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Genetic relationship between fenitized ores and hosting dolomite carbonatite of the Bayan Obo REE deposit, Inner Mongolia, China

文献类型：期刊论文

作者Wang, Kaiyi1; Fang, Aimin1; Zhang, Jien1; Yu, Liangjun1; Dong, Ce1; Zan, Jingfeng2; Hao, Meizhen2; Hu, Fuyou1
刊名JOURNAL OF ASIAN EARTH SCIENCES
出版日期2019-05-01
卷号174页码:189-204
关键词Dolomite carbonatite Fenitization Micro-texture Bayan Obo deposit
ISSN号1367-9120
DOI10.1016/j.jseaes.2018.12.007
英文摘要The Bayan Obo deposit is the largest rare-earth element (REE) deposit in the world. In this deposit, ore bodies are hosted in fine-grained ore-bearing dolomite marbles, known as the H8 dolomite marble. The H8 dolomite marble has been considered as part of the Bayan Obo Group composed Paleoproterozoic sedimentary rocks. However, the H8 dolomite marble can be younger than the Bayan Obo Group, and thus, the genesis of the dolomite marble should be re-examined. In this paper, we describe petrography and compositions of the H8 dolomite marble. The dolomite marbles generally have high FeO, MnO and SrO contents, different from sedimentary limestone or dolostone but similar to dolomite carbonatites. In composition, they can be grouped into magnesio-carbonatite and ferro-carbonatite. Texturally they are porphyritic and comprise originally hypabyssal intrusions. It is thus proposed that carbonatitic magmas injected slowly into a magma chamber where they have undergone fractionation to produce evolved dolomite-carbonatite magmas rich in alkali, REE, Fe and volatile components. Such evolved, metal-rich magmas were consequently injected along the contact zone between the early dolomite carbonatite sill and other layer of the Bayan Obo Group, and produced an large fenitization aureole enclosing ores rich in Fe, Nb, REE, F and alkali metals. Changes in CO2/H2O ratios, oxygen fugacity and halogen content of fluids were responsible for the formation of different types of ore, including massive magnetite-rich, aegirine-rich and Na-amphibole-rich ores. Considering the fact that the ore bodies are located at the place where dolomite carbonatites are relatively thick and the fenitization is relatively extensive, we speculate that the ore formation was genetically related to extensive fenitization involving exsolution of large amounts of fluids and subsequently extensive metasomatism. It is concluded that carbonatitic magmas played a major role in the formation of the REE mineralization in the Bayan Obo deposit.
WOS关键词NB-FE DEPOSIT ; SM-ND ; U-PB ; GEOCHEMICAL CONSTRAINTS ; ISOTOPE ; GENESIS ; EVOLUTION ; GEOCHRONOLOGY ; COMPLEX ; OXYGEN
资助项目National Nature Science Foundation of China[41372081]
WOS研究方向Geology
语种英语
WOS记录号WOS:000465056600014
出版者PERGAMON-ELSEVIER SCIENCE LTD
资助机构National Nature Science Foundation of China ; National Nature Science Foundation of China ; National Nature Science Foundation of China ; National Nature Science Foundation of China ; National Nature Science Foundation of China ; National Nature Science Foundation of China ; National Nature Science Foundation of China ; National Nature Science Foundation of China ; National Nature Science Foundation of China ; National Nature Science Foundation of China ; National Nature Science Foundation of China ; National Nature Science Foundation of China ; National Nature Science Foundation of China ; National Nature Science Foundation of China ; National Nature Science Foundation of China ; National Nature Science Foundation of China
源URL[http://ir.iggcas.ac.cn/handle/132A11/91294]  
专题中国科学院地质与地球物理研究所
通讯作者Wang, Kaiyi
作者单位1.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China
2.Baotou Iron & Steel Grp Ltd Co, Bayan Obo Iron Mine, Baotou 014015, Inner Mongolia, Peoples R China
推荐引用方式
GB/T 7714		 Wang, Kaiyi,Fang, Aimin,Zhang, Jien,et al. Genetic relationship between fenitized ores and hosting dolomite carbonatite of the Bayan Obo REE deposit, Inner Mongolia, China[J]. JOURNAL OF ASIAN EARTH SCIENCES,2019,174:189-204.
APA Wang, Kaiyi.,Fang, Aimin.,Zhang, Jien.,Yu, Liangjun.,Dong, Ce.,...&Hu, Fuyou.(2019).Genetic relationship between fenitized ores and hosting dolomite carbonatite of the Bayan Obo REE deposit, Inner Mongolia, China.JOURNAL OF ASIAN EARTH SCIENCES,174,189-204.
MLA Wang, Kaiyi,et al."Genetic relationship between fenitized ores and hosting dolomite carbonatite of the Bayan Obo REE deposit, Inner Mongolia, China".JOURNAL OF ASIAN EARTH SCIENCES 174(2019):189-204.

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来源：地质与地球物理研究所

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