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Hydrothermal genesis of Nb mineralization in the giant Bayan Obo REE-Nb-Fe deposit (China): Implicated by petrography and geochemistry of Nb-bearing minerals

文献类型：期刊论文

作者Liu, Shang1,8; Ding, Lin1,2,8; Fan, Hong-Rui3,4,5; Yang, Kui-Feng3,4,5; Tang, Yan-Wen6; She, Hai-Dong3,4; Hao, Mei-zhen7
刊名PRECAMBRIAN RESEARCH
出版日期2020-09-15
卷号348页码:24
ISSN号0301-9268
关键词Nb mineralization Nb-bearing minerals Hydrothermal Bayan Obo REE-Nb-Fe deposit
DOI10.1016/j.precamres.2020.105864
英文摘要The Bayan Obo REE-Nb-Fe deposit, which reserves the current largest REE resources globally, also hosts over 70% of China's Nb resources. Unlike many world-class carbonatite-related Nb deposits (e.g. Morro dos Seis Lagos and Araxa, Brazil) with igneous or secondary origin, Nb was mainly stored in Nb-bearing minerals (aeschynite, ilmenorutile, baotite, fergusonite etc.) of hydrothermal origin at Bayan Obo, supported by evidence from petrography, element and isotopic geochemistry. Although igneous fersmite and columbite were occasionally discovered in local carbonatite dykes, the Mesoproterozoic and Paleozoic hydrothermal metasomatism occurred in the ore-hosting dolomite, related to carbonatite intrusion and the closure of Paleo-Asian Ocean respectively, has played a more significant role during the ultimate Nb enrichment. REE, however, was significantly enriched during both the carbonatite-related magmatic and hydrothermal processes. Consequently, there was differentiated mineralization between REE and Nb in the carbonatite dykes and the ores. Niobium mineralization at Bayan Obo is rather limited in Mesoproterozoic carbonatite, whereas more extensive in the metasomatized orehosting dolomite, and generally postdating the REE mineralization at the same stage. According to mineral geochemistry, Bayan Obo aeschynite was classified into 3 groups: aeschynite-(Nd) with convex REE patterns (Group 1); aeschynite-(Ce) (Group 2) and nioboaeschynite (Group 3) with nearly flat REE patterns. Aeschynite (Group 1), ilmenorutile and fergusonite precipitated from Paleozoic hydrothermal fluids with advanced fractionation of Ce-rich REE minerals. The Mesoproterozoic hydrothermal Nb mineralization, represented by aeschynite (Group 3) and baotite, occurred postdating REE mineralization at same stage. Besides, fersmite and aeschynite (Group 2) precipitated from the Mesoproterozoic REE-unfractionated melt and hydrothermal fluids, respectively. All above Nb-bearing minerals exhibit extreme Nb-Ta fractionation as a primary geochemical characteristic of mantle-derived carbonatite. The forming age of the aeschynite megacrysts (Group 1) has not been accurately determined. However, the potential age was constrained to similar to 430 Ma or alternatively similar to 270-280 Ma subjected to subduction and granite activity, respectively. These aeschynite crystals inherited REEs from multiphase former REE mineralization, with an intermediate apparent Sm-Nd isochron age between the Mesoproterozoic and the Paleozoic REE mineralization events.
WOS关键词RICH CARBONATITE DYKE ; LA-ICP-MS ; INNER-MONGOLIA ; TRACE-ELEMENTS ; ORE-DEPOSIT ; DOLOMITE MARBLE ; U-PB ; AESCHYNITE-GROUP ; CONSTRAINTS ; NIOBIUM
资助项目National Natural Science Foundation of China[41902066] ; National Natural Science Foundation of China[41930430] ; Fundamental Research Funds for the Central Universities of China[Lzujbky-2019-pd06] ; Fundamental Research Funds for the Central Universities of China[2022019zr106]
WOS研究方向Geology
语种英语
出版者ELSEVIER
WOS记录号WOS:000567091500009
资助机构National Natural Science Foundation of China ; National Natural Science Foundation of China ; Fundamental Research Funds for the Central Universities of China ; Fundamental Research Funds for the Central Universities of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Fundamental Research Funds for the Central Universities of China ; Fundamental Research Funds for the Central Universities of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Fundamental Research Funds for the Central Universities of China ; Fundamental Research Funds for the Central Universities of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Fundamental Research Funds for the Central Universities of China ; Fundamental Research Funds for the Central Universities of China
源URL[http://ir.iggcas.ac.cn/handle/132A11/98225]  
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Liu, Shang
作者单位1.Lanzhou Univ, Sch Earth Sci, Lanzhou 730000, Peoples R China
2.Chinese Acad Sci, Inst Tibetan Plateau Res, Beijing 100101, Peoples R China
3.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, Beijing 100029, Peoples R China
4.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China
5.Chinese Acad Sci, Innovat Acad Earth Sci, Beijing 100029, Peoples R China
6.Chinese Acad Sci, Inst Geochem, State Key Lab Ore Deposit Geochem, Guiyang 550002, Peoples R China
7.Baotou Iron & Steel Grp, Bayan Obo Iron Mine, Baotou 014080, Peoples R China
8.Key Lab Mineral Resources Western China Gansu Pro, Lanzhou 730000, Peoples R China
推荐引用方式
GB/T 7714		 Liu, Shang,Ding, Lin,Fan, Hong-Rui,et al. Hydrothermal genesis of Nb mineralization in the giant Bayan Obo REE-Nb-Fe deposit (China): Implicated by petrography and geochemistry of Nb-bearing minerals[J]. PRECAMBRIAN RESEARCH,2020,348:24.
APA Liu, Shang.,Ding, Lin.,Fan, Hong-Rui.,Yang, Kui-Feng.,Tang, Yan-Wen.,...&Hao, Mei-zhen.(2020).Hydrothermal genesis of Nb mineralization in the giant Bayan Obo REE-Nb-Fe deposit (China): Implicated by petrography and geochemistry of Nb-bearing minerals.PRECAMBRIAN RESEARCH,348,24.
MLA Liu, Shang,et al."Hydrothermal genesis of Nb mineralization in the giant Bayan Obo REE-Nb-Fe deposit (China): Implicated by petrography and geochemistry of Nb-bearing minerals".PRECAMBRIAN RESEARCH 348(2020):24.

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来源：地质与地球物理研究所

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