Multiphase carbonatite-related magmatic and metasomatic processes in the genesis of the ore-hosting dolomite in the giant Bayan Obo REE-Nb-Fe deposit
文献类型：期刊论文
| 作者 | Liu, Shang2,3,4; Fan, Hong-Rui1,2,8; Groves, David, I6,7; Yang, Kui-Feng1,2,8; Yang, Zhan-Feng5; Wang, Qi-Wei5 |
| 刊名 | LITHOS
 |
| 出版日期 | 2020-02-01 |
| 卷号 | 354页码:22 |
| ISSN号 | 0024-4937 |
| 关键词 | Carbonatite evolution Magmatic-hydrothermal fluid Metasomatism REE enrichment Bayan Obo REE-Nb-Fe deposit |
| DOI | 10.1016/j.lithos.2019.105359 |
| 英文摘要 | The origin of dolomite that hosts the Bayan Obo REE-Nb-Fe deposit (57.4 Mt.@6% REE2O3, 2.16 Mt.@0.13% Nb2O5, and >1500 Mt.@35% iron oxides) has been controversial for decades, but it is integral to understanding of the genesis of this giant deposit. In this study, based on the textures and in situ major and trace element composition of its carbonates, the dolomite was proved to be initially generated from magnesio-ferro-carbonatite melts. It subsequently experienced magmatic-hydrothermal alteration and recrystallization in a low strain environment, caused by calcio-carbonatitic fluids, with formation of finer-grained dolomite, interstitial calcite and increasing amounts of associated fluorocarbonates. Available stable isotope analyses indicate that the recrystallized ore-hosting dolomite has higher delta C-13 and delta O-18 ratios compared to its igneous coarse-grained precursor. Rayleigh fractionation during the recrystallization process, rather than crustal contamination, played a major role in the highly-variable stable isotope composition of carbonates in the dolomite. Low-T alteration increased variability with apparently random increases in delta O-18 within carbonates. The REE, Ba and Sr were added simultaneously with the elevated (La/Yb)(cn) from magnesio-ferro-carbonatite melts to calcio-carbonatitic fluids, and to carbonatite-derived aqueous fluids, through which extensive fluorine metasomatism and alkali alteration overlapped the recrystallization of the ore-hosting dolomite. Therefore, the multi-stage REE mineralization at Bayan Obo is closely related to metasomatism by calcio-carbonatitic fluids of previously-emplaced intrusive magnesio-ferro-carbonatite bodies during late evolution of the Bayan Obo carbonatite complex. Then, the ore-hosting dolomitic carbonatite was subjected to compressive tectonics during a Paleozoic subduction event, and suffered intense, largely brittle, deformation, which partially obscured the earlier recrystallization process. The complex, multi-stage evolution of the ore-hosting dolomite is responsible for the uniqueness, high grade and giant size of the Bayan Obo deposit, the world's largest single REE resource with million tonnes of REE oxides. (C) 2019 Elsevier B.V. All rights reserved. |
| WOS关键词 | INNER-MONGOLIA ; TRACE-ELEMENTS ; NORTH CHINA ; ISOTOPIC CONSTRAINTS ; U-PB ; ROCKS ; FRACTIONATION ; CALCITE ; OXYGEN ; GEOCHRONOLOGY |
| 资助项目 | National Natural Science Foundation of China[41930430] ; Key Research Program of the Institute of Geology and Geophysics, CAS[IGGCAS-201901] ; Zhongke Developing Science and Technology Co., Ltd.[2017H1973] ; Zhongke Developing Science and Technology Co., Ltd.[ZK2018H003] ; Fundamental Research Funds for the Central Universities of China[Lzujbky-2019-pd06] |
| WOS研究方向 | Geochemistry & Geophysics ; Mineralogy |
| 语种 | 英语 |
| 出版者 | ELSEVIER |
| WOS记录号 | WOS:000514217200012 |
