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

摘要: 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。

Abstract: 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 di-vision and correlation of strata in this area were carried out.