广西越城岭地区香炉山铷矿矿石特征及铷的赋存状态研究

Study of ore characteristics and occurrence state of rubidium in Xianglushan deposit in Yuechengling area of Guangxi

铷(Rb)是稀有金属,其资源分布特征和开发利用一直是国内外重点关注对象。本文以广西越城岭地区香炉山铷矿床为研究对象,利用化学分析、光学显微镜鉴定、TIMA以及LA-ICP-MS等微区分析手段查明了矿床中不同类型矿石的矿物组成和化学成分特征,并在此基础上,对不同类型矿石的物质组成特征及其中铷的赋存状态进行了详细研究。研究结果表明,香炉山矿石中含铷矿物为白云母、钾长石和斜长石,其中Rb含量由高到低为白云母>钾长石>斜长石,钾长石是Rb的主要载体矿物,Rb在钾长石中不均匀分布;二长花岗岩和中细粒二长岩的钾长石中Rb占比均大于80%,表明香炉山铷矿床属于长石型铷资源。

Rubidium metal is a kind of rare metal which has been paid much attention at China and abroad in the distribution of resources and the exploitation and utilization.Based on chemical analysis,optical microscopy,TIMA and LA-ICP-MS,the composition of different types of rubidium ores and the occurrence state of rubidium in Xianglushan deposit in Yuechengling area of Guangxi are studied in detail.The result shows that the rubidium-containing minerals in Xianglushan ore are muscovite,potassium feldspar and plagioclase,in which the content of Rb is Muscovite>potassium feldspar>plagioclase from the high to low.Potassium feldspar is the main carrier mineral of Rb,Rb is not uniformly distributed in feldspar.Rb ratio of potassium feldspar in monzonitic granite and medium-fine monzonite is more than 80%,indicating that Xianglushan Rb deposit belongs to feldspar type Rb resources.The proportion of Rb in monzonitic granite medium and medium-fine monzonite is 88.1%、80.5%and 96.4%,respectively,which indicates that the rubidium resource type in Xianglushan deposit belongs to feldspar type.