中蒙边界中西段地层划分与对比

The division and correlation of strata in the mid-western part of Sino-Mongolian border area

中国与蒙古交界地区,早前寒武系—新生界分布广泛,地层划分系统差别较大。以区域岩石地层组合及构造演化特征为背景研究认为,从新疆阿尔泰段至蒙古戈壁-天山段,地层具有连续性,可统一划分对比;并以额尔齐斯-布尔根断裂、喀拉麦里断裂、Borzon断裂及东蒙古-迭布斯格断裂为界,由西向东将中蒙边界中西段地层划分为阿尔泰地层分区、准噶尔-戈壁阿尔泰地层分区和北山-戈壁天山地层分区,并对区内地层单元进行了统一划分与对比。

In the Sino-Mongolian border area,the Early Precambrian-Cenozoic strata are widely distributed but assigned to different stratigraphic classification systems. On the basis of lithostratigraphy and tectonic evolution,the authors hold that,from Altay of China to Gobi-Tianshan of Mongolia,the strata are continuous and can be divided in unified way. With the Ertysh-Burgen fracture,Karamic fracture,Borzon fracture and East Mongolia-Diebusigo fracture as the boundary,the strata in mid-western border area can be divided into three parts,i.e.,Altay zone,Junggar-Gobi Altay zone and Beishan-Gobi Tianshan zone. In this paper,the unified division and correlation of strata in this area were carried out.