表生过程中铁的同位素地球化学

铁同位素地球化学已成为当前国际上地球化学领域的研究热点。表生过程涉及地球表层,包括大气圈、水圈、生物圈及岩石圈浅部,与人类生活密切相关,也是地球科学中的基本地质过程之一。本文对表生体系中的土壤、河流、海洋等主要储库的铁同位素组成特征及表生体系铁同位素分馏的基本过程进行总结。在此基础上,对表生过程中的风化作用、河流搬运作用、沉积作用、成岩作用及海洋铁的地球化学循环过程中铁的同位素地球化学行为进行介绍。表生过程中铁的同位素地球化学理论框架已经基本建立,并且显示出铁同位素是表生地球化学领域新的示踪工具。

Fe Isotope Geochemistry of Earth Surface System

Fe isotope geochemistry has been attracted more and more attentions recent years. Understanding the supergene processes occurred in the Earth surface system, which includes atmosphere, hydrosphere, biosphere, and the surface of lithosphere, are essential for geoscience. Here the Fe isotope compositions for soil, river, ocean and other main reservoirs of the Earth surface system and basic processes in Earth surface system leading Fe isotope fractionation were summarized. Fe isotope behavior during supergene processes including weathering, river transferring, sedimentation, diagenesis, and Fe cycling in ocean was also presented. The basic theory of Fe isotope geochemistry of Earth surface system have been constructed, and it shows that Fe isotope geochemistry is a powerful tracer for supergene geochemistry.