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通过对北川县甘溪泥盆系剖面的实地观测,基于岩性组合特征及古生物学标志,进行了沉积环境分析和层序界面物质组成识别,认为北川县甘溪剖面泥盆系依次发育三角洲、滨岸、浅海陆棚、斜坡、碳酸盐台地5种沉积环境。识别出古风化壳、渣状层、河流回春作用面、古喀斯特作用面、上超及下超面和岩性、岩相转换面6种层序界面物质组成形式。被动大陆边缘拉张伸展活动环境中海平面变化频繁,是其沉积环境多样和层序地层演化复杂的主要原因。
Based on the field observations of the Devonian section of Ganxi in Ganchuan County, the sedimentary environment analysis and the sequence composition of the sequence boundaries were carried out based on the lithologic assemblage characteristics and paleontological signs. The Devonian in the Ganxi section of Beichuan County developed delta, Coastal, shallow sea shelter, slope, carbonate platform five kinds of sedimentary environment. The paleo - weathering crust, slag - like layer, river rejuvenation surface, ancient karst surface, super - super - subsurface superplatform and lithology and lithofacies conversion facies were identified as six kinds of sequence interfaces. The frequent changes of the sea level in the stretching and stretching activities at the passive continental margin are the main reasons for the diverse sedimentary environment and the complicated evolution of the sequence stratigraphy.