龙门山南段大型飞来峰

最近１∶５×１０４区调查明的白石－苟家大型飞来峰，面积达３２０ｋｍ２，其规模仅次于唐王寨飞来峰，由泥盆系养马坝组至三叠系嘉陵江组构成，准原地系统为上三叠统须家河组及侏罗系红层。飞来峰主体构造为向斜，两翼不对称，内部构造的规律性和运动学特征表明它是由ＮＷ方向滑来。飞来峰体具多层结构，在其就位后又受到晚期挤压的改造。其主要特征与唐王寨构造极为相似。飞来峰的成因研究对龙门山的构造演化具有重要意义。

THE LARGE SCALED KLIPPES AT THE SOUTH SECTION OF THE LONGMEN MOUNTAINS

The Baishi Goujia large scaled klippe, located at the south section of the Longmen Mountains, Sichuan Province has been confirmed recently. It covers an area of 320 km 2, slightly smaller than the Tangwangzhai klippe. The strata include formations from the Lower Devonian to the Lower Triassic. The para autochthone is the Upper Triassic Xujiahe Formation and the Jurassic Red Beds. Its main structure is a syncline with unsymmetrical limbs.The regularity and the kinematic characteristics of its inner structure are very typical, which indicates that the klippe was a gravity gliding nappe from Northwest. The klippe is multi layer structure and was compressed after it took its place.The key feature is very similar with the Tangwangzhai structure. Studying the klippe is of significance for the tectonic evolution of the Longmen Mountains.