煤系中常见的重力滑动构造

由于地壳运动而造成的势能差,在区域的拉伸构造环境及地震等触发因素影响下,最易在煤系中形成重力滑动构造。常见的构造形态为铲式正断层和勺状正断层。按断层上盘褶皱发育程度,每种正断层又可分为滑片型和滑褶型两种构造样式。煤系向斜两翼产生的重力滑动构造,可导致向斜轴部出现复杂的构造图象。充分认识以上构造之间的关系,无论在提高煤田地质构造理论仰或指导生产实践,均有一定的意义。

THE GRAVITY SLIDE STRUCTURES COMMONLY-FOUND IN COAL MEASURE

The potential energy difference produced by crustal movements, enfluenced by the triggering factors such as earthouake and regional tensional tectonlc process, will easily cause to form gravity slide structures in coal measures. Its common structural forms are the shovel-like normal fault and spoon-like normal fault. According to the development of folding in the hanging wall of the fault, the normal fault can be classified into two kinds of structural pattern as slide sheet type and slide fold type. The gravity slide structures occurred in both limbs of coal measure synclines will give rise to complicated structural image in the axial part of the syncline. A comprehensive understanding about the relationship among the above structures will be of certain significance to raise the level of coalfield geologic study and/or to guide the productive practice.