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Mineralization age of the Xiangshan uranium ore field, South China redefined by hydrothermal apatite U-Pb geochronology

文献类型：期刊论文

作者Wang, Yongjian3,4,5; Fan, Honghai3; Qin, Kezhang4,5; Evans, Noreen J.2; Zhang, Chuang3; Zou, Xinyu4,5; Pang, Yaqing3; Zhang, Han1
刊名ORE GEOLOGY REVIEWS
出版日期2023-09-01
卷号160页码:29
ISSN号0169-1368
关键词Apatite U-Pb dating Zircon U-Pb dating Mineralization age Xiangshan volcanic-related uranium ore field South China
DOI10.1016/j.oregeorev.2023.105586
英文摘要The Xiangshan volcanic-related uranium ore field, located in the Ganzhou-Hangzhou Uranium-Polymetallic Metallogenic Belt (GHMB) in South China, has been the country's largest historic uranium producer. Although this ore field has been intensely studied for decades, the absolute age of uranium ore formation was still debated. Conventional U-Pb dates on U-minerals (i.e., pitchblende, brannerite) and Ar-Ar dates on associated alteration minerals (i.e., illite) from different uranium deposits yield a wide range of ages (122 to 85 Ma). The uncertainty regarding the exact timing of uranium mineralization at Xiangshan has limited the development of accurate ore genesis models and precluded a better understanding of the links between metallogenesis and regional-scale geodynamics during the Cretaceous-Tertiary period in South China. In this work, we focus on applying in-situ LA-ICP-MS U-Pb geochronology to magmatic and hydrothermal apatite from two typical uranium ore deposits at Xiangshan, intending to indirectly constrain the exact timing of uranium mineralization and reconstruct the magmatic-hydrothermal history. U-Pb age determinations on magmatic zircon and apatite from the three types of ore-hosting volcanic rocks yielded precise crystallization ages of 133 to 136 Ma and 135 to 140 Ma, respectively. These results are identical within uncertainty to previously reported U-Pb dates obtained in the study area, and thereby tightly constrain the emplacement age of the Xiangshan volcanic complex that hosts uranium deposits. Moreover, the potassium feldspar-biotite Ar-Ar dating for the major volcanic rocks demonstrates that these host rocks were cooled and completely solidified through the biotite/potassium feldspar closure temperature (below 300 C) at 133-131 Ma. Subhedral or anhedral aggregates of hydrothermal apatite ubiquitously formed in the high-grade uranium ores at the Shannan and Zoujiashan deposits and are commonly intergrown with fluorite, illite and uranium minerals. Relative to magmatic apatite from the host rocks, the hydrothermal apatite is typically characterized by much higher U and Th contents, depletion of LREEs, enrichment in HREEs and a much more pronounced negative Eu anomaly. As such, the hydrothermal apatite is unequivocal of hydrothermal origin and formed synchronously with uranium mineralization. LA-ICP-MS U-Pb dating of these hydrothermal apatite crystals yielded an absolute 206Pb/238U age of 126.7 & PLUSMN; 0.6 Ma for the Shannan deposit and 131.3 & PLUSMN; 7.2 Ma for the Zoujiashan deposit. The new ages are much older (>10 Ma) than those previously reported ages on ore or gangue minerals such as pitchblende and illite. Thus, one unidentified mineralization event likely occurred at ca. 131-127 Ma, soon after solidification and subsequent brittle deformation or faulting within the volcanic caldera. We, therefore, proposed that volcanic magmatism was highly likely to be the 'heat engine' driving hydrothermal fluid convection and possibly provide the essential conditions (i.e., magmatic fluids, U sources) for the formation of the U mineralization. Another implication of this study is that dating hydrothermal apatite with high U concentrations associated with uranium mineralization could be considered a complementary geochronological tool in the study of analogous hydro thermal uranium deposits worldwide.
WOS关键词LA-ICP-MS ; TRACE-ELEMENT COMPOSITIONS ; ISOTOPE GEOCHEMISTRY ; VOLCANIC COMPLEX ; NORTH CHINA ; DEPOSIT ; BEARING ; PETROGENESIS ; CONSTRAINTS ; EVOLUTION
