Exotic REE behaviors of zircon in the Koktokay No. 3 granitic pegmatite, Xinjiang, northwest China

doi:10.1016/j.oregeorev.2023.105329

	Zhao, Yan 1; Yang, Wubin 2,3; Leng, Chengbiao 1; Shan, Qiang2,3 ; Niu, Hecai2,3 ; Li, Ningbo 2,3
	Exotic REE behaviors of zircon in the Koktokay No. 3 granitic pegmatite, Xinjiang, northwest China
刊名	ORE GEOLOGY REVIEWS
ISSN号	0169-1368
	2023
卷号	154 页码:105329
DOI	10.1016/j.oregeorev.2023.105329
语种	英语
WOS研究方向	Geology ; Mineralogy ; Mining & Mineral Processing
摘要	Rare earth elements (REEs) can be incorporated into zircon at significant concentrations that are controlled by the temperature, pressure, and composition of their growth environment. However, the distribution of REEs between zircon and melt does not always conform to the currently available partitioning data. This study presents evidence of exotic REE behaviors in zircon from the marginal zone of the Koktokay No. 3 granitic pegmatite in Xinjiang, northwest China. The behavior of the Koktokay REEs represents by large negative Ce anomalies, flat heavy REE patterns, and lanthanide tetrad effects. Two generations of zircon (Zrn-I and Zrn-II) are identified, which were formed by dissolution and re-precipitation processes. Zrn-I represents relic zircon domains with dissolution textures that formed from pegmatite melt during the late stage of the magmatic–hydrothermal transition. Zrn-II occurs as overgrowths and infilling fractures around or within Zrn-I, which formed by hydrothermal re-precipitation. From Zrn-I to Zrn-II, the zircon exhibits increasingly negative Ce anomalies and greater enrichment in light REEs and other non-stochiometric elements (e.g., Ca, Al, Fe, and Mg). Given the lack of Ce depletion in the host granite, the negative Ce anomalies in zircon can be attributed to Ce being sequestered into hydrothermal minerals (i.e., cerianite and/or Fe–Mn oxyhydroxides) as tetravalent Ce. In addition, the flat heavy REE patterns of both Zrn-I and Zrn-II likely resulted from the crystallization of heavy REE-enriched minerals, such as zircon and garnet, and were further enhanced by hydrothermal alteration. The two generations of zircon display identical M-type lanthanide tetrad effects in REE patterns, with similar TE3 values. This ubiquitous M-type tetrad effect of the REEs in garnet, zircon, and the host granite can be attributed to the exsolution and subsequent interaction with magmatically derived fluids containing F–aquo-complexes. Therefore, we conclude that such anomalous REE incorporation into zircon from a hydrous pegmatitic melt is controlled by the evolution of the hydrous melt and dissolution–re-precipitation processes. Our results suggest that the reliability of zircon REE partitioning data should be revaluated, and that further experimental studies are needed to fully understand the behavior of REEs in hydrothermal systems. ? 2023 The Author(s)
关键词	JACK HILLS U-PB LIQUID IMMISCIBILITY HYDROTHERMAL ZIRCON LANTHANIDE TETRADS ELEMENT PATTERNS OXIDATION-STATE TRACE-ELEMENTS NW CHINA ALTAI
WOS记录号	WOS:000964405400001
收录类别	SCI
引用统计	被引频次：6[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.gig.ac.cn/handle/344008/80300
专题	中国科学院矿物学与成矿学重点实验室
作者单位	1.State Key Laboratory of Nuclear Resources and Environment, East China University of Technology, Nanchang; 330013, China 2.Key Laboratory of Mineralogy and Metallogeny, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences/Guangdong Provincial Key Laboratory of Mineral Physics and Materials, Guangzhou; 510640, China 3.CAS Center for Excellence in Deep Earth Science, Guangzhou; 510640, China
推荐引用方式 GB/T 7714	Zhao, Yan,Yang, Wubin,Leng, Chengbiao,et al. Exotic REE behaviors of zircon in the Koktokay No. 3 granitic pegmatite, Xinjiang, northwest China[J]. ORE GEOLOGY REVIEWS,2023,154:105329.
APA	Zhao, Yan,Yang, Wubin,Leng, Chengbiao,Shan, Qiang,Niu, Hecai,&Li, Ningbo.(2023).Exotic REE behaviors of zircon in the Koktokay No. 3 granitic pegmatite, Xinjiang, northwest China.ORE GEOLOGY REVIEWS,154,105329.
MLA	Zhao, Yan,et al."Exotic REE behaviors of zircon in the Koktokay No. 3 granitic pegmatite, Xinjiang, northwest China".ORE GEOLOGY REVIEWS 154(2023):105329.