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Mesoproterozoic and Paleozoic hydrothermal metasomatism in the giant Bayan Obo REE-Nb-Fe deposit: Constrains from trace elements and Sr-Nd isotope of fluorite and preliminary thermodynamic calculation
Liu, Shang1,2; Fan, Hong-Rui1,2,3; Yang, Kui-Feng1,2,3; Hu, Fang-Fang1,2,3; Wang, Kai-Yi1; Chen, Fu-Kun4; Yang, Yue-Heng1,2,3; Yang, Zhan-Feng5; Wang, Qi-Wei5
2018-07-01
Source PublicationPRECAMBRIAN RESEARCH
ISSN0301-9268
Volume311Pages:228-246
AbstractFluorite of various occurrences could portray the hydrothermal metasomatism occurred in the giant Bayan Obo REE-Nb-Fe ore deposit. Two Mesoproterozoic and Paleozoic hydrothermal events with distinguished fluid origin and geochemical properties have been studied. In Mesoproterozoic, discrete fluorite from the dolomite-dominating REE-Nb ores and banded fluorite aggregates from the banded REE-Nb-Fe ores are extremely enriched in LREE and depleted in HFSE compared with the primitive mantle. In Paleozoic, fluorite from veined-breccia REENb ores varies significantly in trace element components, ranging from LREE-enriched HFSE-depleted fluorite to fluorite with "flat" REE pattern and extremely depletion of Zr. The veined fluorites have variable and higher radiogenic Sr isotopic components (initial Sr-87/Sr-86 ratios: 0.703464-0.708208) than the discrete and banded fluorite (0.703183-0.705047), indicating crustal contamination in the Paleozoic hydrothermal fluids from Precambrian basement rocks and Bayan Obo Group. Fluorites of different occurrences and associated bastnasite and monazite have similar Nd isotopic components and Nd evolution history, which is mostly consistent with whole rock of the ore-hosting dolomite. The Sm-Nd system of some fluorite and bastnasite were reset during the Paleozoic alteration triggered by the closure of Paleo-Asian Ocean. In such geological setting, according to the delta S-34 of the dominating sulfur-bearing mineral, Paleozoic veined sulfides (similar to 0 +/- 3 parts per thousand), the prime sulfur source was oceanic crust/MORB. Relatively high delta S-34 of barite (-similar to 13-14 parts per thousand) was caused by fractionation of sulfur isotopes at an equilibrium temperature of 400-430 degrees C, rather than contribution from ancient seawater. The trace element, Sr-Nd isotope of fluorite and sulfur isotope characters of sulfides indicate carbonatitic origin of the Mesoproterozoic hydrothermal fluids, while the Paleozoic fluids, derived from subducted Paleo-Asian oceanic crust, carried sulfur components from MORB, scavenged high radiogenic Sr components from Precambrian basement rocks or Bayan Obo group, may leached a deep-seated carbonatite stock and finally altered the Mesoproterozoic mineralized ore-hosting dolomite. Both the Mesoproterozoic and Paleozoic hydrothermal fluids had initial temperature of similar to 400-500 degrees C, and gangue minerals (fluorite, sulfide and sulfate) precipitated at the temperature of similar to 320-440 'C. Preliminary thermodynamic calculations of the REE-F-C-Ca system constrained that the pressure of both fluids would not exceed 2 kbar. The drop of temperature and increase of pH are two critical factors to REE mineralization. Paragenesis of Fe-bearing minerals indicates an increase of fO(2) in the Mesoproterozoic hydrothermal fluids and a drop of fS(2) in the Paleozoic fluids in the Fe-O-S system. Furthermore, in the Ca-F-C-O system, the Mesoproterozoic hydrothermal fluids evolved with increasing aCa(2+) and decreasing aF(-), while the Paleozoic fluids present characteristic of mixing origin again with significantly variable aCa(2 +/-) and aF(-).
