西藏措勤盆地构造特征与地壳缩短

基金项目:

国土资源部"青藏高原油气资源战略选区调查与评价"项目

国家自然科学基金项目(40672086)

Tectonic division and crustal shortening in the Coqen Basin,Xizang

1. Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu 610059, Sichuan, China;
2. Centre for Qinghai-Xizang Plateau Geology, China University of Geosciences, Beijing, Beijing 100083, China

摘要: 措勤盆地为青藏高原仅次于羌塘盆地的第二大海相盆地,笔者通过对盆地基底和盖层变形特征分析,将措勤盆地基底划分为北部拗陷、北部隆起、中部拗陷和南部隆起4个一级构造单元;盖层划分为北部拗褶带、北部冲断带、中部拗褶带、南部冲断带和南部拗褶带5个一级构造单元,并利用平衡剖面计算得到措勤盆地晚白垩世缩短约24%。
- 措勤盆地 /
- 拗陷 /
- 盖层 /
- 地壳缩短 /
- 西藏
Abstract: The Coqen Basin,Xizang is the second large-scale marine basin only smaller than the Qiangtang Basin on the Qinghai-Xizang Plateau.Tectonically,the basement of the Coqen Basin may be divided into four first-order tectonic units,i.e.,northern depression,northern uplift,central depression and southern uplift,while the cover may be separated into five first-order tectonic units,i.e.,northern downwarped zone,northern thrust fault zone,central downwarped zone,southern thrust fault zone and southern downwarped zone.The shortening rates during the Late Cretaceous are estimated at about 24% on the basis of the balanced cross-section calculations.
- Coqen Basin /
- depression /
- cover /
- crustal shortening /
- Xizang