从川西龙门山前陆盆地上三叠统—侏罗系沉积纪录可以看出 ,早中侏罗世以后整个盆地地层构型为一个板状特征 ,但在其近造山带一侧的盆地边缘又有大量的冲积粗碎屑存在 ,砂砾质粗碎屑楔形体在早中侏罗世主要位于龙门山前缘中北段 ,而晚侏罗世—早白垩世则明显地向南西方向迁移 ,盆地在不同时期、不同部位和不同成分的砂砾质粗碎屑楔形体的时空展布显示物源迁移明显 ,这是龙门山造山带走滑作用沉积的产物。 From the records of the Upper Triassic-Jurassic sediments of the Longmenshan foreland basin in western Sichuan, it can be seen that the stratigraphic configuration of the whole basin after the Middle-Early Jurassic was a plate-like feature. However, on the margin of the basin on the side of the near orogenic belt A large amount of alluvial coarse crust exists. The gravelly coarse crust wedges are mainly located in the middle-northern segment of the Longmen Mountain in the early Middle-Middle Jurassic, while the Late Jurassic-Early Cretaceous migrate to the southwest obviously. In different periods, the spatiotemporal distribution of gravelly coarse wedges in different parts and compositions shows that the source rocks migrate obviously, which is the result of the sedimentation of Longmen Shan orogenic belt.