KeywordHydrothermal Fluorite Geochemistry Thermodynamic Bayan Obo REE-Nb-Fe deposit
DOI10.1016/j.precamres.2018.04.021
Funding OrganizationNational Key R&D Program of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Key R&D Program of China ; 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 ; Society of Economic Geology ; Society of Economic Geology ; Society of Economic Geology ; Society of Economic Geology ; National Key R&D Program of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Key R&D Program of China ; 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 ; Society of Economic Geology ; Society of Economic Geology ; Society of Economic Geology ; Society of Economic Geology ; National Key R&D Program of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Key R&D Program of China ; 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 ; Society of Economic Geology ; Society of Economic Geology ; Society of Economic Geology ; Society of Economic Geology ; National Key R&D Program of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Key R&D Program of China ; 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 ; Society of Economic Geology ; Society of Economic Geology ; Society of Economic Geology ; Society of Economic Geology
WOS KeywordRARE-EARTH-ELEMENTS ; NORTH CHINA CRATON ; ORE-BEARING DOLOMITE ; PARTIAL MOLAL PROPERTIES ; ZIRCON U-PB ; INNER-MONGOLIA ; FLUID-INCLUSION ; SM-ND ; HIGH-PRESSURES ; GEOCHEMICAL CONSTRAINTS
Language英语
Funding ProjectNational Key R&D Program of China[2017YFC0602302] ; Zhongke Developing Science and Technology Co., Ltd[2017H1973] ; Society of Economic Geology
Funding OrganizationNational Key R&D Program of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Key R&D Program of China ; 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 ; Society of Economic Geology ; Society of Economic Geology ; Society of Economic Geology ; Society of Economic Geology ; National Key R&D Program of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Key R&D Program of China ; 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 ; Society of Economic Geology ; Society of Economic Geology ; Society of Economic Geology ; Society of Economic Geology ; National Key R&D Program of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Key R&D Program of China ; 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 ; Society of Economic Geology ; Society of Economic Geology ; Society of Economic Geology ; Society of Economic Geology ; National Key R&D Program of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Key R&D Program of China ; 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 ; Society of Economic Geology ; Society of Economic Geology ; Society of Economic Geology ; Society of Economic Geology
WOS Research AreaGeology
WOS SubjectGeosciences, Multidisciplinary
WOS IDWOS:000435621700013
PublisherELSEVIER SCIENCE BV
Citation statistics
Cited Times:2[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.iggcas.ac.cn/handle/132A11/88179
Collection矿产资源研究院重点实验室
Corresponding AuthorFan, Hong-Rui
Affiliation1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, Beijing 100029, Peoples R China
2.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China
3.Chinese Acad Sci, Inst Earth Sci, Beijing 100029, Peoples R China
4.Univ Sci & Technol China, Sch Earth & Space Sci, Key Lab Crust Mantle Mat & Environm, Hefei 230026, Anhui, Peoples R China
5.Baotou Res Inst Rare Earth, Baotou 014030, Peoples R China
First Author AffilicationKey Laboratory of Mineral Resources, Chinese Academy of Sciences
Corresponding Author AffilicationKey Laboratory of Mineral Resources, Chinese Academy of Sciences;  Institute of Geology and Geophysics, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Liu, Shang,Fan, Hong-Rui,Yang, Kui-Feng,et al. Mesoproterozoic and Paleozoic hydrothermal metasomatism in the giant Bayan Obo REE-Nb-Fe deposit: Constrains from trace elements and Sr-Nd isotope of fluorite and preliminary thermodynamic calculation[J]. PRECAMBRIAN RESEARCH,2018,311:228-246.
APA Liu, Shang.,Fan, Hong-Rui.,Yang, Kui-Feng.,Hu, Fang-Fang.,Wang, Kai-Yi.,...&Wang, Qi-Wei.(2018).Mesoproterozoic and Paleozoic hydrothermal metasomatism in the giant Bayan Obo REE-Nb-Fe deposit: Constrains from trace elements and Sr-Nd isotope of fluorite and preliminary thermodynamic calculation.PRECAMBRIAN RESEARCH,311,228-246.
MLA Liu, Shang,et al."Mesoproterozoic and Paleozoic hydrothermal metasomatism in the giant Bayan Obo REE-Nb-Fe deposit: Constrains from trace elements and Sr-Nd isotope of fluorite and preliminary thermodynamic calculation".PRECAMBRIAN RESEARCH 311(2018):228-246.
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