福建省广平煤矿区推覆体下煤系地层构造特征

广平煤矿区属典型隐伏煤田，经历了多期次构造运动的叠加和改造，煤系地层总体呈一向斜构造，煤系地层保留的厚度在向斜边缘厚度大，往中、北部变薄甚至缺失。区内发育的广平推覆构造属于褶皱推覆构造，有倒转褶皱、“之”字形褶皱、复式背向斜褶曲和不协调褶皱等，区内断距大于20m的断层较少，5m以下的小断层和走向断层较为发育。分析认为广平推覆构造对煤层具有建设和破坏双重作用。

Under Nappe Coal Measures Strata Structural Features in Guangping Coal Mine Area,Fujian Province

The Guangping coal mine area is a typical concealed coalfield, has experienced multi-phase superposition of tectonic movements and transformation. Coal measures strata in general appearing as a synclinal structure, the retained thickness of coal measures strata is large at the edges of the syncline, to the middle and northern part becomes thin or even missing. Guangping nappe structure belongs to fold nappe structure, includes overturned folds, ＂zig＂ shaped folds, composite anticlinal and synelinal folds, disharmonic folds, etc. Fewer faults with throw larger than 2Ore, but small faults with throw less than 5m and strike faults are more developed. Based on the above analysis, Guangping nappe structure has dualism of building and destruction to coal seams.