Geometrical And Dynamical Analysis Of Duerping Horst-shape Fault Belt In Xishan Coal Field Of Taiyuan

The TaiYuan Xi'shan coal field land block is in northwest QinShui coal field, is the important Coal mining area in ShanXi province. As a whole , the coal field is an east wing delaying, west wing steep dipping syncline .At the final stage of Mesozoic Era, the intense Yanshan tectonic movement enabled the North China Craton crystalline basement to have the breakage and disintegration. The interior of TaiYuan XiShan coal field received the intense destruction from intrusive bodies in Yanshan time. For this reason, the coal field formed complex conformation, such as five group of parallel horst fault belt along northeast.However, the geometry, the kinematics, dynamics, the chronology, the growth evolutionary process, as well as the relations between dense distributed breaks and other subjects related to Taiyuan Xishan coal field interior horst fault belt nobody has made a thorough analysis yet. This limited depth cognition to this area about the tectonic stress field and tectonic evolution process. In this paper, the investigated object is DuerPing fault belt, the one of five group of horst fault belts in TaiYuan XiShan coal field. Aiming at configurating the three-dimensional geometry of the DuerPing fault belt, the author undertook a field investigation in a well-outcropped area of about 40Km2. Then based on the 3D body-balance principle, the direction and amount of displacement and rotation of the faulted blocks in this belt were analyzed; by means of the coupling geology principle, the fault deformation, the rock invasion and many other kinds of process's coupling linkaged relations were analyzed; the event - time - space sequence relations were built. The findings will be helpful in revealing the evolution of Shanxi mantle upwelling belt and the lithosphere thinning belt, understanding the North China Craton's destruction process, preventing geological disaster because of fault activity as well as optimizing layout on coal mine working face.The collapse column is one kind of special hidden geology phenomenon, it is widespread developed in the coal measures stratum of Taiyuan Xishan coal field, it has the very tremendous influence on coal mining. One primary cause of forming collapse column is the karstic water intense corrosive nature, the ground water rich place often is the collapse column growth place. Underlying bedrock's crevasse which connects with the surface faulting is the ground water ideal migration path. The surface fault belt is also the important supplies channel for ground water.Therefore, Clarifies developmental mechanism of crushed belt which produces by the surface fault structure, can know the ground water migration rule, this rule have important meaning to further discusses on spatial distribution character of hidden collapse column in underlying coal measures stratum. The findings indicated that Duerping horst fault belt is composed of northeast and north north-west two groups of fault belts. And northeast trending fault belt is a step horst, the Forming reason is because deep mantle rock magma upwelling caused the extensional faulting on surface brittle strata, then under the action of gravity, different blocks had the unequal settlement and finally formed horst structure.The north north-west trending fault belt was influenced by the forming process on marginal fault belt at the east of research area. Hanging layer in basin produced drag force when it decreased, the original north north-west trending layer broken into land blocks and moved out of their place in order to balance this kind of drag force. Thus the fault terrace belt formed.