地质学报2025，Vol.99Issue(5)：1656-1675,20.DOI:10.19762/j.cnki.dizhixuebao.2023386
粤北下庄花岗岩体岩石成因与铀成矿关系:锆石微量元素和矿物化学的约束
Petrogenesis of granites and its relationship with uranium mineralization in the Xiazhuang pluton,northern Guangdong Province:Constraints from zircon trace element and mineral chemistry
摘要
Abstract
The granite-hosted uranium deposits in South China are spatially associated with U-rich granites(U＞10×10-6).Understanding the petrogenesis of these uranium-bearing granites,with high U contents,is significant not only for formulating exploration strategies but also for gaining better insights into the mechanisms of U enrichment and mineralization.Here,we investigate the Xiazhuang granites,a representative suite of U-bearing granites with high U contents,using zircon U-Pb dating,zircon trace elementanalysis,and biotite and chlorite geochemistry to constrain their petrogenesis and relationship with uranium mineralization.LA-ICP-MS zircon U-Pb dating shows that the Xiazhuang granites were emplaced between 236 and 234 Ma.Their parental magmas were derived from the partial melting of F-rich Paleoproterozoic metasedimentary rocks and subsequently underwent a relatively high degree of magmatic differentiation.During magmatic evolution,oxygen fugacity decreased while U contents increased,leading to the formation of U-rich granites(U＞10×10-6)containing abundant U-rich accessory minerals such as uraninite,monazite,xenotime,and thorite.Our study suggests that these primary U-rich accessory minerals were later altered by hydrothermal fluids under relatively acidic and oxidizing conditions,likely in response to Yanshanian mafic magmatism.This alteration facilitated uranium leaching,providing a source for subsequent uranium mineralization.关键词
富U花岗岩/花岗岩型铀矿床/锆石微量元素/矿物地球化学/下庄花岗岩Key words
U-rich granite/granite-hosted uranium deposit/zircon trace elements/mineral geochemistry/Xiazhuang granites引用本文复制引用
陶继华,杨跃贵,张泽凤,任志,徐志添,孙俊杰,曹俊,苏献源,冷成彪,许德如..粤北下庄花岗岩体岩石成因与铀成矿关系:锆石微量元素和矿物化学的约束[J].地质学报,2025,99(5):1656-1675,20.基金项目
本文为国家自然科学基金项目(编号41963002,42063001)和东华理工大学-中国铀业有限公司联合基金项目(编号2022NRE-LH-19)联合资助的成果. （编号41963002,42063001）
