雪峰山东缘湘中地区控煤构造特征及演化  

Characteristics and Evolution of Coal-controlled Structures on the East Slope of the Xuefengshan Domain in Central Hunan Province

作　　者：李焕同[1] 曹代勇[1] 王林杰[1] 郭爱军[1] 李友飞[1] 徐浩[1] 

机构地区：[1]中国矿业大学煤炭资源与安全开采国家重点实验室,北京100083

出　　处：《大地构造与成矿学》2013年第4期611-621,共11页Geotectonica et Metallogenia

基　　金：国土资源大调查项目“全国煤炭资源潜力评价”(编号:1212011121043)资助

摘　　要：雪峰山东缘湘中地区处于扬子地块与华夏地块的过渡地带,属于雪峰山陆内构造变形体系的一部分。雪峰山构造带的演化导致湘中地区煤田构造变形的时空差异显著,由此决定了煤炭资源赋存的复杂性。龙山串珠状隆起将湘中地区分隔成涟源坳陷和邵阳坳陷。研究区晚古生代煤系经历了多期构造变形,印支-燕山期以来的构造演化进程对煤系赋存起到关键性作用,现今煤田构造格局以多层次、多期次的逆冲推覆构造和滑脱构造为特色,由西向东可划分为三带:西部为逆冲推覆构造带;中部为隔档式褶皱与逆冲断层组合;东部为逆冲断裂与宽缓褶皱带组合。其中,中带向斜较宽缓,煤系保存较连续和完整,深部资源潜力较大;向斜之间的背斜构造紧闭、多与逆冲断层伴生,含煤块段支离破碎;逆冲推覆构造及重力滑动构造的前缘往往造成煤层重复,成为有利的找煤地段。The Xuefengshan domain in the central Hunan is generally considered as a transitional zone between the Yangtze Block and Cathaysia Block and belongs to an intracontinental composite tectonic system. The special geological settings of the Xuefengshan Domain resulted in a significant spatial-temporal differentiation of coalfield structure, which resulted in the complexity of coal resources occurrence. The deformation and distribution of the coal measures in the study area can be divided into two parts： the Baimashan-Longshan clustered uplift zone and the Yuechengling-Guandimiao clustered uplift zone, belonging to the Lianyuan and Shaoyang fold belts, respectively. Structural deformation of coalfield, which controls the tectonic evolution and the lithological associations of coal measures, is characterized by multilevel and multi-phase thrust-napping. Detached structure and gliding nappe developed broadly, and can be divided into three structure belts from west to east： thrust-nappe structure belt, combination of ejective fold and thrust fault, association of thrust fault and open fold. The coal measures of Carboniferous-Permian are well-preserved in the syncline even though experienced successively Indosinian-Yanshanian tectonic deformations. On the contrary, denudation in the anticline area resulted in shallower bury depth of the coalbeds. These decollement structure and nappe structure often led to overlapping of the coalbeds, and thus, is a potential target area for coal resource exploration.

关 键 词：构造演化 控煤构造 雪峰山 湘中地区 

分 类 号：P542[天文地球—构造地质学]