南大巴山前陆冲断带中带构造样式及变形机制

南大巴山前陆冲断带自北向南发育了根带、中带和锋带三条构造带。通过对处于中带的木瓜口-明月乡、城口-龙田乡两段剖面地质考察,结果表明该剖面叠瓦断层带经历了七期运动:三期NE-SW向的前展式逆冲运动,一期SE-NW右旋剪切运动,一期EW逆冲右旋运动,一期NE-SW向的左旋走滑运动及NE-SW向的正断运动,同时受到NW-SE的右旋剪切作用。结合前人年代学研究结果,初步探讨了剖面的变形机制,研究结果对南大巴山前陆褶断带的构造格架、矿产形成及油气分布远景研究均有一定的指导作用。

Structural Styles and Their Deformation Mechanism in the Middle Zone of the South Dabashan Foreland Thrust Fault Belt

Three structural zones such as root zone,middle zone and frontal zone were developed in the South Dabashan foreland thrust fault belt.Field study of the middle zone in Muguakou-Mingyue and Chengkou-Longtian areas indicates that the imbricate fault zone have experienced seven movements,including three propagation thrust movements in NE-SW direction,one right-lateral shear movement in SE-NW direction,one thrust-right-lateral shear movement in E-W direction,one left-lateral shear movement and one normal-fault ...