Geometric And Kinematic Characteristics Of Wangfeng Horst-shape Fault Belt In Xishan Coalfield Of Taiyuan

Xishan coalfield of Taiyuan is one of the six coalfields in Shanxi province, has a very important role in the supply of coal resources in Taiyuan City and the surrounding urban areas, mainly mined Carboniferous and Permian coal seams, coalfield is located in the western side of Taiyuan basin and eastern foot of Luliang mountain, Yanshanian intrusive monzonite rock exposed in southwest of Coalfield, the overall structural shape is a west wing steep, east wing gently dipping syncline. the complexity of geometry affects the development and utilization of coal and production safety.In recent decades, Geological work get a lot of detailed information of Xishan coalfield of Taiyuan, the scholars have concluded structural features. But related to the study of the structure morphology,kinematics are still many gaps in knowledge. Beneath coalfield are the Ordovician and Cambrian sedimentary strata. Groundwater makes carbonate karst development, Karst collapse column is surface evidence of active groundwater. Meanwhile, the collapse column internal reserves a large number of geological information, has important significance for the analysis of the structure, topography, and discipline of groundwater movement, the previous geological work is often ignored outcropped karst collapse column.Select eastern part of Wangfeng fault belt and surrounding area about50Km2as the research object, combined with a large number of field geological outcrops, observe morphological characteristics from multi-angle, and use the principles of geology coupling to analyze the geometry and kinematic characteristics of the geological body. Discuss the relationship of structure and groundwater based on the the surface Collapse Column the space distribution characteristics.The results show Shortening deformation in geological body nearly EW direction, The overall embodied in three irregular folds deformation, Fold shapes have been superimposed and reformed by NNE trending faults, the research object are nearly NS large-scale extensional deformation, composed by a series of NNE trending normal faults, This morphological characteristics makes the whole study area as crushing fault block.predecessors mentioned Wangfeng-Suilaomu fault belt can extend only to eastern side of Huangchang channel, not to the interior of Taiyuan basin. NEE trending normal faults have the phenomenon of conversion, division, slippage and associated folds, make geological morphology complicated. Karst collapse columns occurred in strong deformation of NEE trending fault boundary, Analysis of Collapse Columns occurred after the fault, It is an important evidence of water conducted by geological structure. Based on the geometry characteristics and faults Truncated relationship to explore the kinematics of this area, establish relative event-time series of structure, Studies suggest that the deformation of the EW undulating folds is the first phase of structure, extrusion stress is the major stress, then, NEE-trending normal faults formed, reflecting the characteristics of large-scale nearly NS extensional deformation, This brittle fracture superimposed on the first phase of structure, The geological bodies as a whole crushing separation, make the whole study area separating,formed fault blocks, provide a good structure for the movement of groundwater, a large number of karst collapse columns developed, the last, Taiyuan basin began to rift, edge hill first-order fault blocked by NEE-trending faults.