龙门山彭灌地区大鱼洞-九甸坪-龙溪滑覆体的变形特征及形成

TECTONIC DEFORMATION FEATURE AND FORMATION MECHANISM OF THE DAYUDONG-JIUDIANPING-LONGXI GLIDING NAPPE IN PENG-GUAN AREA, WESTERN SICHUAN

论述了彭灌地区大鱼洞—九甸坪—龙溪滑覆体的构造变形特征,将其划分为南北两个滑覆体,二者以侧向镶嵌方式相连。北段为滑褶式,由两个呈上叠方式的次级滑覆体组成;南段为滑片式。滑覆体是在挤压推覆构造的后期具松弛性质的地球动力学环境下形成的,其来源于映秀—北川断裂东侧地区。滑覆活动于印支晚期至早燕山期。

This paper describes the deformational feature of the DayudongJiudianpingLongxi gliding nappe in the PengGuau area, western Sichuan. It divides the nappe into two subglidingnappes which are connected with each other laterally. The north subnappe consists of a number of folded superposed little nappes. The south subnappe also shows a superposition feature, but no folds are found. The gliding nappe comes from the east of the YingxiuBeichuan fault zone. The gliding movements worked under the loose geodynamic environment after compression during Mesozoic.