The Research Of Structural Feature In Taerqi, Inner Mongolia

In recent years, there are many research data and results about Greater XinganMountains regional tectonic,but most of these data based on the geophysics andlithogeochemistry;Due to covered serious,the data of region’s structural feature,composition characteristics, structural layer division,stress field recovery is relatively few.The study area is located between Wunuer-Oroqen Fault and Dong Ujimqinbanner-Heihe Fault in Xingan plot which belonged to middle section of Greater XinganMountains.Based on the1:50000regional geological survey, the author took detailed observationand research on the structural features of Taerqi.the results showed that Taerqi area can be divided into five structural layers,respectively are Xingkai structural layer,early Caledonian structural layer,Hercynian structural layer,Yanshanian structural layer and Himalayan structural layer;According to the planar structure, linear structure, combination feature and its dynamics symbol,we restored the local stress field of each structural layer:early Xingkaiperiod was controlled by the NE-SW extrusion (left) shearing action,late by nearly SN extrusion;Early Caledonian period was given priority to with NW-SE extrusion;Hercynianmainly by nearly SN extrusion;Yanshanian was also controlled by nearly SN extrusion; Himalayan show the massive difference lifting movement.