贵州寒武纪梅树村期磷块岩稀土元素存在形式研究

本文对织金新华、铜仁坝黄以及遵义松林等不同沉积环境的磷块岩进行了较系统的研究,认为贵州寒武纪梅树村期磷块岩中主要矿石矿物是氟磷灰石或低碳的碳氟磷灰石,稀土元素的富集与成磷环境关系不密切,主要伴生矿物白云石、黏土矿物、硅质矿物中稀土元素含量较低,小壳生物化石中也未见稀土异常,REE主要以类质同象形式赋存于碳氟磷灰石晶格中。

The modes of occurrence of rare earth elements in posphorite of Meishucun stage of cambrian in Guizhou

Systematic research on the posphorite in the different depositional environment such as Xinhua Zhijin,Bahuang Tongren and Songlin Zunyi.The results indicate that fluorapatite or lower carbonate fluorapatite is the main phosphatic mineral in the posphorite of Meishucun Stage of Cambrian in Guizhou.We came to the conclusion that the relations of REE enrichment and environmental are not close.The chemical analyses isillustrate that carbonate fluorapatite had higher levels of REE than clay mineral,dolomite and siliceous mineral.It is suggested that the REE contents in the section increased positively with increasing phosphorite content,and their relationship with biological fossils were not apparent,most of REE is occurred in form of isomorphism coming into crystal defect and crystal interface of carbonate fluorapatite.