the smaller thrusting and uplifting rates of this area during this period. The thrusting and uplifting rates of the Longmenshan thrust nappe are estimated for various geologic times.