摘要
通过对永宁组沉积序列、沉积特征、沉积环境等研究认为永宁盆地基本保持了原始面貌，为一东高西低的箕形盆地，物源分别由东西侧注入。永宁组沉积前，辽东古陆可能还存在同辽西杨庄组、雾迷山组相当的层位。永宁组主要为河流－冲积扇沉积体系，其中又包含有泥石流、颗粒流、片流、主河道、分枝河道等相体。永宁组是多个扇体相叠加而成的产物。
Through studies on sedimentary characteristics on sedimentary sequence,environment, it is considered that Yongning basin is basically kept original, which was an east high and west low dust pan basin and its provenance material came from east and west. Before Yongning Formation sedimented on Liaodong palaeocontinent,there existed a stratum corresponding to Yangzhuang and Wumishan Fs.in West Liaoning. Yongning F. mainly is a river alluvial fan sedimentary system which includes mud rock flow, grain flow, sheet flow, main stream channel, and branching stream channel facies. That is to say, Yongning F. is the superimposed product of multiple fan shaped facies. Each large scale conglomerate layer represents a large scale flood event.
关键词
永宁盆地
永宁组
箕形盆地
冲积扇
沉积特征
Yongning basin, Yongning Formation, Dust pan basin, Alluvial fan
