淮北煤田五沟煤矿构造特征及其演化

Structural Features and Evolution in Wugou Coalmine, Huaibei Coalfield

淮北煤田五沟煤矿位于童亭背斜西翼中段,为一向斜为主的复式褶皱构造组合,向斜的轴部呈反S形且被断层切割。在系统分析煤矿地质资料的基础上,结合区域构造演化,探讨了构造发育特征、构造演化历史及其形成机制。结果认为:①五沟矿区可以划分为北部断裂构造复杂区、中部褶皱叠加区和南部构造复杂区3个构造分区,断裂构造的组合形式主要有"入"字型、"Y"型、堑垒式及阶梯式。②矿区构造的形成及演化受区域构造控制明显,印支期NS向构造挤压作用形成了近EW向的五沟断层,末期形成五沟复向斜构造;燕山期NW—SE向强烈的挤压作用形成了区内最为显著的NE向断裂及褶皱构造;喜马拉雅期的构造伸展作用造成拉张性构造发育,同时也使区内大、中型主控断裂转变为正断层性质。

Structures in the Linhuan mining area, Huaibei coalfield are rather complicated. The Wugou coalmine is situated in the middie sector, west limb of Tongting anticline, Linhuan mining area, within a mainly syncline compound folded structure combination, the counter S shaped syncline axis is cutting by faults. Based on systematic analysis of geological data concerning Wugou coalmine, combined with tectonic evolution, have discussed structural development features, evolution history and formation mechanism. Then summed up： ① Wugou mine area can be divided into 3 structural zones： complicated faulted zone in the north, superimposed folded zone in the middle and structurally complicated zone in the south; faulted structure combination forms have k type, Y type, grabenhorst type and stepped type. （~） Mine area structural formation and evolution are obviously controlled by regional tectonics, the IndoChinese epoch NS tectonic compression caused the formation of near EW Wugou fault, then ended by the formation of Wugou synclinorium; the Yanshanian epoch NW-SE intensive compression caused the formation of most distinctive NE faults and folds in the area; while the Himalayan epoch tectonic extension caused the formation of developed tensional structures, meanwhile transformed large and middle sized main controlling faults in the area into normal faults.