摘要
对羌塘中央隆起区的物质成分及构造演化规律的认识 ,涉及到青藏高原特提斯演化、羌塘盆地的形成发展及高原的隆升过程。对羌塘中央隆起区构造演化在认识上目前有较大分歧 ,主要有两种观点 :1)认为扎布 (察布 )—查桑地区发育裂谷 ,没有发育成特提斯洋盆 ;2 )龙木错—双湖 (—澜沧江 )古特提斯缝合带 ,代表古特提斯洋的闭合遗迹之一。基于对羌塘中央隆起区物质成分及属性 ,以及同位素年代学研究 ,将羌塘中央隆起中泥盆世—早白垩世的构造发展历史划分了六个阶段 ,即D2 —C11初始裂谷阶段 ;C21—C2 裂谷阶段 ;P1海底扩张—大洋化阶段 ;P2 —T2 板块汇聚—消减阶段 ;T3 —J1板块碰撞阶段 ;J2 —K1碰撞—整体抬升阶段。
The knowledge of the material composition and tectonic evolution of Qiangtang central uplift region connect with the under-standing of Tethys evolution of Qingzang plateau, the formation and development of Qiangtang basin as well as the rising process of the plateau. The opinion the evolution of Qiangtang uplift region is still divided: 1)Rift volley in Zhabu(Chabu)-Chasang didn’t develop into Tethys marine basin, or 2) The Longmucuo-Shuanghu(-Lancangjiang) Paleo-Tethys suture zone is one of the relics of the closed boundary of Tethys ocean. According to the study of the material constituent and its property as well as isotopic chronology of Qiangtang uplift region, six stages of the tectonic development of Qiangtang central uplift region in the period of Middle Devonian to Early Cretaceous are recognized: (1)the initial rift stage(D 2-C 1), (2)the rift stage(C 1-C 2), (3)the sea-floor spreading-oceanization stage(P 1), (4)the subduction stage(P 2-T 2), T 3-J 1 the plate convergence-cousuming stage and J 2-K 1 the collision-overall rising stage respectively. So the tectonic evolution of Qiangtang central uplift region experienced a process of entire Wilson cycle.
出处
《长春科技大学学报》
CAS
CSCD
北大核心
2001年第1期25-31.3,共7页
Journal of Changchun University of Science and Technology
基金
原地矿部"九五"重大基础资助项目!( 95 0 110 1- 0 5 )
中国石油天然气集团公司"九五"科技工程资助项目!(QZ- 97- 2 0 410 2 )
关键词
西藏
羌塘中央隆起
物质组成
同位素年代学
构造演化
Tibet
Qiangtang central uplift region
material composition
isotopic evolution
tectonic evolution
