粤北下庄花岗岩中晶质铀矿成分特征及其铀成矿指示
作者:
  • 朱京京

    朱京京

    合肥工业大学资源与环境工程学院, 合肥工业大学矿床成因与勘查技术研究中心, 安徽 合肥 230009;安徽省 矿产资源与矿山环境工程研究中心, 安徽 合肥 230009;安徽省战略性矿产资源深部探测与评价利用重点实验室 (合肥工业大学), 安徽 合肥 230009
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  • 张龙

    张龙

    合肥工业大学资源与环境工程学院, 合肥工业大学矿床成因与勘查技术研究中心, 安徽 合肥 230009;安徽省 矿产资源与矿山环境工程研究中心, 安徽 合肥 230009;安徽省战略性矿产资源深部探测与评价利用重点实验室 (合肥工业大学), 安徽 合肥 230009
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  • 汪方跃

    汪方跃

    合肥工业大学资源与环境工程学院, 合肥工业大学矿床成因与勘查技术研究中心, 安徽 合肥 230009;安徽省 矿产资源与矿山环境工程研究中心, 安徽 合肥 230009;安徽省战略性矿产资源深部探测与评价利用重点实验室 (合肥工业大学), 安徽 合肥 230009
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  • 陈振宇

    陈振宇

    中国地质科学院矿产资源研究所, 自然资源部成矿作用与资源评价重点 实验室, 北京 100037
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中图分类号:

P619.14;P588.12+1

基金项目:

国家自然科学基金项目(42272074,42002077);中央高校基本科研业务费专项资金(PA2024GDSK0160,JZ2022HGTB0301)


Composition characteristics of uraninite in Xiazhuang granite of northern Guangdong: Implications for uranium mineralization
Author:
  • ZHU Jing-jing

    ZHU Jing-jing

    School of Resources and Environmental Engineering, Ore Deposit and Exploration Centre, Hefei University of Technology, Hefei 230009, China;Anhui Province Engineering Research Center for Mineral Resources and Mine Environments, Hefei 230009, China;Anhui Provincial Key Laboratory for Deep Exploration, Evaluation and Utilization of Strategic Mineral Resources (Hefei University of Technology), Hefei 230009, China
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  • ZHANG Long

    ZHANG Long

    School of Resources and Environmental Engineering, Ore Deposit and Exploration Centre, Hefei University of Technology, Hefei 230009, China;Anhui Province Engineering Research Center for Mineral Resources and Mine Environments, Hefei 230009, China;Anhui Provincial Key Laboratory for Deep Exploration, Evaluation and Utilization of Strategic Mineral Resources (Hefei University of Technology), Hefei 230009, China
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  • WANG Fang-yue

    WANG Fang-yue

    School of Resources and Environmental Engineering, Ore Deposit and Exploration Centre, Hefei University of Technology, Hefei 230009, China;Anhui Province Engineering Research Center for Mineral Resources and Mine Environments, Hefei 230009, China;Anhui Provincial Key Laboratory for Deep Exploration, Evaluation and Utilization of Strategic Mineral Resources (Hefei University of Technology), Hefei 230009, China
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  • CHEN Zhen-yu

    CHEN Zhen-yu

    MNR Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China
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    摘要:

    晶质铀矿是产铀花岗岩的标型矿物,是形成花岗岩型铀矿床最重要的铀源矿物,理解其成分特征与结晶年龄对揭示铀成矿过程具有重要意义。粤北下庄铀矿田是我国重要的花岗岩型铀矿床产地,本文利用电子探针对该矿田的下庄花岗岩和石土岭铀矿床近矿蚀变花岗岩中的晶质铀矿开展了结构特征和化学年龄研究。结果表明,下庄花岗岩中晶质铀矿(Urn-1)主要以矿物包体形式赋存于造岩矿物中;而石土岭铀矿床近矿花岗岩中晶质铀矿(Urn-2)主要与黄铁矿共生,位于造岩矿物之间。Urn-1和Urn-2的化学年龄分别为233±3 Ma与156±2 Ma。前者与下庄岩体的锆石U-Pb年龄一致,指示Urn-1为岩浆结晶成因。近矿花岗岩发育白云母化和绿泥石化,对应石土岭矿床的铀成矿早期阶段。这些蚀变花岗岩具有较高的U含量(55.5×10-6~118×10-6)和较低的Th/U值(0.15~0.35),表明这些样品受到了富铀流体的影响,Urn-2从该流体中结晶,为热液成因。Urn-2的化学年龄进一步约束石土岭铀矿床的铀成矿时代为晚侏罗世。下庄岩体中一些晶质铀矿颗粒发生了蚀变,其蚀变区域的UO2含量为33.83%~56.01%,明显低于未蚀变区域(UO2 = 86.21%~95.91%),这可能指示了流体作用下的铀活化迁移与成矿作用。

    Abstract:

    Uraninite is a typical mineral of uranium-bearing granite and the most important source mineral of uranium for the formation of granite-related uranium deposits. Understanding its compositional characteristics and crystallization age is significant for revealing the uranium mineralization process. The Xiazhuang uranium ore field in northern Guangdong is an important granite-related uranium deposit in China. In this study, textures and chemical ages of uraninite from the Xiazhuang granite and the altered granite at the Shituling uranium deposit were investigated using EPMA. The results indicate that uraninite in the Xiazhuang granite (Urn-1) is enclosed in rock-forming minerals, and the uraninite near the ore granite of the Shituling uranium deposit (Urn-2) is intergrown with pyrite and occurs between rock-forming minerals. EPMA data yielded the chemical ages of 233±3 Ma and 156±2 Ma for Urn-1 and Urn-2, respectively. The former is consistent with the zircon U-Pb age of the Xiazhuang granite, indicating that Urn-1 is of magmatic origin. Hydrothermal alteration of the altered granite mainly includes muscovitization and chloritization, corresponding to the early stage of uranium mineralization of the Shituling deposit. These altered samples have higher whole-rock U contents (55.5×10-6~118×10-6) and lower Th/U ratios (0.15~0.35) relative to the fresh rocks, indicating that these samples were influenced by uranium-rich fluids, and Urn-2 crystallized from that fluid, suggesting a hydrothermal origin. The chemical age of Urn-2 further indicates that uranium mineralization of the Shituling uranium deposit took place at the Late Jurassic. Some uraninites have been altered, and UO2 contents of the altered domains are 33.83%~56.01%, obviously lower than the unaltered domains (UO2=86.21%~95.91%), which may suggest the mobilization and mineralization of uranium related to hydrothermal activity.

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朱京京,张龙,汪方跃,等, 2025. 粤北下庄花岗岩中晶质铀矿成分特征及其铀成矿指示[J]. 岩石矿物学杂志, 44(1):113~127.
ZHU Jing-jing, ZHANG Long, WANG Fang-yue, et al, 2025. Composition characteristics of uraninite in Xiazhuang granite of northern Guangdong: Implications for uranium mineralization[J]. Acta Petrologica et Mineralogica, 44(1): 113~127.

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  • 收稿日期:2023-07-10
  • 最后修改日期:2024-04-15
  • 在线发布日期: 2025-01-15
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