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现代地质 ›› 2025, Vol. 39 ›› Issue (04): 1039-1058.DOI: 10.19657/j.geoscience.1000-8527.2025.020

• 矿床学与岩石学 • 上一篇    下一篇

江西鹿井铀矿田小山矿床赋矿花岗岩成因及产铀潜力分析

李芙蓉1,2,3(), 潘家永1,*(), 钟福军1, 曾认宇1, 严杰1, 黄迪4, 党飞鹏4   

  1. 1.东华理工大学核资源与环境国家重点实验室,江西 南昌 330013
    2.内蒙古工业大学地质技术与岩土工程内蒙古自治区工程研究中心,内蒙古 呼和浩特 010051
    3.沙旱区地质灾害与岩土工程防御内蒙古自治区高等学校重点实验室,内蒙古 呼和浩特 010051
    4.核工业二七○研究所,江西 南昌 330200
  • 出版日期:2025-08-10 发布日期:2025-08-27
  • 通信作者: *潘家永,男,教授,博士生导师,1967年出生,主要从事矿床地球化学研究工作。Email:jypan@ecut.edu.cn
  • 作者简介:李芙蓉,女,博士研究生,1991年出生,主要从事铀矿地质研究工作。Email:furongli@ecut.edu.cn
  • 基金资助:
    国家自然科学基金项目(42362011);国家自然科学基金项目(42272090);中核铀业-核资源与环境国家重点实验室联合创新基金项目(2023NRE-LH-12);山东省高等学校青创科技支持计划项目(2024KJG073);自治区直属高校基本科研业务费项目(JY20250015)

Petrogenesis and Uranium Mineralization Potential of Granites Hosting the Xiaoshan Deposit in the Lujing Uranium Ore Field, Jiangxi Province

LI Furong1,2,3(), PAN Jiayong1,*(), ZHONG Fujun1, ZENG Renyu1, YAN Jie1, Huang Di4, DANG Feipeng4   

  1. 1. State Key Laboratory of Nuclear Resources and Environment, East China University of Technology, Nanchang 330013, Jiangxi, China
    2. Inner Mongolia Engineering Research Center of Geological Technology and Geotechnical Engineering, Inner Mongolia University of Technology, Hohhot 010051, Inner Mongolia, China
    3. Key Laboratory of Geological Hazards and Geotechnical Engineering Defense in Sandy and Drought Regions at Universities of Inner Mongolia Autonomous Region, Inner Mongolia University of Technology, Hohhot 010051, Inner Mongolia, China
    4. No.270 Research Institute of China National Nuclear Corporation, Nanchang 330200, Jiangxi, China
  • Published:2025-08-10 Online:2025-08-27

摘要:

华南是我国最重要的花岗岩型铀矿床分布区。鹿井铀矿田位于桃山—诸广铀成矿带南西侧,是华南重要的花岗岩型铀矿田之一,鹿井铀矿田中部小山矿床是近年来新探明一处中型铀矿床。小山矿床铀矿化与碱交代关系密切,矿体赋存在花岗岩中,江西小山矿床赋矿花岗岩的研究为华南印支期花岗岩成因及其铀成矿专属性研究提供了关键地质证据。为此,本文选取小山铀矿床赋矿花岗岩为研究对象,通过详细的岩相学观察和地球化学分析,探讨花岗岩的成因、构造背景及其对铀成矿的制约。研究发现,小山矿床赋矿花岗岩主要由中粗粒似斑状黑云母花岗岩和细粒二云母花岗岩组成,锆石U-Pb 年龄分别为237.3±1.5 Ma和236.8±1.6 Ma,为印支早期岩浆作用产物。岩相学、地球化学及锆石 Hf 同位素特征表明,赋矿花岗岩具有 S 型花岗岩的特征,形成于挤压向伸展转换的构造背景,其源区主要为古元古代变泥质岩,系地壳物质部分熔融作用的产物。小山矿床的两类花岗岩均富铀,是区内铀成矿的重要铀源岩。

关键词: 花岗岩型铀矿, 锆石 U-Pb定年, Hf同位素, 岩石成因, 鹿井矿田, 小山矿床

Abstract:

The South China Block is a significant region for granite-type uranium deposits in China. The Lujing uranium ore field, located on the southwest side of the Taoshan-Zhuguang uranium metallogenic belt, is one of the most important granite-type uranium ore fields in South China. In recent years, the Xiaoshan deposit, a medium-sized uranium deposit, has been newly discovered in the central part of the Lujing uranium ore field. Uranium mineralization in the Xiaoshan deposit is closely related to alkaline metasomatism, with ore bodies hosted in granite. The study of ore-hosting granites in the Xiaoshan deposit, Jiangxi Province, provides key geological evidence for understanding the genesis of Indosinian granites and their uranium metallogenic specialization in South China. For this purpose, this study focuses on the ore-hosting granites of the Xiaoshan uranium deposit. By conducting detailed petrographic observations and geochemical analyses, it explores the genesis, tectonic setting of the granites, and their constraints on uranium mineralization. The research reveals that the ore-hosting granites in the Xiaoshan deposit mainly consist of medium-coarse-grained porphyritic biotite granite and fine-grained two-mica granite, with zircon U-Pb ages of 237.3±1.5 Ma and 236.8±1.6 Ma, respectively, indicating that they are the products of early Indosinian magmatism. Petrographic, geochemical, and zircon Hf isotopic characteristics show that the ore-hosting granites have features of S-type granites, formed in a tectonic setting transitioning from compression to extension. Their source area is mainly Paleoproterozoic metamudstone, resulting from partial melting of crustal materials. Both types of granites in the Xiaoshan deposit are uranium-rich and serve as important uranium source rocks for uranium mineralization in the region.

Key words: Granite-type uranium deposit, zircon U-Pb dating, Hf isotope, petrogenesis, Lujing uranium ore field, Xiaoshan deposit

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