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首次在安徽宿松地区中二叠统中发现古代上升流沉积典型实例。通过对上升流层序岩相的分析,将研究区上升流岩相划分为硅质团块、硅质条带、硅质细层、硅质结核、硅质岩、硅质泥岩和泥晶灰岩7种类型,并发现发育有上升流沉积典型层理——微细层理;根据不同上升流沉积层序中岩相的有规律的组合特征,将其岩相组合划分为2种类型,即陆棚缓坡相和陆棚盆地相组合;分析了上升流对生物古生态特征的控制作用,认为上升流的发育强度和生物群落的丰度成正相关,而与分异度多成负相关。
For the first time, typical examples of sedimentation in the upwelling of ancient China were found in the Middle Permian in Susong area, Anhui Province. Based on the analysis of upwelling lithofacies facies, the upwelling lithofacies in the study area are divided into siliceous, siliceous, siliceous, siliceous nodules, chert, siliceous mudstone, According to the regular assemblage characteristics of lithofacies in different upwelling sedimentary sequences, the lithofacies assemblages are divided into two types, that is, Continental slope facies and continental shelf basins. The control effect of upwelling on the paleoenvironmental features is analyzed. It is concluded that the upwelling intensity is positively correlated with the abundance of biota, but negatively correlated with the degree of diversity.