白云鄂博矿床钍的赋存状态及其对周边矿物的影响  

Occurrence State of Thorium and Its Influence on Surrounding Minerals in Bayan Obo Deposit

作　　者：杨莉[1] 王昭静 杨波 李丹煜 王金龙[1] YANG Li;WANG Zhao-jing;YANG Bo;LI Dan-yu;WANG Jin-long(Mine Research Institute of Baotou Steel(Group)Corp.,Baotou 014010,China)

机构地区：[1]包钢矿山研究院,内蒙古包头014010

出　　处：《稀土》2021年第4期52-62,共11页Chinese Rare Earths

基　　金：内蒙古财政厅规划项目。

摘　　要：白云鄂博矿床不同类型的铌、稀土铁矿石中均不同程度含有钍、铀,钍元素除形成独立矿物方钍石、钍石外,多以类质同象的形式赋存于稀土矿物及稀土铌矿物中,这是因为钍的离子半径和负电荷与铈族稀土近似。钍的放射性使与其紧密接触的萤石矿物有放射性晕圈,萤石颜色呈深紫色-紫黑色,钪含量增高,部分萤石发生异常干涉色,呈现非均性。In addition to forming independent minerals thorianite and thorite, thorium element in Bayan Obo deposite occurs mainly in form of isomorphism in rare earth minerals and niobium-rare earth minerals because there are approximate ion radius and negative charge between thorium element and cerium group elements. The radioactivity of thorium element makes the fluorite in close contact with it have some radioactive haloes. With the color changing of fluorite from dark purplish to purple black, the content of scandium increases, and some fluorites have abnormal interference colors and present heterogeneity.

关 键 词：白云鄂博 钍 赋存状态 放射性影响 

分 类 号：P57[天文地球—矿物学] P617[天文地球—地质学]