Evolutionary Mechanism And Geomorphic Responses Of Dangqiong Wrong-Dang Yong Co-Xu Rucuo North-South Neogene-Quaternary Graben In The Northwestern Angren

Dangqiong wrong-Dang yong co-Xu Rucuo North-South Neogene-Quaternary graben is located in the north-west area of Ang Ren,Tibet.The graben is geographically located on the north-west side of Ang Ren County,Shigatse City,Tibet.It belongs to the Gangdese-Lhasa continental block and is located in the Gangdese metallogenic belt,with a north-south trend.The study of the relevant features,evolution mechanisms and processes of the graben is of far-reaching significance for exploring the uplift mechanism of the Tibetan Plateau and the characteristics of the neotectonic movement.The collision between the Indian continental plate and the Eurasian continental plate,and the continuous northward subduction with the Indian plate resulted in the Cenozoic uplift of the Qinghai-Tibet Plateau.Along with the uplift of the Qinghai-Tibet Plateau,a series of garbens with the north-south trend were formed in the plateau Gully.The graben as a carrier of the plateau uplift process records has long been concerned by the geoscience community.Previous studies have focused on issues such as the time limit and mechanism of the formation of the graben,and the differences in the geological records within a single graben,And the recorded spatiotemporal changes are rarely discussed.This thesis takes the longest garben of the Tibetan Plateau whose name is Dang Qiong Cuo-Dang Re Yong Cuo-Xu Ru Cuoto discuss its formation and evolution through early volcanic rock research and genetic landform analysis.Under the influence of tectonic movements with different intensities,the differential evolution in the graben formed the topographical difference between the south and the north.Based on previous research data,combined with previous field investigations,it has been known that the graben was affected by magmatic activity from the mantle during the formation process,and a local tensile stress field was formed in the east-west direction.Under the influence of tension,a series of normal faults with north-south trend and similar tendency are formed,thus forming a series of fault block mountains and fault basins.The interior of the rift basin gradually evolved into a lake sedimentary environment.With the deepening of the influence of the structure and climate,the lake gradually declined and formed a lake embankment ring.By comparing the heights of the three mainlake level,lake embankment ring and ice bucket surface in the graben,the relative elevation difference of the graben in the north-south direction can be clearly found.This article will analyze the geological characteristics of the graben on the basis of the previous field geological survey and the related research data of the predecessors,furtherly analyze the difference between the graben's structural features,sedimentary features and landform features in the north-south direction Evolutionary mechanism and the reasons for this differential evolution.