滇东地区煤田构造格局与煤系赋存规律的研究

Study on Coalfield Structural Framework and Coal Measures Hosting Pattern in Eastern Yunnan Area

滇东地区位于特提斯和环太平洋构造体系的交接部位,煤田构造格局的总体特征是呈NNE向条带状展布。区内断层以NNE、NE向为主,受主要断裂影响,煤田在南北向呈带状,东西向呈段状展布,各煤矿区在平面上呈NE向带状分布。研究区煤系赋存受基底主干断裂的控制作用明显,变形强度由北向南逐渐增强,北部地区以褶皱构造为主,断层较少,煤层多保存于向斜构造中,保存较完整,煤层埋藏较深;南部受弥勒-师宗断裂带影响,断裂构造极为发育,对煤层破坏严重,煤系赋存不稳定。

The eastern Yunnan area is located at the conjoined position between the Tethyan and circum-Pacific tectonic systems;the structural framework of the coalfield presents a NNE trend zonal distribution.Most faults in the area are NNE and NE trending,coalfields present belts from north to south,segments from east to west,and coalmine locations present a NE zonal distribution.Coal measures are obviously controlled by basement major faults,from north to south,the thrusting becomes stronger.In the north,folds are rather well developed and coal measures mostly hosted in synclines;because of less crustal stress,coal-bearing synclines are rather well preserved,but coal seams buried depth is deeper.While in the south,since impacts from the Mile-Shizong faulted zone,faults are rather well developed,thus stronger succeeding alteration of coal measures and seriously destructed coal seams.