山西省王莽岭景区大型滑塌构造成因机制

Analysis on the genesis mechanism of large-scale slip structure in Wangmangling scenic area of Shanxi province

滑塌构造又称滑陷构造,是指已沉积的沉积层在重力作用下发生运动和位移时所产生的各种同生变形构造的总称。其触发因素多种多样,研究滑塌构造有助于了解沉积历史和古地理特征。本文对山西省王莽岭国家地质公园景区内发育于寒武系与奥陶系之间的大型滑塌构造的下伏层、滑塌体和上覆层所具有的构造与沉积几何特征进行综合研究分析,并通过滑塌构造体典型剖面中碎屑流的厚度分布、泥砾含量对比、流向指示等运动特征研究,再结合震积滑塌体伴生褶皱的规律,表明王莽岭景区大型滑塌构造的成因为地震诱发所致,且震积滑塌体的滑塌方向为自北东向南西。此次研究分析成果提高了景区地质科学内涵,同时对我国境内的震积滑塌体的构造体系研究也具有重要的科学借鉴意义。

Slip structure,also known as sliding structure,refers to all kinds of syngenetic deformation structures produced by the movement and displacement of sediments under the action of gravity.The triggering factors are various,and studying the slump structure is helpful to understand the sedimentary history and palaeogeographic characteristics.In this paper,the tectonic and sedimentary geometric characteristics of the underlying strata,landslides and overlying strata of large-scale landslides developed between Cambrian and Ordovician in Wangmangling National Geopark Scenic Area of Shanxi Province are comprehensively studied and analyzed,and the movement characteristics of clastic flow in typical sections of landslides,such as the thickness distribution of clastic flow,the contrast of debris content and the indication of flow direction are also studied.The results show that the cause of the large-scale collapse structure in Wangmangling scenic area is caused by earthquake,and the direction of the collapse of the seismic collapse body is from NE to SW.The research and analysis results have improved the connotation of Geological Science in scenic spots,and have important scientific reference significance for the study of tectonic system of seismogenic landslides in China.