缅甸曼排钨矿床元素地球化学特征

Elemental Geochemistry of the Manpai Tungsten Deposit,Myanmar

采用ICP-MS和ICP-OES分析了缅甸曼排钨矿床的花岗岩、云英岩和石英的微量元素和稀土元素组成。在对所获数据进行标准化处理和相关分析的基础上,将其与钨矿化地质特征进行综合分析研究,认为该区花岗岩体只形成钨矿床,而没有形成钨-锡矿床或锡-钨矿床的原因,很可能是在岩浆期后的气液作用过程中,W、Sn发生了矿化分离。W、Sn发生矿化分离的原因,除了与W、Sn元素的地球化学行为有关外,还与成矿热液系统的物质组成和富氧低硫的特性有关。

The Manpai tungsten deposit is a large tungsten deposit in Myanmar. Contents of REE and trace elements of the granite rocks,greisen and hydrothermal quartz of the Manpai tungsten deposit in Myanmar have been measured by using ICP-MS and ICP-OES respectively. On the basis of the normalization and correlation analysis of the obtained data,a comprehensive analysis on the relationship between the elemental geochemical characteristics and the geological characteristics of the tungsten deposit has been given in this paper. It is believed that the only tungsten mineralization rather than the tungsten-tin or tin-tungsten mineralization occurred in the granitecould be caused by the differentiation oftungsten and tinin hydrothermal fluid derived from granitic magma in late stage. The differentiation of tungsten and tin could be associated with not only their geochemical behaviors,but also compositions and properties of sulfur-poor and oxygen-richof the hydrothermal system.