The formation and evolution of the Jiama intra-arc basin in Xizang
-
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。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.
-
Keywords:
- basin evolution /
- sequence stra tigr aphy /
- intra-arc basin /
- Jiama in Xizang
-
计量
- 文章访问数: 96
- HTML全文浏览量: 6
- PDF下载量: 109
下载:
