The Sub-surface Structural Character And Evolution Mechanism Of Micang Mountain-Zhenba Zone

Michangshan-Zhenba located in the northeastern part of Sichuan province, it isbounded on the north by the Qinling orogenic, on the east by the Daba Shanfold-thrust belt, and onthe northwest by the Longmen Shan fold-thrust belt, Becauseof its special tectonic location and become one of hot areas for the study of theSuperimposed structure relationship and the basin-mountain coupling relationship.In this paper, on the basis of predecessors’ research, characteristics of sub-surfacestructure in the region has carried on the detailed analysis, The main conelusions areas follows:(1) from the orogenic belts and foreland basins, Michangshan fold-thrust belt canbe divided into basal thrust nappe belt, southern margin thrust belt, forelandmonoclinal zone, and foreland fold belt, and summarizes the tectonic style of eachbelt;(2) Zhenba from northeast to southwest region can be divided into thrust and foldbelt, foreland thrust and fold belt, Wide flat fold belt,and summarizes the tectonicstyle of each belt;(3) By the southern front of the Micangsha and Zhenba of five balanced section,according to the layers of Shorten the rate, the area is divided into two verticaltectonic deformation on the level of regional control of the upper and lower layers areslipping deformed layer major factors controlling structural styles;(4) By Balanced section through the shortening rate calculated, in the southernfront of the Micangsha, the western of Shortening rate than the eastern and Tectonicdeformation also strongly, Zhenba eastern region of strong structure deformation thanthe western.