滇东地区煤田构造格局与煤系赋存规律的研究

摘要

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.