Mineralogy and U-Pb geochronology of REE fluorocarbonates from the Gansha Obo REE deposit, northwest China

doi:10.1016/j.oregeorev.2021.104266

GIG OpenIR

	Li, Ao 1,2; Yang, Wu-Bin 1,3; Niu, He-Cai 1,3; Shan, Qiang 1,3; Jia, Chun 4
	Mineralogy and U-Pb geochronology of REE fluorocarbonates from the Gansha Obo REE deposit, northwest China
刊名	ORE GEOLOGY REVIEWS
ISSN号	0169-1368
	2021-09-01
卷号	136 页码:9
DOI	10.1016/j.oregeorev.2021.104266
语种	英语
WOS研究方向	Geology ; Mineralogy ; Mining & Mineral Processing
摘要	The Gansha Obo deposit is a recently discovered rare earth element (REE) deposit in northwestern China, with REE2O3 reserves of 0.6 Mt at 1.39-1.65 wt%. It is hosted in the Early Cretaceous Gansha Obo alkaline-carbonatite igneous complex. In this study, we present a detailed investigation of the carbonate mineral assemblage in the economic carbonatite veins in the Gansha Obo REE deposit, including the mineral textures, geochemical compositions, and U-Pb ages. The mineral textures and compositions show that bastna center dot site is the primary ore mineral, while parisite and synchysite are both secondary. In situ U-Pb dating of bastna center dot site and synchysite yielded ages of 141.8 +/- 4.3 Ma (n = 41; MSWD = 0.53) and 53.3 +/- 4.4 Ma (n = 85; MSWD = 1.7), respectively. This significant interval of ages cannot be explained by continuous magmatic-hydrothermal activity. The bastna center dot site U-Pb age reflects the timing of REE mineralization in the deposit. In contrast, the synchysite U-Pb age records a later tectono-thermal event that might have been related to Eocene collision between the Indian and Eurasian plates. Our results show that REE carbonate U-Pb dating is a powerful tool for understanding the precipitation of REE minerals and, potentially, for identifying regional tectono-thermal events.
关键词	Gansha Obo REE deposit Carbonatite REE fluorocarbonates Carbonate U-Pb dating Tectono-thermal event
WOS记录号	WOS:000669449700004
收录类别	SCI
引用统计
文献类型	期刊论文
条目标识符	http://ir.gig.ac.cn/handle/344008/63345
通讯作者	Yang, Wu-Bin
作者单位	1.Chinese Acad Sci, Guangzhou Inst Geochem, Guangdong Prov Key Lab Mineral Phys & Mat, CAS Key Lab Mineral & Metallogeny, Guangzhou 510640, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.CAS Ctr Excellence Deep Earth Sci, Guangzhou 510640, Peoples R China 4.Sichuan Bur Geol & Mineral Resources, 109 Geol Brigade, Chengdu 610100, Peoples R China
推荐引用方式 GB/T 7714	Li, Ao,Yang, Wu-Bin,Niu, He-Cai,et al. Mineralogy and U-Pb geochronology of REE fluorocarbonates from the Gansha Obo REE deposit, northwest China[J]. ORE GEOLOGY REVIEWS,2021,136:9.
APA	Li, Ao,Yang, Wu-Bin,Niu, He-Cai,Shan, Qiang,&Jia, Chun.(2021).Mineralogy and U-Pb geochronology of REE fluorocarbonates from the Gansha Obo REE deposit, northwest China.ORE GEOLOGY REVIEWS,136,9.
MLA	Li, Ao,et al."Mineralogy and U-Pb geochronology of REE fluorocarbonates from the Gansha Obo REE deposit, northwest China".ORE GEOLOGY REVIEWS 136(2021):9.