湘中涟源地区褶皱-断裂构造控煤特征及成因机制

Coal-controlled characteristics and mechanism of fold-fault structure in Lianyuan Area of central Hunan Province

为研究湘中涟源地区煤系多期次、多层次区域性顺层滑动断层、构造控煤特征及其成因机制,采用现代地质学和构造解析的理论和方法,结合野外地质剖面、勘探线剖面及岩石力学参数等资料,提出了有利的含煤地段。结果表明:在各矿区表现为缺失性滑覆断裂,大部分地段沿测水组煤层顶段滑动,有时斜切地层,断层产状与地层产状一致,倾角在地表浅处较陡,向深部变缓;由于顺层滑动断层多发育在煤层的顶部,对煤层赋存有利,使煤层埋藏变浅,在老矿区外围有利于找煤;构造演化背景、多层次滑脱层的控制作用、煤系上覆和下伏岩性组合差异性及深部构造及基底属性对浅部构造的控制等因素共同作用决定了涟源地区构造变形特征。

To study multi-phase, multi-layered regional sliding structures ,the characteristics and mechanism of structure coal-controlled ac- tion of Lianyuan Area in central Hunan Province by adopting the theories and methods of modern geology and structural analysis, and com- bined with the field strata cress-section,prospecting line and rock mechanics parameters,the favorable areas of coal were proposed.The re- suits show that the detached sliding fault develops in all mine areas, and most of these faults slide along the top of the Ceshui Formation coal, sometimes they bevel the strata,fault attitude is in accordance with stratigraphic attitude,the inclined angle of detached fault is steep in the shallow buried depth of surface,and become gentle in deeper layer.Detached faults are mainly devdoped at the top of coal seam,which are fa- vorable to the save of coal resources occurrence, and make the buried depth of coal bed become shallower ;it is favorable to search for coal in the periphery of the old mining area.Mutiple factors ,including the evolution background of structures ,the control action of multi-layered de- tachment layers,differences of lithological association exist between overlying strata and underlying strata, and the controlling of deep struc- ture and basement property on shallow structures,etc,have determined the deformation characteristics of strcture in Lianyuan Area.