粤北长江铀矿田成矿过程中稀土元素地球化学特征

发布时间：2018-08-25 12:23

【摘要】：对粤北长江铀矿田赋矿花岗岩、蚀变花岗岩、铀矿石、沥青铀矿、黄铁矿、方解石和萤石开展了系统的REE,U与Th的地球化学研究,结果显示各类样品表现出类似的LREE相对富集、HREE相对亏损和Eu负异常的地球化学特征,表明样品REE特征具有一定的继承性,继承了赋矿花岗岩的REE特征。成矿早期钠交代作用对花岗岩中REE迁移较小,但对U有预富集作用,成矿期热液蚀变对花岗岩中REE迁移较明显,尤其是HREE,而Th表现出相对稳定的特征。从成矿早期到晚期方解石ΣREE逐渐降低(ΣREE平均值由48.86×10~(-6)→43.52×10~(-6)→28.40×10~(-6)),Eu负异常趋于减弱(δEu均值由0.23→0.31→0.39),表明成矿流体向相对氧化环境演化。成矿热液中REE,U与Th活化、迁移具同步性和同时性。热液沸腾和去气作用是造成沥青铀矿、方解石和萤石相对富集HREE的原因。由成矿早期到成矿晚期,成矿热液向相对氧化的酸性流体演化。
[Abstract]:A systematic REE,U and Th geochemical study of granites, altered granites, uranium ores, asphaltene uranium deposits, pyrite, calcite and fluorite has been carried out on the Yangtze River uranium deposit in northern Guangdong Province. The results show that the samples exhibit similar geochemical characteristics of LREE relative enrichment hree depletion and Eu negative anomaly, indicating that the REE characteristics of the samples are inherited to some extent and inherited the REE characteristics of ore-bearing granite. Sodium metasomatism in the early stage of mineralization has little effect on REE migration in granite, but preenrichment on U, and hydrothermal alteration during metallogenic period is more obvious for REE migration in granite, especially HREE, and Th show relatively stable characteristics. The 危 REE of calcite gradually decreased from the early metallogenic stage to the late stage (the mean value of 危 REE decreased from 48.86 脳 10 ~ (-6) ~ (-6) ~ (43.52) 脳 10 ~ (-6) ~ (-6) ~ (28.40 脳 10 ~ (-6) ~ (28. 40) 脳 10 ~ (-6) ~ (-6) to a negative anomaly (未 Eu = 0.23 ~ 0.31 ~ (0.39), indicating that the ore-forming fluid evolved into a relatively oxidizing environment. REE,U and Th are activated in mineralizing hydrothermal solution, and the migration is synchronous and simultaneous. Hydrothermal boiling and degassing are responsible for the relative enrichment of HREE in asphaltene uranium, calcite and fluorite. From the early metallogenic stage to the late metallogenic stage, the ore-forming hydrothermal fluid evolves to the acidic fluid of relative oxidation.
【作者单位】： 东华理工大学核资源与环境国家重点实验室培养基地;核工业290研究所;
【基金】：国家自然基金项目(U1403292) 中国地质调查局项目(12120115035601) 省部共建核资源与环境国家重点实验室培育基地自主基金项目(Z1608) 江西省研究生创新项目(YC2016-B074)
【分类号】：P595;P619.14

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