鄂西黄陵背斜周缘埃迪卡拉纪灯影组地层序列及其区域地层对比意义

Stratigraphic Sequence of the Ediacaran Dengying Formation around the Huangling Anticline,Western Hubei Provence:Implications for Regional Stratigraphic Correlation

华南峡东地区埃迪卡拉纪灯影组保存了大量埃迪卡拉纪宏体生物化石,是研究寒武纪大爆发之前生命演化的热点地层单元之一.峡东灯影组一般划分为3段,然而灯影组在黄陵背斜周缘不同位置的厚度、岩性等方面具有差异性,使得峡东地区灯影组的地层对比关系还有待于进一步研究.围绕鄂西黄陵背斜周缘灯影组进行对比研究,以岩石地层序列为基础,厘定不同区域灯影组的地层序列.将黄陵背斜周缘灯影组地层总结归纳出7种类型并建立各岩石地层单元之间的联系.从而揭示灯影组的区域性变化,进而为埃迪卡拉纪晚期环境和生物演化研究提供地层对比方面的重要支撑.

The Ediacaran Dengying Formation inthe Yangtze Gorges area contains many well-preserved macrofossils,one of the most intensively studied Ediacaran units before the Cambrian Explosion.The Dengying Formation in the Yangtze Gorges area canbe generally subdivided into three lithostratigraphic members.However,the thickness and lithology of the Dengying Formation at different locations around the HuanglingAnticline are different.The stratigraphic correlation of the Dengying Formation in the Yangtze Gorges area needs further study.In this paper,a comparative study was carried out around the HuanglingAnticline in western Hubei Province.The stratigraphic sequence of the Dengying Formation is proposed to be categorized into seven types based on lithostratigraphic features.Moreover,the relationship between each lithostratigraphic unit in the Denying Formation is summarized.Consequently,the research will bebeneficialto the regional correlation of the Dengying Formation,and help unveil environmental and biotic evolutions in the late Ediacaran period.