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The Bayan Obo (China) giant REE accumulation conundrum elucidated by intense magmatic differentiation of carbonatite

文献类型：期刊论文

作者Yang, Kuifeng1,2,3,4; Fan, Hongrui1,2,4; Pirajno, Franco3; Li, Xiaochun2,4
刊名GEOLOGY
出版日期2019-12-01
卷号47期号:12页码:1198-1202
ISSN号0091-7613
DOI10.1130/G46674.1
英文摘要The Bayan Obo deposit in China is endowed with the largest rare earth element (REE) resource in the world. The mechanism resulting in this REE enrichment has been the focus of many studies. Carbonatite is known globally as the most favorable carrier of REE ores. In the Bayan Obo deposit, REE ores are hosted in dolomites (including coarse-grained and fine-grained varieties), and many carbonatite dikes (ferroan, magnesian, and calcic) have been identified. All of the dolomites and carbonatite dikes appear to be broadly coeval and possess similar geochemical characteristics. The Sm-Nd isochron age of apatite (1317 +/- 140 Ma) from coarse-grained dolomite is consistent with the Th-Pb age of monazite (1321 +/- 14 Ma) from a calciocarbonatite dike. The epsilon(Nd(t)) values and initial Sr-87/Sr-86 ratios at 1.3 Ga of apatite from coarse-grained dolomite show a tight cluster between -2.5 and +1.0 and between 0.70266 and 0.70293, respectively. The delta O-18(VSMOW) values (relative to Vienna standard mean ocean water) of apatite also vary narrowly from 5.0 parts per thousand to 6.2 parts per thousand. These results are consistent with primary mantle-derived carbonatite and prove a magmatic origin for the ore-hosting dolomite. Furthermore, the rim and core texture of dolomite and calcite in the magnesian and calcic carbonatite dikes shows that carbonatite at Bayan Obo has an evolutionary sequence from ferroan through magnesian to calcic in nature. There is a clear negative correlation between the iron content and REE concentration in different stages of carbonatite. Intense magmatic differentiation of carbonatite is likely the critical factor for the giant REE accumulation.
WOS关键词INNER-MONGOLIA ; NB DEPOSIT ; GENESIS ; FENITIZATION ; CONSTRAINTS ; COMPLEX ; ROCKS ; PB
资助项目National Key R&D Program of China[2017YFC0602302] ; National Natural Science Foundation of China[41372099] ; National Natural Science Foundation of China[41930430] ; Zhongke Developing Science and Technology Co., Ltd.[2017H1973] ; Zhongke Developing Science and Technology Co., Ltd.[ZK2018H003]
WOS研究方向Geology
语种英语
WOS记录号WOS:000504335600026
出版者GEOLOGICAL SOC AMER, INC
资助机构National Key R&D Program of China ; National Key R&D Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Zhongke Developing Science and Technology Co., Ltd. ; Zhongke Developing Science and Technology Co., Ltd. ; National Key R&D Program of China ; National Key R&D Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Zhongke Developing Science and Technology Co., Ltd. ; Zhongke Developing Science and Technology Co., Ltd. ; National Key R&D Program of China ; National Key R&D Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Zhongke Developing Science and Technology Co., Ltd. ; Zhongke Developing Science and Technology Co., Ltd. ; National Key R&D Program of China ; National Key R&D Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Zhongke Developing Science and Technology Co., Ltd. ; Zhongke Developing Science and Technology Co., Ltd.
源URL[http://ir.iggcas.ac.cn/handle/132A11/95863]  
专题地质与地球物理研究所_中国科学院矿产资源研究重点实验室
通讯作者Yang, Kuifeng; Fan, Hongrui
作者单位1.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China
2.Chinese Acad Sci, Key Lab Mineral Resources, Inst Geol & Geophys, Beijing 100029, Peoples R China
3.Univ Western Australia, Ctr Explorat Targeting, 35 Stirling Highway, Crawley, WA 6009, Australia
4.Chinese Acad Sci, Innovat Acad Earth Sci, Beijing 100029, Peoples R China
推荐引用方式
GB/T 7714		 Yang, Kuifeng,Fan, Hongrui,Pirajno, Franco,et al. The Bayan Obo (China) giant REE accumulation conundrum elucidated by intense magmatic differentiation of carbonatite[J]. GEOLOGY,2019,47(12):1198-1202.
APA Yang, Kuifeng,Fan, Hongrui,Pirajno, Franco,&Li, Xiaochun.(2019).The Bayan Obo (China) giant REE accumulation conundrum elucidated by intense magmatic differentiation of carbonatite.GEOLOGY,47(12),1198-1202.
MLA Yang, Kuifeng,et al."The Bayan Obo (China) giant REE accumulation conundrum elucidated by intense magmatic differentiation of carbonatite".GEOLOGY 47.12(2019):1198-1202.

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来源：地质与地球物理研究所

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