滇东地区早寒武世磷块岩的藻类化石

滇东早寒武世磷块岩薄片中发现大量藻类化石。本文所讨论的磷质藻类化石主要有:球状藻类、丝状藻类、疑源类、叠层石类、核形石类和花纹石类(凝块石类)等27个属种(或型),它们构成各种颗粒磷块岩、叠层石磷块岩、藻丘磷块岩,是磷块岩富矿的主要组分,P_2O_5可达30—37％。这些多门类的藻类化石,为生物成磷作用和成矿环境提供了主要依据,也为震旦—寒武系界线划分提供了新的资料。

PHOSPHATIC FOSSIL ALGAE FROM PHOSPHORITE DEPOSITS IN EASTERN YUNNAN

A big variety of fossil algae has been observed in thin sections of the Early Cambrian phosphorite in Eastern Yunnan. The main phosphoric fossil algae described here are: Spheroidal types: Pandorinopsis sp., Tetraphycus sp., Clonophycus sp., Myxococcoides sp., Eozygion sp., Eoentophsalis sp.. Filamentous types: Palaeolyngbya sp., Eomycetopsis sp., Rhicnonema sp., Proaul opora sp., Solenopora sp.,Epiphyton sp.,Girvanella sp..Acritarcha: Dictyosphaera sp.,Trachysphaeridium sp., Zonosphaeridium sp., Lignum nematoidea. Stromatolites: Scyphus f., Microstylus f., Cryptozoon f.. Oncolites: Osagia f., Asterosphaeroides f., Radiosus f., Pilisphaeroides f.. Catagraphia: Vesicularites f., Glebosites f., Vermiculites f..These fossil algae roughly represent the important elements of the Zhongyicun assemblage and provide data for correlation of Sinian-Cambrian System.They are also important for understanding the phosphogenic environment and processes.