Microfacies and Depositional Environment Evolution of the Middle-Upper Triassic Zhuganpo Formation in Zhenfeng, Southwestern Guizhou
详细信息
- 责任者：Wang Jianpo (Wuhan Center of Geological Survey ; Wuhan 430205 ; China) ; Cheng Long
- 刊名：Geological Journal of China Universities
- 出版年：2013
- 卷期：19(3)
- 关键词：沉积微相 ; sedimentary microfacies ; 沉积演化 ; sedimentary evolution ; 贵州 ; Guizhou Province
- 页码：p.513-519
- 图表：4 illus., 16 refs.
- 分类号：0803
- issnNo：ISSN1006-7493
- isbnNo：CN32-1440/P
摘要
Aiming at understanding the Middle-Late Triassic drowning of the Yangtze carbonate platform,this paper analyzes the microfacies of the Middle-Upper Triassic Zhuganpo Formation in Zhenfeng area,Southwestern Guizhou and discusses its depositional environment evolution.Using standard microfacies type methods of Flügel,nine microfacies including laminated bindstone,peloidal packstone,micritic limestone,bioclastic wackestone,encrinite packstone,intraclastic-ooid-bioclastic grainstone,lump-bioclastic wackestone,bioclastic wackestone-pelagic,and micritic limestone-pelagic are recognized.The ordered combination and stratigraphic distribution of these 9 microfacies show that they were formed during the rapid transition from tidal flat to carbonate platform margin environments,and the prolonged deep shelf and basin environments.The analysis of sea-level changes of the Zhuganpo Formation indicates that they were different from the main part of Yangtze Platform,but their third-order cycles and second-order cycles were briefly concordant with global sea-level changes.
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