滇东下寒武统磷块岩中发现大量磷质藻类化石。沉积学和扫描电镜研究表明磷块岩中所有颗粒由磷质菌藻类包绕,它们可能由富磷的菌藻类周期性死亡后蚀变形成。生物和生物化学作用形成了原生藻磷块岩;机械分选和次生淋积作用可使原生藻磷块岩进一步富集。根据 A large number of phosphorous algae fossils were found in the Lower Cambrian phosphorites in Eastern Yunnan. Sedimentology and SEM studies show that all the particles in the phosphorite are surrounded by phosphorus-containing algae, which may be formed by cyclic death of phosphorus-rich bacteria and algae. The biological and biochemical actions formed the native algal phosphorite; mechanical separation and secondary lacustrine enrichment of the native algal phosphorite. according to