| 资助机构 | National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Key Research Program of the Institute of Geology and Geophysics, CAS ; Key Research Program of the Institute of Geology and Geophysics, CAS ; Key Research Program of the Institute of Geology and Geophysics, CAS ; Key Research Program of the Institute of Geology and Geophysics, CAS ; Zhongke Developing Science and Technology Co., Ltd. ; Zhongke Developing Science and Technology Co., Ltd. ; Zhongke Developing Science and Technology Co., Ltd. ; Zhongke Developing Science and Technology Co., Ltd. ; Fundamental Research Funds for the Central Universities of China ; Fundamental Research Funds for the Central Universities 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 ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Key Research Program of the Institute of Geology and Geophysics, CAS ; Key Research Program of the Institute of Geology and Geophysics, CAS ; Key Research Program of the Institute of Geology and Geophysics, CAS ; Key Research Program of the Institute of Geology and Geophysics, CAS ; Zhongke Developing Science and Technology Co., Ltd. ; Zhongke Developing Science and Technology Co., Ltd. ; Zhongke Developing Science and Technology Co., Ltd. ; Zhongke Developing Science and Technology Co., Ltd. ; Fundamental Research Funds for the Central Universities of China ; Fundamental Research Funds for the Central Universities 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 ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Key Research Program of the Institute of Geology and Geophysics, CAS ; Key Research Program of the Institute of Geology and Geophysics, CAS ; Key Research Program of the Institute of Geology and Geophysics, CAS ; Key Research Program of the Institute of Geology and Geophysics, CAS ; Zhongke Developing Science and Technology Co., Ltd. ; Zhongke Developing Science and Technology Co., Ltd. ; Zhongke Developing Science and Technology Co., Ltd. ; Zhongke Developing Science and Technology Co., Ltd. ; Fundamental Research Funds for the Central Universities of China ; Fundamental Research Funds for the Central Universities 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 ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Key Research Program of the Institute of Geology and Geophysics, CAS ; Key Research Program of the Institute of Geology and Geophysics, CAS ; Key Research Program of the Institute of Geology and Geophysics, CAS ; Key Research Program of the Institute of Geology and Geophysics, CAS ; Zhongke Developing Science and Technology Co., Ltd. ; Zhongke Developing Science and Technology Co., Ltd. ; Zhongke Developing Science and Technology Co., Ltd. ; Zhongke Developing Science and Technology Co., Ltd. ; Fundamental Research Funds for the Central Universities of China ; Fundamental Research Funds for the Central Universities 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/132A11/95596]  |
| 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 | Fan, Hong-Rui |
| 作者单位 | 1.Chinese Acad Sci, Innovat Acad Earth Sci, Beijing 100029, Peoples R China 2.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, Beijing 100029, Peoples R China 3.Lanzhou Univ, Sch Earth Sci, Lanzhou 730000, Peoples R China 4.Lanzhou Univ, Key Lab Mineral Resources Western China Gansu Pro, Lanzhou 730000, Peoples R China 5.Baotou Res Inst Rare Earth, Baotou 014030, Peoples R China 6.Univ Western Australia, Ctr Explorat Targeting, Nedlands, WA 6009, Australia 7.China Univ Geosci, State Key Lab Geol Proc & Mineral Resources, Beijing 100083, Peoples R China 8.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China |
| 推荐引用方式 GB/T 7714 | Liu, Shang,Fan, Hong-Rui,Groves, David, I,et al. Multiphase carbonatite-related magmatic and metasomatic processes in the genesis of the ore-hosting dolomite in the giant Bayan Obo REE-Nb-Fe deposit[J]. LITHOS,2020,354:22. |
| APA | Liu, Shang,Fan, Hong-Rui,Groves, David, I,Yang, Kui-Feng,Yang, Zhan-Feng,&Wang, Qi-Wei.(2020).Multiphase carbonatite-related magmatic and metasomatic processes in the genesis of the ore-hosting dolomite in the giant Bayan Obo REE-Nb-Fe deposit.LITHOS,354,22. |
| MLA | Liu, Shang,et al."Multiphase carbonatite-related magmatic and metasomatic processes in the genesis of the ore-hosting dolomite in the giant Bayan Obo REE-Nb-Fe deposit".LITHOS 354(2020):22. |
入库方式： OAI收割
来源：地质与地球物理研究所
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