铬稳定同位素地球化学  

Stable chromium isotope geochemistry

作　　者：王相力 卫炜 WANG Xiangli;WEI Wei(University of South Alabama,AL 36688,USA;Dauphin Island Sea Lab,AL 36528,USA;CAS Key Laboratory of Crust-Mantle Materials and Environments,School of Earth and Space Sciences,University of Science and Technology of China,Hefei 230026,China)

机构地区：[1]University of South Alabama,Mobile,AL 36688,USA [2]Dauphin Island Sea Lab,DauphinIsland,AL 36528,USA [3]中国科学技术大学地球和空间科学学院中国科学院壳幔物质和环境重点实验室,安徽合肥230026

出　　处：《地学前缘》2020年第3期78-103,共26页Earth Science Frontiers

基　　金：国家自然科学基金青年科学基金项目(41902025);安徽省自然科学基金面上项目(1908085MD112);中国博士后科学基金面上项目(2019M652199);中央高校基本科研业务费专项资金项目(WKZ2080000120)。

摘　　要：随着多接收质谱仪分析技术的进步,铬稳定同位素体系在最近二十几年的环境科学和地球化学中得到了越来越广泛的应用。铬元素属于氧化还原敏感元素,在氧化还原反应过程中伴随着较大的同位素分馏。因此,铬同位素在指示现代或古代环境的氧化还原状态方面有着重要的应用。同时,铬也是中度相容和轻度亲铁元素,使得铬稳定同位素体系也可用来制约高温地质过程(如核幔分异、地幔熔融和岩浆分异结晶等)以及地外行星的演化。本综述首先介绍铬稳定同位素体系,随后讲述分析方法、铬同位素分馏原理以及铬同位素在高温、低温地球化学中的应用。With the advancement of multicollector mass spectrometry,the stable chromium isotopic system has been widely applied to solving environmental and geochemical problems.Chromium is a redox-sensitive element,and transformations between different oxidation states are accompanied by large isotopic fractionations.Therefore,chromium isotopes play important roles in investigating the redox conditions of modern and paleo-environments.Moreover,chromium is a moderately compatible and slightly siderophile element,and large isotope fractionation exists between different minerals.Thus,chromium isotopes can also be potentially applied to study mantle partial melting,magma differential crystallization,and planetary evolution.In this review,we covered the following topics:(1)an overview of chromium stable isotopic systematics;(2)analytical methods;(3)isotopic fractionation mechanisms;and(4)applications of stable chromium isotopes in high-and low-temperature geochemistry.

关 键 词：铬同位素 氧化还原指标 古环境 地外行星演化 

分 类 号：P597.2[天文地球—地球化学]