微量元素在幔源矿物与热液之间分配系数的研究进展  

PROGRESS OF TRACE ELEMENTS’ PARTITIONING COEFFICIENT BETWEEN MANTLE MINERALS AND AQUEOUS FLUIDS

作　　者：陈晋阳[1] 郑海飞[2] 曾贻善[2] 

机构地区：[1]中国科学院广州地球化学研究所,广东广州510640 [2]北京大学地质学系,北京100871

出　　处：《地球科学进展》2004年第2期224-229,共6页Advances in Earth Science

基　　金：国家自然科学基金项目"地球内部几个重要界面物质的高温高压物性研究"(编号 :10 2 990 40 )资助

摘　　要：微量元素在幔源矿物与热液之间分配系数的差异是造成地幔不均一的一个重要因素 ,对于认识地球演化、元素的分异和板块构造具有重要的意义。热液的组成、矿物的结构、温度、压力以及氧逸度都与分配系数密切相关。不同微量元素在相同矿物或热液中的分配系数存在差别 ,而相同的元素在不同矿物中的分配系数也可能出现很大的变化 ,这是研究微量元素分异和不同地幔端员形成的理论基础。在较低的温度和压力下 ,热液的组成对分配系数的影响很大 ,随着温度和压力的升高 ,热液组成的影响逐渐减弱 ,而矿物的组成与结构的影响逐渐增大。由于分配系数影响因素的复杂性 。Partitioning coefficient of trace elements between mantle minerals and aqueous fluids is important to understand the evolution and tectonics of the Earth. The diversity of the compositions of mantle results from the difference of partitioning coefficients of elements. The composition of aqueous fluids, crystal structure and component of minerals, temperature, pressure, and oxygen fugacity all have effects on partitioning coefficients. Partitioning coefficients of different trace elements in a same mineral or aqueous fluid might have great difference, and which for a same element might vary with different minerals, which cause the differentiation of trace elements in the mantle and result in all kinds of geochemical characteristics mantle. The composition of aqueous fluids has great effect on partitioning coefficient at low temperatures, with increasing temperature, its effect becomes little, whereas the effect of crystal structure and component of minerals becomes important. It should be careful to research the transport and diversity of materials of mantle related with partitioning coefficient owing to these complicated factors.

关 键 词：幔源矿物 热液 微量元素 分配系数 

分 类 号：P589.1[天文地球—岩石学] P599[天文地球—地质学]