中文摘要：

报道了湖北宜昌纽芬兰统岩家河组中的硅磷质结核。X-衍射分析表明结核内部磷质含量较高,而外部硅质含量较高。镜下研究发现其内部常呈疏松状,且富含小壳化石和蓝菌类化石,表明在结核的形成过程中,小壳化石和蓝菌类化石起着十分重要的作用。硅磷质结核的生长是在微生物调节下随介质物理化学条件的变化而逐步进行的。

英文摘要：

This paper reports siliceous-phosphatic nodules from the Yanjiahe Formation,Terreneuvian in Three Gores area,Hubei province,South China.The results of XRD show phosphatic contents are higher in interior and siliceous contents are higher in exterior of the nodules.The nodules＇ interior shows loose texture,and abundant Cyanobacteria and diverse Small Shelly Fossils are found in siliceous-phosphatic nodules.It indicates Cyanobacteria and SSFs play an important part in formation process of nodules.Under the regulating action of microorganisms,siliceous-phosphatic nodules were formed gradually along with the mediums＇ change of physic-chemical condition.