山东淄博太原组有孔虫及石炭系与二叠系界线

The Foraminiferal Fauna of the Taiyuan Formation and the Carboniferous-Permian Boundary in Zibo, Shandong Province

通过对山东省淄博地区太原组小有孔虫类动物群的系统研究,共鉴定出小有孔虫11属22种及部分未定种。根据有孔虫类化石在地层中的分布和垂向变化规律,建立了两个小有孔虫化石组合带:I Bradyina-Plectogyra组合与II TetrataxisNodosaria-Palaeotextularia组合。通过与邻区及华中华北其它地区的有孔虫进行对比,并结合前人对本区类化石的研究结果,确定了各组合带的地质时代:太原组小有孔虫动物群第I组合带地质时代归为晚石炭世,第II组合带地质时代归为早二叠世,其层位相当于山东地区太原组类Pseudoschwagerina带之底。

Through the systematic study of the foraminiferal fauna of the Taiyuan Formation in Zibo, Shandong Province, we haveidentified 11 genera, 22 species, and some undetermined species of small foraminiferal fossils. Based on the spatial distribution andstratigraphic variation in the foraminiferal fauna, two small foraminiferal assemblages are established from the bottom to the top, i.e.,Bradyina-Plectogyra assemblage and Tetrataxis-Nodosaria-Palaeotextularia assemblage. By comparing our fossil data with theforaminiferal fauna in the nearby regions and other areas in Central China and North China, and combining the previous results offusulinid fossils, we have estimated the geological ages of the two fossil zones. The geological age of the Bradyina-Plectogyra assemblage should be Late Carboniferous, and the geological age of the Tetrataxis-Nodosaria-Palaeotextularia assemblage should beEarly Permian. So the Carboniferous-Permian boundary in Shandong Province lies at the bottom of Pseudoschwagerina zone.