正断层式移位断层反牵引现象的研究

STUDY ON COUNTER-DRAG OCCURRENCE NEAR FAULT

摘要: 断层附近的反牵引现象是正确判断断层性质,准确寻找断失盘煤层的一项非常重要的干扰因素。本文通过理论分析的方法,提出了一期构造力形成的正断层下降盘的反牵引褶曲与逆断层上升盘牵引褶曲在形态上的区别是,前者沿断层面向下滑的,褶曲较开阔,不形成岩层倒转;后者除断层倾向与岩层倾向相反时外,是沿断层面向上推的,褶曲较紧闭,且经常形成岩层倒转。本文还对两期构造力复合形成的正断层式移位断层的反牵引现象提出了新的解释,认为前期为挤压力,形成逆断层附近的牵引褶曲;后期为拉伸力,使两盘沿断裂面产生相对的升降。断层落差后期大于前期。

Abstract: In geological exploration work,counter drag occurrence near fault can be seen sometimes.Though this occurrence is rare,it usually causes great difficulty to geologists in identifying the features of faults and finding coal veins.Therefore,intensive research of counter drag occurrence near faults is of great practical importance to identify the features of faults and avoid ineffective footage of advance.