苏皖地区孤峰组放射虫动物群及其古环境意义

Studies on Radiolarian Fauna from Gufeng Formation in Anhui and Jiangsu Provinces,East China and Its Paleoenviromental Significance

苏皖地区下二叠统孤峰组4条剖面中含有极其丰富的放射虫化石，经鉴定计9属27种.它们主要由阿尔拜虫类albaillellids，球形多囊虫类sphericalpolycystine和十字多囊虫类stauraxonpoly-cystine组成，并且可以划分成3个组合带，即Pseudoalbaillellafusiformis-Plongtanensis，FOlli-cucullusmonacanthus和Ruzhencevispongusuralicus-FOllicucullusscholasticus组合带.同时根据这3个组合带化石的分布，进行了这4条剖面的地层对比，并与国内外时代大致相当的放射虫组合带进行了比较，还讨论了这3个组合带的时代另外，还根据放射虫岩的结构构造特征、生物组合特征及古地磁料。

Recently, diverse, abundant and well-preserved radiolarians have been discovered from the radiolarites of the four sections of the Gufeng formation(Lower Permian) in Anhui and Jiangsu Provinces, among which nine genera and twenty seven species are recognized. These radiolarians are composed of three basic types of microfossils, namely, the albaillellids, the spherical polycystine and the stauraxon polycystine- Based on the distribution pattern of the radiolarians in the Gufeng Formation, they are divided into three assemblage zones, namely, the Pseudoalbaillella fusoformis - P. longtanesis Assemblage Zone in the lower part, the Follicucullus monacanthus Assemblage Zone in the middle part and the RuzhencevisPongus uralicus-Follicucullus scholasticus Assemblage Zone in the uper part. At the same time, according to the appearance of the three assemblage zones, the four sections of the Gufeng Formation are correlated by them, and they are still correlated with the assemblage zones of the same age from Guangxi and Yunnan of China, Southern Japan and North America. Finally, the ages of the three assemblage zones are discussed, corresponding to Maokouan and Guadalupian stage. In addition, judging from the features of radiolarites, faunal assemblages, geochemistry and paleomagnetic material, the radiolarites in the area might be formed by the effect of the upwelling.