鄂尔多斯西缘马家滩滑脱型冲断构造

DETACHMENT-TYPE THRUST STRUCTURES IN MAJIATAN, WEST MARGIN OF ORDOS

汪泽成 王玉新

Wang Zecheng Wang Yuxin

鄂尔多斯西缘马家滩冲断带是一个典型的滑脱型冲断层带,石炭系煤系地层和沉积盖层与基底之间界面是主要滑脱层面。冲断层按成因分为底板冲断层、分支断层、反冲断层、横向断层4类。褶皱分为断展褶皱和断滑褶皱。冲断层带内存在反冲型、反冲切割型及分支断层型3种类型前缘构造样式和断层与断层、断层与褶皱两类构造转换。马家滩冲断带前缘带南端是油气勘探最有利地区。

Majiatan thrust belt in the west margin of Ordos Basin is a typical detachment thrust belt.The main detachment beds are Carboniferous coal measures and the boundary plane between basement and sedimentary cover in the area.The genetic types of the thrusts are floor thrust, branch thrust, recoil fault and cross fault.The fold types of the thrust belt include fault-extended fold and fault-slided fold.The thrust belt contains recoil, recoil-cut and branch types of frontal structures and two structural transformation forms such as thrust to thrust and thrust to fold.The south end of the thrust front is favourable for oil and gas exploration.

10.11743/ogg19960310