磷在金属相和硅酸盐熔体间分配系数的研究进展  

Progress of Research on Phosphorus Partition Coefficient between Metal and Silicate Melts

作　　者：尹远[1,2] 薛卫红 翟双猛[1] YIN Yuan;XUE Wei-hong;ZHAI Shuang-meng(Key Laboratory of High-temperature and High-pressure Study of the Earth's Interior,Institute of Geochemistry,Chinese Academy of Sciences,Guiyang 550081,China;University of Chinese Academy of Sciences,Belting 100049,China)

机构地区：[1]中国科学院地球化学研究所,地球内部物质高温高压院重点实验室,贵阳550081 [2]中国科学院大学,北京100049

出　　处：《矿物岩石地球化学通报》2018年第5期989-998,共10页Bulletin of Mineralogy, Petrology and Geochemistry

基　　金：国家自然科学基金项目(41372040)

摘　　要：通过磷在金属相和硅酸盐熔体间的分异情况可以限定行星核幔分异时的温度、压力、氧逸度等物理化学条件。本文综述了磷在金属相和硅酸盐熔体间分配过程的两个基本模型,总结了不同物理化学条件对磷在金属相和硅酸盐熔体间分配系数(Dp^met/sil)的影响。通常,Dp^met/sil会随氧逸度的增加而明显减小,随温度升高而增大,随压力升高而减小,随硅酸盐熔体组分的变化可达三个数量级,随着金属相中硫和碳的含量增多而减小。现有的实验研究主要基于地球的硅酸盐组分和低压力条件,将磷的分配系数模型应用到更多的类地行星核幔分异过程中,还需要更多组分、更高温压条件下的实验结果。Based on partition coefficient experiments,the differentiation behavior of phosphorus between metal and silicate melts could be applied to constrain P-T-fo2 conditions of the core-mantle differentiation.This article has reviewed two basic geochemical models of phosphorus partition coefficient between metal and silicate melts,and summarized the effects of various physicochemical conditions on the phosphorus partition coefficient between metal and silicate melts (DPmet/sil).Generally,DPmet/sil values are obviously decreased with the increase of oxygen fugacity,and sulfur and carbon concentrations of the metal phase,and are weakly decreased with the increase of pressure,but are increased with the increase of temperature.Especially,the variation of silicate melt components could lead to three orders of magnitude changes of the partition coefficient.It is believed that more results of further experimental studies on the phosphorus partition coefficient between metal and silicate melts under conditions of different representative silicate components and higher pressures and temperatures are required for establishing a model applying suitably to explain the core-mantle differentiation of many more terrestrial planets,as the previous experimental studies are limitedly undertaken on the basis of bulk silicate compositions of the Earth under low pressures.

关 键 词：磷 分配系数 金属相 硅酸盐熔体 核幔分异 

分 类 号：P574.1[天文地球—矿物学]