白云鄂博东矿各矿石类型稀土元素配分特征研究  

Study on REE Distribution Characteristics of Different Ore Types in Bayan Obo East Orebody

作　　者：李强[1] 刘雁江 魏威 金海龙 郭春雷 王维维 LI Qiang;LIU Yan-jiang;WEI Wei;JIN Hai-long;GUO Chun-lei;WANG Wei-wei(State Key Laboratory of Baiyunobo Rare Earth Resource Researches and Comprehensive Utilization,Baotou Research Institute of Rare Earths,Baotou 014030,China)

机构地区：[1]包头稀土研究院白云鄂博稀土资源研究与综合利用国家重点实验室,内蒙古包头014030

出　　处：《稀土》2022年第5期86-92,共7页Chinese Rare Earths

基　　金：国家重点研发计划(2020YFC1909100);内蒙古自治区科技创新引导资金项目(KCBJ2018077);白云鄂博稀土资源研究与综合利用国家重点实验室放课题(2020Z2142)。

摘　　要：在结合矿石分布与系统布点、取样的基础上,通过元素分析结果与地球化学、统计学等研究方法相结合,以白云鄂博矿床东矿体内现存各类型矿石为研究目标,开展了多方面的研究,发现当前采场内东矿体深部稀土最重要的矿石类型有:霓石型、萤石型和白云石型3大类共5种矿石类型;总体而言,铁矿石中稀土含量较非铁矿石要高,在白云石型与云母型矿石中REO与Fe有较为明显的正相关性;矿体中LREE、HREE分异程度较大,镧、铈、镨、钕四种元素的氧化物含量占稀土氧化物总量的93%以上,是最主要的REE元素种类;配分结果显示,矿体中LREE分馏程度高且较为富集,HREE显著亏损;各类型矿石中REE显现明显的负铕异常,与学术界中“热液叠加、多次交代”的成矿观点相吻合。本研究过程系统阐述了东矿体深部各类型矿石中的REE分布与配分模式,为进一步揭示白云鄂博矿床成因和综合利用深部稀土资源提供了一定的科学依据和理论基础。On the basis of ore distribution and systematic sampling, combined with the results of element analysis, geochemistry, statistics and other research methods, this study has carried out a variety of research on the existing types of ores in the East Orebody of Bayan Obo deposit.It is found that the most important ore types of rare earth in the East Orebody of the stope are aegirine type, fluorite type and dolomite type, with a total of five sub-types.Generally speaking, the REE content in iron ore is higher than that in other ores. In dolomite type and mica type ores, there is a positive correlation between REO and Fe.LREE and HREE in the orebody are highly differentiated, and the oxide content of lanthanum, cerium, praseodymium and neodymium accounts for more than 93% of the total REO,which are the main REE elements in the orebody.The results of distribution patterns show that LREE fractionation is high and enriched, while HREE is deplete.REE in all types of ores shows obvious negative Eu anomaly, which is consistent with the metallogenic viewpoint of “hydrothermal superposition and multiple metasomatism” in some published researches.This study systematically describes the REE distribution and distribution patterns in various types of deep ores in the East Orebody, which provides a certain scientific basis and theoretical basis for further revealing the genesis of Bayan Obo deposit and comprehensive utilization of deep rare earth resources.

关 键 词：白云鄂博 东矿体 稀土元素 配分型式 

分 类 号：P618.7[天文地球—矿床学] P575[天文地球—地质学]