REE Enrichment in Early Cambrian Gezhongwu Formation Phosphorous Rock Series in Sanjia, Zhijin County, Guizhou Province, China

摘要

Phosphate concretions from the Gezhongwu Formation at Sanjia, Zhijin County, China, were studied systematically in this work. In terms of the rales of variation of REE, trace elements, major elements and oxides, in combination with the concentration characteristics of small shelly fossils, it is considered that small shelly fossils occurring at the bottom of the Cambrian System contribute a lot to the phosphate concretions and that there are two stages of REE and phosphorus minerogenesis. The phosphate concretions have a good correlation with the contents of REE and phosphorus rather than the abundance of small shelly fossils.