| 摘要: |
| 位于西藏冈底斯带的甲马弧内盆地是随着甲马岛弧的发育而产生的,沉积了一套滨浅海相活动大陆边缘的沉积物,主要由碎屑岩与海绵礁灰岩构成。在盆地内的上侏罗统至白垩系中,共识别出七个3级层序,包括1个Ⅰ类层序和6个Ⅱ类层序。重新建立了该区层序地层年代格架。层序地层的研究表明,盆地的演化可划分为具深切谷的碎屑陆架阶段,碳酸盐台地与海绵礁形成阶段,滞流的碎屑陆架阶段,无障壁海岸的碎屑陆架阶段和具障壁海岸的碎屑陆架5个阶段。 |
| 关键词: 盆地演化 层序地层 弧内盆地 西藏甲马 |
| DOI： |
| 附件 |
| 投稿时间：2000-03-30 |
| 基金项目: |
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| The formation and evolution of the Jiama intra-arc basin in Xizang |
| PENG Yong-min, YAO Peng, LI Jin-gao |
(1. Chengdu Institute of Geology and Mineral Resources, Chengdu 610082, Sichuan, China;
2. Xizang Bureau of Geology and Mineral Resources, Lhasa 850000, Xizang) |
| Abstract: |
| The Jiama intra-arc basin located in the Gang dise tectonic belt, Xizang was formed with the development of the Jiama island arc, where there occurs a succession of littoral and shallow-marine active marginal sediments consisting of clasticrocks and sponge-reef limestones. The Upper Jurassic and Cretaceous strata in the basin may be grouped into seven third-o rder sequences including one type 1 sequence and six type 2 sequences.The stratigraphic framework has been reconstructed for the basin.The study of sequence stratigraphy indicates that the basin has experienced five stages of evolution:(1) deeply incised siliciclastic shelf;(2) carbonate platform and sponge reefs;(3) stagnant siliciclastic shelf; (4) non-barrier siliciclastic shelf, and (5) barrier siliciclastic shelf. |
| Key words: basin evolution sequence stra tigr aphy intra-arc basin Jiama in Xizang |
