Mg同位素体系在壳--幔演化中的应用与展望

Application and Prospect of Mg Isotope System in Crust-Mantle Evolution

Mg同位素作为新兴地质示踪剂在非传统稳定同位素领域逐渐受到地学界的关注。根据自然界Mg同位素的组成特征,其地球化学的研究主要集中展示地质历史时期星云形成过程、海水的Mg同位素组成演变、回溯岩浆来源、估算大陆风化通量、记录亏损地幔、地幔交代作用和壳内物质循环等方面。在简要介绍Mg同位素体系的基础上,重点介绍近年来国际上有关Mg同位素体系在地幔地球化学、壳—幔物质交换等过研究中取得的重要成果,展示Mg同位素体系在地幔地球化学和壳—幔相互作用研究中的重要性及其可能的应用前景。

Mg isotopes are gradually gaining attention as emerging geological tracers in the field of non-traditional stable isotopes.According to the composition characteristics of Mg isotopes in nature,its geochemical research mainly focuses on showing the formation of nebulae in the geological history,the evolution of the Mg isotopic composition of seawater,tracing the source of magma,estimating continental weathering flux,recording depleted mantle,mantle metasomatism,and crust material circulation and other aspects.On the basis of a brief introduction of the Mg isotope system,this paper focuses on the important achievements of the international studies on the Mg isotope system in the mantle geochemistry,the crust mantle material exchange,etc.,the importance of Mg isotope system in the study of mantle geochemistry and crust mantle interaction and its potential application are also demonstrated.