低温环境下铁同位素分馏的若干重要过程  

Fe isotope fractionation during low temperature process

作　　者：李津[1] 朱祥坤[1] 唐索寒[1] 

机构地区：[1]中国地质科学院地质研究所国土资源部同位素地质重点实验室,北京100037

出　　处：《岩石矿物学杂志》2008年第4期305-316,共12页Acta Petrologica et Mineralogica

基　　金：国家自然科学基金重点项目(40331005);国家自然科学杰出青年基金项目(40325008)

摘　　要：详细了解同位素分馏的过程与机理是运用稳定同位素体系解决科学问题的关键。本文对沉淀、溶解、吸附、氧化、还原、生物等过程中的Fe同位素分馏研究结果进行了系统总结。在沉淀过程中,优先沉淀轻同位素;在吸附过程中,Fe(Ⅲ)矿物优先吸附重同位素;氧化还原过程中,Fe的化合价越高,Fe同位素组成越重。A prerequisite for using the new geochemical tracer--Fe isotope--to constrain some important geochemical processes lies in the adequate understanding of the process and mechanism of Fe isotope fractionation. This paper presents a review of the current situation of people＇s understanding of mass fractionation processes at low-temperature environments, which include precipitation, dissolution, reduction, oxidation, adsorption, and biological processes. During the precipitation, the resultant is depleted in heavy Fe and the heavier Fe（Ⅱ） is preferentially adsorbed on the surfaces of Fe（Ⅲ）（hydr）oxides. When different kinds of valence state coexist, heavy isotope is preferentially enriched in high-valence state.

关 键 词：铁同位素 质量分馏 氧化还原 吸附 生物作用 

分 类 号：P597.2[天文地球—地球化学]