摘要
Ba-REE氟碳酸盐类矿物作为白云鄂博矿床中一类特有的稀土矿物,前人开展了大量基础晶体化学方面的研究,而对其共生组合、化学成分等方面研究则相对较少。对矿体中发现的一些粗粒黄河矿晶体,本文利用场发射扫描电镜、场发射电子探针等分析测试仪器对其开展相关研究。结果表明,黄河矿多呈脉状、团聚状富集于矿石之中,与重晶石、萤石、氟碳酸盐矿物等紧密共生,具有典型的热液矿物分布特征。电子探针分析显示,黄河矿的化学成分主要为BaO(35.28%)和轻稀土元素(39.37%),此外由于元素的类质同相替换,部分形成黄河矿-氟碳铈钡矿-氟碳钙铈矿等系列矿物体衍生构造。结合前人的黄河矿年代学证据及本次的矿物共生组合关系,认为白云鄂博矿床中的黄河矿主要结晶沉淀于古生代的富F、Ba和REE的热液流体中,而其REE元素则主要来源于早期形成的稀土矿物的再活化。
The Ba-REE fluorocarbonate minerals,belong to a unique class of rare earth minerals in the Bayan Obo deposit.They have been studied regarding on the basic crystal chemistry by large numbers of previous researches,while they have been relative limitedly studied regarding on their paragenetic mineral assemblages,chemical compositions and other aspects.Some coarse-grained crystals of huanghoite-(Ce)found in the orebody have been studied in this paper by using the field emission scanning electron microscope,field emission electron microprobe and other analytical instruments.The results show that the Huanghoite-(Ce),occurred mostly in forms of veins and agglomerated aggregates in the ore,are closely intergrown with barite,fluorite and fluorocarbonate minerals,with typical distribution characteristics of hydrothermal minerals.Electron microprobe analyses show that the chemical composition of huanghoite-(Ce)is mainly composed of BaO(35.28%)and light rare earth elements(39.37%).In addition,due to the isomorphous replacement of elements,there is the intercrescence structure of huanghoite-(Ce)-bariocebaite-(Ce)-parisite and other minerals locally.Combined with the previous chronological evidence and the present mineral paragenetic assemblage relationship of huanghoite-(Ce),it is believed that the huanghoite-(Ce)in the Bayan Obo deposit mainly crystallized and precipitated in the F-,Ba-and REE-rich hydrothermal fluids in the Paleozoic era,whereas its REE elements were mainly originated from the remobilization of the rare earth minerals formed in the early period.
作者
陈彪
金海龙
孙庆
李强
刘雁江
贾晓琪
CHEN Biao;JIN Hai-long;SUN Qing;LI Qiang;LIU Yan-jiang;JIA Xiao-qi(National Key Laboratory of Baiyun Obo Rare Earth Resource Researches and Comprehensive Utilization,Baotou Research Institute of Rare Earths,Baotou,Inner Mongolia 014030,China)
出处
《矿物岩石地球化学通报》
CAS
CSCD
北大核心
2024年第5期987-997,共11页
Bulletin of Mineralogy, Petrology and Geochemistry
基金
国家重点研发计划项目(2021YFC2901704,2023YFC2908700)
内蒙古自治区自然科学基金资助项目(2021MS04004)
白云鄂博稀土资源与综合利用全国重点实验室专项课题(2022Z2406)。
关键词
白云鄂博矿
黄河矿
化学成分
扫描电镜
电子探针
Bayan Obo deposit
huanghoite-(Ce)
chemical composition
scanning electron microscope
electron microprobe
