摘要
鄂西陡山沱组磷块岩的稀土元素总量较低,变化较小,具有轻稀土相对富集,重稀土贫乏的特点。稀土元素含量与磷块岩的结构类型、成因和粘土矿物含量有关。震旦纪生物成因的磷块岩以低稀土元素含量为特征,这与寒武纪以来生物成因的磷块岩截然不同。鄂西陡山沱组含有三个工业磷矿层,各矿层稀土元素配分模式、参数等有明显差异,依据这些特征可准确地进行矿区和区域矿层的划分与对比,也可用于对物质来源和沉积环境的解释。
Low in the ΣREE abundance, phosphorites of the Sinian Doushantou Forma-tion in Western Hubei exhibit relative enrichment in LREE and depletion in HR-EE. The REE content in phosphorites is related to the genetic types of phosphoritesand the clay mineral content, i. e. the biogenic phosphorites with a low clay con-tent have lower REE contents, which indicates that the phosphorites in WesternHubei is closely related to the biological processes. There are three phosphorite beds of commercial value in the Doushantou For-mation in Western Hubei. The REE distribution, REE distribution patterns andREE parameters are notably different and change regularly in these beds. On thatbasis coupled With the petrology and sedimentology of phosphorites in each layer,the regional phosphatic bed division and correlation can be accurately made in thephosphorite district, and meanwhile the REE characteristics may be used in inter-preting the phosphatic source and depositional environments.
出处
《地质论评》
CAS
CSCD
北大核心
1992年第4期352-359,共8页
Geological Review
关键词
磷块岩
稀土元素
地球化学
震旦纪
phosphorite
REE
phosphatic bed dirision and correlation
depositional environments
