铁同位素方法在环境地球化学研究中的应用与进展

由于同位素分析方法的改进和多接收电感耦合等离子体质谱仪的使用,近年来Fe同位素地球化学研究有了很大进展,成为国际地学领域的一个热点研究方向。Fe在自然界广泛存在,分布于各类矿物、岩石、流体和生物体中,并广泛参与成岩成矿作用、热液活动和生命活动过程。自然界中各类无机过程(从高温到低温)、生物及有机过程均能使Fe同位素发生分馏,δ56Fe值约为-1.62‰～+0.91‰。文章系统介绍了Fe同位素研究的最新进展,包括Fe同位素测试方法简介、样品前处理、质谱测定、Fe同位素分馏机理和应用前景展望等,着重对该技术在环境地球化学、生物示踪、古海洋学研究等领域中的应用及前景做了阐述。

ADVANCES IN APPLICATIONS OF IRON ISOTOPES IN ENVIRONMENTAL GEOCHEMISTRY

Thanks to advances in analytical methodology,especially the use of multiple collector inductively coupled plasma mass spectrometry,a great progress has been made in isotope geochemistry of iron in recent few years and it has become one of the exciting frontier sciences in geo-scientific studies.Iron is a ubiquitous element in various minerals,rocks,fluids,and biological materials,and extensively takes part in ore-forming,rock-forming,hydrothermal and biological processes.Iron isotope fractionation,which mainly varies from-1.62‰ to +0.91‰,occurs in many biological and inorganic processes.In this paper,we summarize recent advances in iron isotope analytical methodology,for example,sample pretreatment,iron isotope mass spectrometry and fractionation mechanisms,and applications of iron isotopes in environmental geochemistry,bio-signature,oceanography and so on.