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福建省天湖山煤矿区处于闽西南坳陷东条带,推覆构造极其发育,以F31和F1两条推覆断层表现最为突出。据矿区开采资料证实,F31断层下盘童子岩组为—总体向西倾斜向南倾伏、轴向NNE的紧密线状褶皱,断层较稀少;上盘构造复杂,断层发育,由F31所派生的低序次断层往往为逆掩或逆冲断层,与主断层面组成“入”字型构造,造成童子岩组地层多次重复,同时派生了更低序次的断层组成羽毛状构造。通过对F31推覆断层特征以及应力场分析研究,认为其演进过程为:童子岩期前后的成岩沉积—印支期侧向挤压形成褶皱—印支运动及其后由于侧向挤压形成软弱滑动面及断裂—燕山早期侧向挤压造成低角度推覆断层。根据该矿区构造研究成果,提出了矿区外围及深部的5个找煤方向。
The Tianhushan coal mine in Fujian Province is located in the eastern strip of the southwestern Fujian Depression. The nappe structure is extremely developed. The two thrust nappe faults, F31 and F1, are most prominent. According to mining data, it is confirmed that the Tongziyan Formation in the F31 subplate is characterized by tight linear wilts tilted southwestward and axially NNE with relatively few faults. The structure of the upper plate is complex and the fault develops, and is derived from F31 Low-sequence faults are often overthrust or thrust faults, forming a “” character structure with the main fault plane, causing the Tongziyan formation to repeat many times. At the same time, lower-order faulting forms a feather-like structure. Through the study on the characteristics and stress field analysis of the thrust fault in F31, the evolution process is thought to be: diagenetic sedimentation before and after Tongziyan period - fold-indentation formed by lateral extrusion during the Indosinian period and subsequent weakness due to lateral extrusion Sliding Faces and Fractures - Late Yanshan Latex Squeezing Causes Low-Angle Nappe Faults. According to the research results of the tectonic structure of the mining area, five coal-finding directions are proposed in the periphery and the deep of the mining area.