青州地区早奥陶纪碳酸盐岩微相分析及沉积环境研究

山东青州尧王山剖面晚寒武世—早奥陶世地层发育齐全,在对该剖面下奥陶统实测基础上,结合详细的薄片分析,对其颗粒成分、生物组合、基质类型及结构特征等进行深入研究,将剖面下奥陶统碳酸盐岩划分为9种微相类型,即微生物岩砾屑灰岩微相、无纹层似球粒颗粒灰岩和灰泥质颗粒灰岩微相、砂屑与砾屑灰岩微相、包含有完整生物碎片的颗粒质灰泥灰岩微相、具有被包壳和被磨蚀骨屑颗粒的生屑灰泥灰岩微相、含亮晶胶结物的被包壳的生屑颗粒灰岩微相、贝壳富集灰岩微相、海绵骨针粒灰泥灰岩微相以及灰泥灰岩微相。依据各微相特征,结合野外宏观特征将尧王山剖面划分为3种沉积环境类型,即台内浅滩、局限台地及开阔台地。

Early-Ordovician Carbonate Microfacies and Sedimentary Environment in Qingzhou Area

The late Cambrian to Early-Ordovieian strata of Qingzhou Yaowangshan section in Shandong province is completely developed. Based on the survey of the outcrop of Early Ordovician,this paper made further research on the particle composition, biological combination, the matrix types and structural characteristics. The discussed region was found to present nine types of microfacies：microbial carbonate breccia, no pattern layer peloidal grainstone and the marl grainstone, calcarenites grainstone and carbonate breccia, particle marl which contains complete biological debris, the bioclastic limestone plaster with enclosed shell and ablation of bone particles, the enclosed shell of bioclas- tic limestone that include sparry calcite cement, shelllimestone, sponge spicules wackestone, and marlstone. According to the characteristics ot- microfaeies and field macroscopic,three types of sedimentary environment were summarized in the following： the inner platform shoals, the restricted platform and the open platform.