对贵州织金新华含稀土磷矿床进行的稀土元素分析结果表明,磷块岩中含稀土总量EREE较高,LREE/HREE比值较大,富集La、Nd、及Y等轻稀土及重稀土元素。普遍具Ce、Eu的负异常,稀土分配模式等显示海相沉积源区继承性及热水源加入特征。生物碎屑、白云石及胶磷矿的单矿物微量元素分析证明,稀土元素含量与胶磷矿密切相关。胶磷矿中稀土元素含量大于其它矿物中稀土含量。扫描电镜及电子探针分析研究表明,稀土元素主要不是以独立矿物形式存在。化学物相分析研究证明,稀土元素多以类质同象形式存在于磷灰石中,少量被粘土矿物相吸附。解决了该类型矿床稀土元素赋存状态长期未解决的问题。综合研究表明,稀土元素赋存状态主要以类质同象形式存在于磷灰石晶格中,稀土元素的含量与胶磷矿密切相关。
The REE and compsition of trace elements analysis show that phosphorite -- ores are rich in EREE concentration generally in Xinhua,Zhijin. The phosphorite has quite abundant Y,La,Nd element. The LREE/HREE ratio is higher in ore--depsits and lower on top of roof rock. There are Ce anomaly generally, It shows forming--deposit is high oxidation environment and characteristic is heritance of orginal region. The REE patterns of chondrite-- normailzed and NASC--normalized Ce anomaly,LREE/HREE ratio ,characteristic trace element and mineal rock confirm that there are the sidiments of biology-chemistry and mixing of hot seawater sediments in Xinhua. This paper discussed the special property and the laws of moving-concentration on the oxidizeing-orebody of the phosphorite in Xinhua ,Zhijin. The test mode of chemical analysis of single mineral, chemistry phase analysis, scanning electron microscope analysis and electron probe microanalysis, etc. were adopted. It is showed that the part of having the few deal rare earth element is adsorbed hy the clay mineral, much for the type of quality isomorphic form exist in the apatite crystal structure of phosphorite inside.