淮北煤田孙疃煤矿构造特征及其演化

摘要

The Suntuan coalmine, Huaibei coalfield is situated in the east wing middle sector of Tongting anticline, a near NS mono⁃cline dissected by a series of NE normal faults. On the basis of systematic analysis of coalmine geological data, combined with Huaibei coalfield tectonic features, discussed different staged tectonic stress fields and their impacts on minefield structures, revealed their for⁃mation mechanism. The study has shown:①The minefield can be divided into 3 structural subareas from north to south, minor faults in each block have different structural features.②Linear correlation exists between fault throws and extending lengths of minor faults, linear regression equation obvious.③After the Permo-Carboniferous coal-bearing strata deposited, the area has experienced two stag⁃es of major tectonic movements, the NWW-SEE strong compression during early stage of Yanshanian movement formed conjugate faults in the area;later stage NNE-SSW compression formed NE master faults and a mass of minor faults.%淮北煤田孙疃煤矿位于童亭背斜东翼中段，为一地层走向近南北的单斜构造，被一系列走向NE的正断层所切割。在系统分析煤矿地质资料基础上，结合淮北煤田区域构造特征，探讨了不同期次构造应力场及其对井田构造的影响，揭示了该矿构造形成机制。研究结果显示：①孙疃井田自北向南可以划分为3个构造分区，各区块小断层具有不同构造特征。②小断层断距与延展长度之间存在线性相关关系，回归直线方程是显著的。③石炭-二叠系含煤地层沉积后，经历了两期较大的构造运动，早燕山期NWW-SEE向强烈挤压作用形成区内共轭断层；晚燕山期NNE-SSW向挤压形成区内NE向的主控断层及大量的小断层。