| 摘要: |
| 比如盆地位于西藏冈底斯-念青唐古拉地体东北部,是在前震旦系变质结晶基底和古生界褶皱基底上发展起来的一个中新生代海相盆地。比如盆地经历了被动边缘盆地演化阶段(T3-J1-2)、复合弧后盆地演化阶段(J2-K1)和高原隆升盆地消亡(K2-Q)三个阶段。本文通过分析盆地内地层及其沉积环境,稀土元素、硅质岩、碎屑模型、火山岩等特征,详细讨论了目前存在争议的被动边缘演化阶段,认为比如盆地存在被动大陆边缘演化阶段,但其沉降期短,没有大陆斜坡沉积。 |
| 关键词: 比如盆地 盆地演化 被动大陆边缘 |
| DOI： |
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| 基金项目: |
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| Tectonic evolution of the Biru Basin in Xizang during the Mesozoic-Cenozoic |
| ZHOU Ya-long, ZHANG Shu-lin |
| (Faculty of Resources, China University of Geosciences, Wuhan 430074, Hubei, China) |
| Abstract: |
| Located in the northeastern part of the Gangdise-Nyainqentanglha block,the Biru Basin as a Mesozoic-Cenozoic marine basin in Xizang was grounded on the pre-Sinian metamorphic-crystalline basement and Palaeozoic folded basement,and has witnessed three stages of evolution,including the passive continental marginal basin during the Late Triassic to the Early-Middle Jurassic;the compound back-arc basin during the Middle Jurassic to the Early Cretaceous,and the basin collapse and plateau uplifting during the Middle Cretaceous to the Quaternary.Compared with the representative passive continental marginal basins,the outer continental shelf deposits and continental slope deposits are absent in the Biru Basin. |
| Key words: Biru Basin basin evolution passive continental margin |