资助项目Nuclear Materials of China Atomic Energy Authority[ICNM-2023-ZH-19] ; National Natural Science Foundation, China[41772082] ; Key Project of the Ministry of Science and Technology, China[2017YFC0602600]
WOS研究方向Geology ; Mineralogy ; Mining & Mineral Processing
语种英语
出版者ELSEVIER
WOS记录号WOS:001068025300001
资助机构Nuclear Materials of China Atomic Energy Authority ; Nuclear Materials of China Atomic Energy Authority ; Nuclear Materials of China Atomic Energy Authority ; Nuclear Materials of China Atomic Energy Authority ; National Natural Science Foundation, China ; National Natural Science Foundation, China ; National Natural Science Foundation, China ; National Natural Science Foundation, China ; Key Project of the Ministry of Science and Technology, China ; Key Project of the Ministry of Science and Technology, China ; Key Project of the Ministry of Science and Technology, China ; Key Project of the Ministry of Science and Technology, China ; Nuclear Materials of China Atomic Energy Authority ; Nuclear Materials of China Atomic Energy Authority ; Nuclear Materials of China Atomic Energy Authority ; Nuclear Materials of China Atomic Energy Authority ; National Natural Science Foundation, China ; National Natural Science Foundation, China ; National Natural Science Foundation, China ; National Natural Science Foundation, China ; Key Project of the Ministry of Science and Technology, China ; Key Project of the Ministry of Science and Technology, China ; Key Project of the Ministry of Science and Technology, China ; Key Project of the Ministry of Science and Technology, China ; Nuclear Materials of China Atomic Energy Authority ; Nuclear Materials of China Atomic Energy Authority ; Nuclear Materials of China Atomic Energy Authority ; Nuclear Materials of China Atomic Energy Authority ; National Natural Science Foundation, China ; National Natural Science Foundation, China ; National Natural Science Foundation, China ; National Natural Science Foundation, China ; Key Project of the Ministry of Science and Technology, China ; Key Project of the Ministry of Science and Technology, China ; Key Project of the Ministry of Science and Technology, China ; Key Project of the Ministry of Science and Technology, China ; Nuclear Materials of China Atomic Energy Authority ; Nuclear Materials of China Atomic Energy Authority ; Nuclear Materials of China Atomic Energy Authority ; Nuclear Materials of China Atomic Energy Authority ; National Natural Science Foundation, China ; National Natural Science Foundation, China ; National Natural Science Foundation, China ; National Natural Science Foundation, China ; Key Project of the Ministry of Science and Technology, China ; Key Project of the Ministry of Science and Technology, China ; Key Project of the Ministry of Science and Technology, China ; Key Project of the Ministry of Science and Technology, China
源URL[http://ir.iggcas.ac.cn/handle/132A11/110862]  
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Qin, Kezhang
作者单位1.Yanduzhongshi Geol Anal Labs Ltd, Beijing 100094, Peoples R China
2.Curtin Univ, Sch Earth & Planetary Sci, John Laeter Ctr, Perth, WA 6845, Australia
3.China Natl Nucl Cooperat, Beijing Res Inst Uranium Geol, Beijing 100029, Peoples R China
4.Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100029, Peoples R China
5.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, Beijing 100049, Peoples R China
推荐引用方式
GB/T 7714		 Wang, Yongjian,Fan, Honghai,Qin, Kezhang,et al. Mineralization age of the Xiangshan uranium ore field, South China redefined by hydrothermal apatite U-Pb geochronology[J]. ORE GEOLOGY REVIEWS,2023,160:29.
APA Wang, Yongjian.,Fan, Honghai.,Qin, Kezhang.,Evans, Noreen J..,Zhang, Chuang.,...&Zhang, Han.(2023).Mineralization age of the Xiangshan uranium ore field, South China redefined by hydrothermal apatite U-Pb geochronology.ORE GEOLOGY REVIEWS,160,29.
MLA Wang, Yongjian,et al."Mineralization age of the Xiangshan uranium ore field, South China redefined by hydrothermal apatite U-Pb geochronology".ORE GEOLOGY REVIEWS 160(2023):29.

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