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Identification of similar to 1.3 Ga hydrothermal zircon from the giant Bayan Obo REE deposit (China): Implication for dating geologically-complicated REE ore system

文献类型：期刊论文

作者Li, Xiao-Chun2,3,4; Fan, Hong-Rui2,3,4; Zeng, Xi2,3; Yang, Kui-Feng2,3,4; Yang, Zhan-Feng1; Wang, Qi-Wei1; Li, Hong-Tao2,3
刊名ORE GEOLOGY REVIEWS
出版日期2021-11-01
卷号138页码:15
ISSN号0169-1368
关键词Hydrothermal zircon Monazite Geochronology The Bayan Obo deposit
DOI10.1016/j.oregeorev.2021.104405
英文摘要The Bayan Obo deposit in China hosts the largest REE resource in the world. However, the genesis of this deposit is still highly debated, largely due to a lack of consensus on the mineralization age. The Banyan Obo deposit has experienced intensive post-ore metamorphic and metasomatic overprints, so it is crucial to choose robust chronometers to determine the primary mineralization age. In this study, zircon is identified in the REE ore of the Bayan Obo deposit. The zircon grains are in contact with or contain inclusions of hydrothermal minerals (e.g., magnetite, biotite, monazite, allanite, apatite and ilmenorutile). They have variable Th contents (14 to 1139 ppm) and are poor in U (<0.8 ppm), consistent with the Th-rich and U-poor feature of the Bayan Obo REE ore. Moreover, they have substantially low contents of light REE (La to Nd; LREE), which may be due to zircon coprecipitation with LREE-rich monazite and allanite. The combined textural and compositional features imply a hydrothermal origin of the zircon grains. The hydrothermal zircon grains have a weighted mean Pb-208-Th-232 age of 1297 +/- 13 Ma, which places a direct constraint on the timing of REE mineralization at Bayan Obo. Notably, substantial LREE depletion and Th/U fractionation have not been documented before for hydrothermal zircon from other environments, and thus they could be taken as discriminative features for hydrothermal zircon from carbonatite-related REE deposits. Thorium-lead dating was also conducted on monazite from the zircon-bearing sample, yielding Pb-208-Th-232 ages (993 to 319 Ma) variably younger than that of zircon. The younger monazite Th-Pb ages could have resulted from disturbance of the Th-Pb isotopic system during post-ore modification process. Similarly, monazite has younger Th-U-Pb dates than zircon in many other geologically-complicated carbonatites or REE deposits. Such a phenomenon implies that the zircon Th-U-Pb chronometer is robust even if the host-rocks have experienced intensive modification, whereas monazite Th-U-Pb chronometer is more susceptible to modification. Therefore, younger Th-U-Pb dates of monazite should be interpreted with caution as they may record the timing of post-ore modification event or represent partial resetting, and hence geologically meaningless results.
WOS关键词U-TH-PB ; TRACE-ELEMENT COMPOSITION ; NB-FE DEPOSIT ; CREEK CARBONATITE COMPLEX ; INNER-MONGOLIA ; IN-SITU ; META-CARBONATITES ; WORKING REFERENCE ; GOLD DEPOSIT ; GEOCHRONOLOGY
资助项目National Natural Science Foundation of China (NSFC)[42072092] ; National Natural Science Foundation of China (NSFC)[41930430] ; Key Research Program of the Innovation Academy for Earth Science, CAS[IGGCAS-201901]
WOS研究方向Geology ; Mineralogy ; Mining & Mineral Processing
语种英语
出版者ELSEVIER
WOS记录号WOS:000703993300002
资助机构National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; Key Research Program of the Innovation Academy for Earth Science, CAS ; Key Research Program of the Innovation Academy for Earth Science, CAS ; Key Research Program of the Innovation Academy for Earth Science, CAS ; Key Research Program of the Innovation Academy for Earth Science, CAS ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; Key Research Program of the Innovation Academy for Earth Science, CAS ; Key Research Program of the Innovation Academy for Earth Science, CAS ; Key Research Program of the Innovation Academy for Earth Science, CAS ; Key Research Program of the Innovation Academy for Earth Science, CAS ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; Key Research Program of the Innovation Academy for Earth Science, CAS ; Key Research Program of the Innovation Academy for Earth Science, CAS ; Key Research Program of the Innovation Academy for Earth Science, CAS ; Key Research Program of the Innovation Academy for Earth Science, CAS ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; Key Research Program of the Innovation Academy for Earth Science, CAS ; Key Research Program of the Innovation Academy for Earth Science, CAS ; Key Research Program of the Innovation Academy for Earth Science, CAS ; Key Research Program of the Innovation Academy for Earth Science, CAS
源URL[http://ir.iggcas.ac.cn/handle/132A11/102705]  
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Li, Xiao-Chun
作者单位1.Baotou Res Inst Rare Earth, Baotou 014030, Peoples R China
2.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, Beijing 100029, Peoples R China
3.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China
4.Chinese Acad Sci, Innovat Acad Earth Sci, Beijing 100029, Peoples R China
推荐引用方式
GB/T 7714		 Li, Xiao-Chun,Fan, Hong-Rui,Zeng, Xi,et al. Identification of similar to 1.3 Ga hydrothermal zircon from the giant Bayan Obo REE deposit (China): Implication for dating geologically-complicated REE ore system[J]. ORE GEOLOGY REVIEWS,2021,138:15.
APA Li, Xiao-Chun.,Fan, Hong-Rui.,Zeng, Xi.,Yang, Kui-Feng.,Yang, Zhan-Feng.,...&Li, Hong-Tao.(2021).Identification of similar to 1.3 Ga hydrothermal zircon from the giant Bayan Obo REE deposit (China): Implication for dating geologically-complicated REE ore system.ORE GEOLOGY REVIEWS,138,15.
MLA Li, Xiao-Chun,et al."Identification of similar to 1.3 Ga hydrothermal zircon from the giant Bayan Obo REE deposit (China): Implication for dating geologically-complicated REE ore system".ORE GEOLOGY REVIEWS 138(2021):15.

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来源：地质与地球物理研究所

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