In-Situ U-Pb Age and Elemental Characteristics of Pitchblende in Shulouqiu Uranium Deposit and Its Geological Significance

被引：0
|
作者：
Zheng G. [1 ]
Luo Q. [1 ]
Liu W. [1 ]
Jiang W. [1 ]
Liu B. [1 ]
Zhong F. [2 ]
机构：
[1] No. 290 Research Institute, China National Nuclear Corporation, Shaoguan
[2] State Key Laboratory of Nuclear Resources and Environment, East China University of Technology, Nanchang
来源：
Diqiu Kexue - Zhongguo Dizhi Daxue Xuebao/Earth Science - Journal of China University of Geosciences | 2021年 / 46卷 / 06期
关键词：
intersection type" uranium mineralization; Elemental analysis; LA-ICP-MS in-situ analysis; Shulouqiu uranium deposit; U-Pb dating;
D O I：
10.3799/dqkx.2020.225
中图分类号：
学科分类号：
摘要：
In order to penetrate into discussion the "intersection type" uranium mineralization in the Changjiang uranium ore field, South China. Here, it collected representative samples from geological structure that formed during the process of mafic dick penetrating silicified surrounding rock and then carried out a study applying in-situ U-Pb dating and elementary analysis via LA-ICP-MS system. Results show that the weighting average age of pitchblende in this region is 71.3±1.1 Ma. Besides, trace elements are characterized by the enrichment of sulfophilic elements (such as W, Bi, and Mo) and by the depletion of high field strength elements (like Nb, Ta, Zr, Hf, and Th). The signature of rare earth element (REE) curve shows low total amount with negative Eu anomalies, slight enrichment in light REE, and indistinct fractionation between light and heavy REEs. The uranium source of pitchblende probably relates to the Changjiang granite, as indicated by a REE pattern comparison between them. In addition, the pitchblende was formed under low-temperature and low-middle salinity condition. This is validated through a combination of ΣREE-(U/Th) plot, ΣREE-(LREE/HREE)N plot, and comparison against REE distribution pattern in vein-type uranium deposits. Moreover, δCe value indicates reducing environment. In this region, the pitchblende was controlled by the interplay among Nanxiong fault (during 80-60 Ma), uranium-rich Changjiang granite, and mafic dyke, therefore forming the "intersection type" uranium mineralization in the active region. © 2021, Editorial Department of Earth Science. All right reserved.
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页码：2172 / 2187
页数：15
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