期刊论文

Constraints of Uranium Ore-forming Fluids from Geochemical Characteristics of Zircon:an Example from Mianhuakeng U deposits in North Guangdong Province,China

中文

南华大学学报(自然科学版)

1673-0062

2019

33

4

19-26

10.19431/j.cnki.1673-0062.2019.04.003

国防基础科研计划项目（B3720110004）；

本校为第一机构

铀矿中锆石富集Li、P、Ti、Nb、Hf、U、Th、Ta、Y、Rare earth elements(REE)等微量元素,Th/U比值较低,在以大陆上地壳为标准化的模式图上呈现明显的重稀土富集、Ce、Y正异常和Eu负异常的特征。根据锆石/热液间微量元素的分配系数估算了成矿流体的微量元素质量分数。铀成矿流体具有富U,低Th/U比值,高稀土元素质量分数,轻、重稀土分异不明显,显著的Ce、Eu负异常和Y正异常,低Ce^4+/Ce^3+比值等特征。成矿流体主要来源于岩浆期后热液,并得到流体/岩石反应的改造,流体上升减压导致流体沸腾、气体溢出、碱性增高和还原环境,最终导致铀矿物的沉淀和铀矿床的形成。

Zircons in uranium ore deposit studied are enriched in trace elements(exempli gratia:Li,P,Ti,Nb,Hf,U,Th,Ta,Y,Rare earth elements(REE)),but have low Th/U ratios.In addition,in the model diagrams of the trace elements normalized by the upper continental crust,the zircons show obvious enrichment of heavy rare earth elements,positive anomalies of Ce and Y,and negative anomaly of Eu.Based on the distribution coefficients of trace elements between zircon and hydrothermal solutions,the contents of trace elements in metallogenic fluids were estimated.The uranium metallogenic fluids have the characteri...