白云鄂博铁稀土矿床中稀土元素的分配特点

有关白云鄂博铁稀土矿床中稀土元素的组成特点和赋存形式,我所在六十年代曾作了大量工作,积累了大批数据。本文主要是利用这些数据,对该矿床中的稀土元素特别是其中的Nd、Sm、Eu的分配特点作初步阐述。

DISTRIBUTION CHARACTERISTICS OF THE RARE EARTH ELEMENTS IN BAYANOBO IRON DEPOSIT

In the EEE-iron deposits studied the ores can be divided into two major types based upon the total REE content and chondrite-normalized REE patterns in ores.In the first type the total REE content ranges from 2% to 15% and the REE distribution pattern displays a monotonic line dipping towards HREE.In the second type the total REE content falls in a range from 0.5% to 2%,the chondrite-normalized REE pattern is represented by a curve with a peak at Pr suggesting the relative enrichment of Pr,Nd,etc.The difference between two REE distribution patterns of ores can presumably be attributed to the different alkalinity of oreforming medium.The chondrites normalized REE patterns do not show the negative anomalies of Eu,suggesting that the ores were formed under oxidation condition.