Abstract: The late Sinian and early Cambrian are two most important age of phosphate formation in the west Yangtze area. Phosphate deposits are distributed along the margin, platform and basin in the west Yangtze area. The analysis methods include the paleogeography, petrology, organic geochemistry, geochemistry. The conclusions are drawn that the source of phosphate deposits distributed along the margin originate from the weathering production of continent, while phosphate deposits along the platform and basin gain phosphorus through hot spring on the buttom of the sea floor, which is brought to the sedimentary environment by rising sea-fluid, then accumulated by the organism and microorganism, meanwhile, basin phosphorite keep relatively higher organic carbon content.

Key words: phosphorite, upwelling, hot spot activity

摘要： 采用古地理、岩石学、有机地球化学、地球化学分析的方法，对上扬子区晚震旦陡山沱组和早寒武牛蹄塘组不同类型的磷块岩进行了研究。认为早寒武世早期古陆遭受风化，被剥蚀下来的产物成为潮坪型磷块岩的主要磷质来源，在碳酸盐岩台地发生的热点活动和上升洋流从盆底深部带来的磷质，共同作为台地型磷块岩的磷源，盆地型磷块岩的磷质同样是由热点活动和上升流携带至缺氧的沉积环境中，通过藻类或微生物的富集作用成岩，并保留了较高的有机碳含量。

关键词: 磷块岩, 上升洋流, 热点活动