内蒙古大梁道班地区叠加褶皱构造分析

内蒙古大梁道班地区位于二连-贺根山缝合带和西拉木伦断裂带之间,区内广泛发育大面积浅变质岩和火山岩。该地区横跨叠加褶皱较为典型,通过1:5万区域地质调查和研究横跨叠加褶皱的几何学、运动学特征,并对其形态、组合关系以及产状要素等进行半定量分析,大量统计与不同期次褶皱相配置的线理和面理数据,利用赤平投影,厘定出本区的三期叠加褶皱变形,同时建立本区的构造变形序列。认为第一期褶皱以区域规模的大型紧闭平卧褶皱为特征;第二期褶皱是在第一期褶皱的基础上发生的横跨叠加褶皱;第三期褶皱是以第二期褶皱轴面劈理和面理在走向上的蛇形弯曲为标志形成的宽缓直立褶皱。

ANALYSIS SUPERIMPOSED FOLD STRUCTURE IN DALIANGDAOBAN REGION OF INNER MONGOLIA

Daliangdaoban in Inner Mongolia is located between Erlian-Hengenshan suture zone and Xilamulun fault. In the region, the development of large-area wide shallow metamorphic and volcanic rock, where across superposed fold is very typical. Author carry on 1:50000 regional geological survey and structural analysis, focusing on geometry and kinematics feature of cross superimposed fold, and makes a semi-quantitative analysis of its morphological feature, composition relationship and attitude. Statistics lots of different stages of lineation and foliation date, using stereographic projection to analyze. Three stages of fold structural deformation are established is considered that the first fold is large closed recumbent fold in regional scale, the second fold is cross superposed fold based on the first fold, the third fold is wide and upright fold is marked by hugger and foliation of the second fold arises serpentine bend.