粤北下庄花岗岩体岩石成因及与铀成矿关系:锆石微量元素和矿物化学的约束
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1.东华理工大学 地球科学学院;2.东华理工大学 核资源与环境国家重点实验室;3.自然资源部华南花岗岩型铀矿野外科学观测研究站;4.广东省核工业地质局二九三大队

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(编号41963002,42063001)、东华理工大学-中国铀业有限公司联合基金(批准号:2022NRE-LH-19)联合资助的成果。


Petrogenesis of granites and its relationship with uranium mineralization in the Xiazhuang pluton, northern Guangdong Province: Constraints from zircon trace element and mineral chemistry
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1.School of Earth Sciences,East China University of Technology;2.State Key Laboratory of Nuclear Resources and Environment, East China University of Technology;3.Observation and Research Station of Granite-type U Deposit in South China;4.Guangdong Province Nuclear Industry Geological Bureau 293 Brigade;5.tate Key Laboratory of Nuclear Resources and Environment,East China University of Technology

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    摘要:

    华南花岗岩型铀矿床常常与U含量大于10×10-6的富U花岗岩在空间上紧密共生,了解这些富U产铀花岗岩的岩石成因有助于铀矿找矿勘探和铀成矿理论研究。本文以下庄富U产铀花岗岩为研究对象,开展系统的锆石U-Pb年代学和锆石微量元素特征,以及黑云母和绿泥石矿物化学成分特征研究。结果显示,下庄花岗岩形成年龄为234~236 Ma。下庄花岗岩来自古元古代沉积岩部分熔融,熔体具有高F含量特征,并经历了较高程度的分离结晶作用,随着岩浆演化,氧逸度逐渐降低,U元素不断富集,并最终形成了含大量晶质铀矿、独居石、磷钇矿和钍石等富U副矿物的富U(>10×10-6)花岗岩。受燕山期基性岩浆作用形成的相对酸性和低度氧化性热液流体影响,下庄花岗岩中富U副矿物的U元素被大量萃取,成为铀矿化作用的重要成矿物质来源。

    Abstract:

    The granite-hosted uranium deposits in South China are spatially associated with the U-rich granites (U﹥10×10-6). Understanting the petrogenesis of these uranium-bearing granites with high U contents is not only significant for formulating exploration strategies for granite-hosted uranium deposits in South China, but also for ta better insights into the mechanism of U enrichment and mineralization for the granite-hosted uranium deposits. Here we investigate the Xiazhuang garnites which represent typical U-bearing granites with high U contents, using zircon U-Pb dating and zircon trace elements, biotite and chlorite geochemistry data, to constrain the petrogenesis and its relationship with uranium mineralization. LA-ICP-MS zircon U-Pb dating shows that the Xiazhuang granites were emplaced 234~236 Ma. The parental magmas of Xiazhuang granites were derived from the partial melting of Paleoproterozoic metasedimentary rocks with high F contents, and then underwent relative highly degree of magma differentiation. The oxygen fugacity decreased and U contents increased with the magmatic evolution, which led to the formation of U-rich granites (U﹥10 ×10-6) containing a large amount of U-rich accessory mineral such as uraninite, monazite, xenotime and thorite. Our study suggests that the U-rich accessory minerals in Xiazhuang granites were altered by the hydrothermal fluids in relatively acidic and oxidizing conditions in response to the Yanshanian mafic magmatism, followed by uranium leaching during alteration and provided uranium sources for the uranium mineralization.

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  • 收稿日期:2023-09-05
  • 最后修改日期:2023-12-11
  • 录用日期:2024-02-25
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