Sedimentary Characteristics and Geological Significance of Paleogene Niubao Formation, Southern Nyima Basin
详细信息
- 责任者：Wu Jinglong (Institute of Sedimentary Geology ; Chengdu University of Technology ; Chengdu 610059 ; China) ; Zhu Lidong
- 刊名：Geology and Mineral Resources of South China
- 出版年：2011
- 卷期：27(1)
- 关键词：古近纪 ; Paleogene ; 沉积相 ; sedimentary facies ; 西藏 ; Tibet
- 页码：p.59-63
- 图表：2 illus., 15 refs.
- 分类号：0803
- issnNo：ISSN1007-3701
- isbnNo：CN42-1417/P
摘要
According to the lithology, structure and color of sediments, the fan delta facies can be subdivided into fan delta plain subfacies (including braided channel macro-facies and riverway inter-bay macro-facies), fan delta front subfacies (including underwater distributary channel macro-facies and distributary inter-bay macro-facies), and pre-fan delta subfacies;while the lacustrine facies can be subdivided into shore lake subfacies, shallow lake subfacies and semi-deep (or deep) lake subfacies. The finding of ripple index and stripping lineation of sandstones in fan delta front subfacies indicated that the sediments of Niubao Formation of Chaangba section come from the Gaize-Selingcuo thrust block, southern Nyima Basin. The sedimentary cycle subdivision of the Paleogene Niubao Formation at Chagangba area has great significance for the research of uplift mechanism, palaeogeograhpic reconstruction and oil exploration of Qinghai-Tibetan Plateau.
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