南岭中段黄沙矿区223铀矿床绿泥石特征与铀成矿关系

发布时间：2018-04-30 14:19

  本文选题：铀矿床 + 绿泥石　； 参考：《矿物学报》2017年06期

【摘要】：绿泥石化是华南热液铀矿床重要的蚀变类型之一。本文通过对南岭中段黄沙矿区223铀矿床绿泥石的岩相学和电子探针成分分析,区分出4种产出状态的绿泥石,识别了绿泥石的化学成分类型,计算了绿泥石的形成温度、n(Mg)/n(Fe+Mg)等相关指数,讨论了绿泥石形成机制环境及其与铀成矿的关系。研究表明223铀矿床绿泥石主要分为黑云母蚀变型、长石蚀变型、裂隙充填型和铀矿共生型4种产出类型,为富铁的蠕绿泥石,形成于还原环境,形成温度为200~282℃,属于中温热液蚀变;绿泥石的形成机制主要有溶蚀-沉淀结晶和溶蚀-迁移-沉淀结晶2种方式。绿泥石化改变了岩石物理-力学性质、原岩中铀的赋存状态,提供了成矿热液部分铀源和有利于铀富集成矿的地球化学环境。
[Abstract]:Green mud petrifaction is one of the important alteration types of hydrothermal uranium deposits in South China. Based on the analysis of lithofacies and electron probe composition of chlorite in Huangsha deposit 223 uranium deposit in the middle part of Nanling, four kinds of chlorite are distinguished, and the chemical composition types of chlorite are identified. The formation temperature of chlorite is calculated and the relationship between the formation mechanism of chlorite and uranium mineralization is discussed. The results show that the chlorite of No. 223 uranium deposit is mainly divided into biotite alteration type, feldspar alteration type, fissure filling type and uranium ore symbiotic type, which are iron-rich vermicular chlorite, formed in the reduction environment and formed at 200 ~ 282 鈩，

本文编号：1824892