对幔源岩中流体组成的不同测定方法评价  

An Appraisal of Different Experimental Methods in the Determination of Fluid Composition in Mantle-derived Rocks

作　　者：张铭杰[1] 王先彬[1] 李立武[1] 

机构地区：[1]中国科学院兰州地质研究所

出　　处：《地质论评》2000年第2期160-166,共7页Geological Review

基　　金：国家自然科学基金 (编号49233060;49133090)

摘　　要：本文对比了目前广泛用于幔源岩中流体组成测定的不同实验方法,讨论了每种方法的优点和适用范围。根据地幔流体所处特殊的地幔环境(高温高压),认为分步加热质谱法测定的结果较全面地代表了幔源岩中流体的真实组成;在实验过程中进行有效的样品处理,采用合理的实验装置和系统本底,对获取可靠的数据至关重要;且通过控制加热温度可对不同类型的流体组分分别进行研究。The mantle fluids play an important role during the plutonic processes of mantle metasomatism, partial melting, and mantle chemical heterogeneity etc. The immediate information of mantle fluids such as their composition and nature have been effectively obtained by the study of the fluid components hosted in mantle xenoliths, but there are distinct differences in the results of different experimental methods. The present paper makes a comparison between the different experimental methods which are widely used in the determination of fluid composition in mantle-derived rocks and discusses the advantages and applications of each method. Based on the particular milieu (high temperature and pressure) in the mantle where mantle fluids exist, it is suggested that the determined results of fluid composition in mantle-derived rocks with the stepwise heating mass spectrometry method can comprehensively represent the real composition of the mantle fluids. It is essential for the reliability of data that effective sample treatment, reasonable pyrolysis apparatus and system backgroud be employed in the experimental and calculation processes, and different types of fluid components can be separately studied by controlling the heating temperature.

关 键 词：实验方法 流体组成 幔源岩 测定法 地幔流体 

分 类 号：P641.2[天文地球—地质矿产勘探]