关键词: 磷块岩, 上升洋流, 热点活动

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