湖南梅城—寒婆坳地区煤田显微构造成因

从显微尺度分析了湖南梅城-寒婆坳地区岩石中出现较多的显微构造现象，并结合区域构造背景，从宏观和微观角度分析了研究区煤田构造成因。结果表明，研究区以低温脆性变形为主，多组裂隙的交错发育表明了应力场的多期次性，应用缝合线反演得出研究区印支期第Ⅰ期NW-SE向为最大主压应力场，第Ⅱ期NE-SW向挤压应力场次之；平均差应力为50~70 MPa，表明印支期以来煤田构造变形过程中，岩石经历了中等偏低强度的构造应力作用。梅城-寒婆坳地区煤田构造是在脆性-脆韧性变形为主的多期次中等偏低强度的复杂构造运动条件下形成的。 

Genesis of microstructure in coalfield in Meicheng-Hanpo'ao area of Hunan

The microstructural phenomena in the rock of Meicheng-Hanpo'ao area were analyzed from the microscopic scale, in combination with the regional tectonic background, the genesis of structure in the coalfield was analyzed from macroscopic and microscopic analysis. The results show that the study area is dominated by low temperature brittle deformation, multiple fracture sets show that the staggered development of the stress field in several times, the maximum principal compressive stress field of NW-SE direction in the first phase of Indosinian period was obtained by inversion of stylolites and the NE-SW compressive stress field in the second phase. The average differential stress is 50~70 MPa, shows that since the Indosinian tectonic deformation in the process of coal and rock experiencing tectonic stress action in middle low strength. Comprehensive conclusion is that the coalfield structure in the Meicheng-Hanpo'ao area was formed under the condition of multi medium and low intensity and complex tectonic movement dominated by brittle-ductile deformation.