摘要
青藏高原形成至今经历了4个互有叠接的构造期。α期以南北缩短和向北推移为主,主要发生在45～35 Ma期间,β期表现为长周期缓慢隆升,在35～5.3 Ma期间占主导地位;γ期为短周期快速隆升阶段,自5.3Ma开始,3.0 Ma以后逐渐达到高峰;δ期以东西向伸展变形为特征,3.0 Ma以前出现在喜马拉雅地区,3.0 Ma以后遍及整个高原.第四纪以后表现为占主导地位的变形运动形式。根据γ期和δ期构造变动在空间和时间上的不均匀性,把青藏高原划分为西藏、羌塘和柴达木3个构造域。
The formation of the Qinghai-Tibet plateau has progressed through four partly overlapped tectonic episodes. The a episode mainly witnessed NS shortening and northward movement in 45 ~35 Ma. This was followed by a long period of slow uplift, i. e. ,the (3 episode,from 35 to 5. 3 Ma. The 7 episode was a short period of rapid uplift that started 5. 3 Ma ago and reached its culmination after 3. 0 Ma. The 6 episode was characterized by E-W extension. It occurred before 3. 0 Ma B P in the Himalaya area and spread to the whole plateau after 3. 0 Ma B P. Extension became a dominant mode of deformation movement in the Quaternary. On the basis of the inhomo-geneity of tectonic deformation in space and time in the γ and δepisodes,the Qinghai-Tibet is divided into three tectonic domains,Tibet ,Qingtang and Qaidam.
出处
《地质学报》
EI
CAS
CSCD
北大核心
1998年第3期211-227,共17页
Acta Geologica Sinica
基金
国家攀登计划"现代地壳运动和地球动力学研究"
国家自然科学基金(编号49672155
关键词
青藏高原
变形运动学
位移速率
新构造区
Qinghan-Tibet plateau
deformational movement
displacement rate
neotectonic domain
