震旦纪陡山沱组磷质红藻的发现

根据有关研究文献可知,产出钙质红藻的最老的年代是寒武纪(J.L.Wrag,1977)。笔者报道的这些磷质红藻发现在华南陡山沱组的磷块岩矿层中。有的磷块岩含这种磷质红藻达50%以上,局部可以单独构成藻磷块岩。磷质红藻产出的地点有贵州瓮安的英坪、大塘、开阳,湖北荆襄的大峪口,宜昌的桃坪河,湖南石门杨家坪、江西上饶朝阳,陕西汉中天台山和勉县茶店等地。层位上的分布特点是,比较集中地出现在陡山沱组上部或顶部的主要矿层中。

THE DISCOVERY OF PHOSPHATIC RED ALGAE IN THE SINIAN DOUSHANTUO FORMATION

The phosphatic red algae were discovered in the phosphorites of Sinian Doushantuo Formation in South China. The follwing are places where the red algae occur: Yichang and Jingmen-Xianyang region in Hubei province, Shimen in Hunan Province, Kaiyang and Wengan in Guizhou Province, Hanzhong and Mianxian in Shanxi Province, Shangrao in Jiangxi Province, and so on. The red algae belong to different families or genus, but most of them belong to Solenopora in Solenoporacae. The thallus of the red algal has the forms of nodule, column or complex coagulum. The thallus is composed of radial trichomes. The mineral component making up the cell wall is micri-tic apatite. The inside of the cell is frequently polluted by organic substances. The discovery of the phosphatic red algae is of great significance to paleontology, stratigraphy and phosphorite mineralogy.