辰溪矿区逆冲推覆构造与伸展构造研究

Characteristics of Thrust Nappe and Extensional Structures in Chenxi Coal Mining Area

依据野外勘察、钻探和矿井开采资料进行综合分析，阐述了辰溪矿区逆冲推覆构造和伸展构造的几何学特征、运动学特征及其组合规律．在此基础上，分析了逆冲推覆构造和伸展构造对煤层的控制作用．研究表明，辰溪矿区的推覆构造由３条倾向ＳＥ—ＳＳＥ的逆冲断层带组成，剖面上构成由ＳＥ向ＮＷ逆冲推覆的逆冲叠瓦扇；推覆构造常将含煤地层压在老地层之下，是本区找煤最有希望的地段；重力伸展构造上盘的下滑，常使煤层免受剥蚀而得以保存．

The data obtained from field prospecting, drilling, and mining are analyzed synthetically. Geometry and kinematics as well as the combinative rule of thrust nappe and extensional structures in Chenxi coal mining area are introduced. On the basis of this, the action of the structures controlling the coal formation is studied. The research shows: The nappe structure in Chenxi mining area is composed of three thrust faults whose dip direction is SE—SSE; In section, it forms an imbricate fan thrust from SE to NW; The nappe structure causes the coal bearing measures to be buried under the old strata, and it is the hopeful place for coal resource; The down slipping of hanging wall of extensional faults prevents coal seams from being denuded.