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近年来,由于分析手段的不断改进,锂同位素的精确测试才得以实现。锂以其分馏大、中度不相容、易随流体迁移、地表环境与地幔锂同位素特征差异明显等优势,被认为是极具潜力的示踪元素。目前,锂同位素在壳幔物质循环、风化作用、岩浆作用、流体(热液)活动等方面研究中已得到广泛的应用,其中又以俯冲带锂同位素的研究程度最高。本文主要从锂同位素分馏机理、俯冲带锂的行为特征、岛弧岩浆的锂同位素研究以及深俯冲作用过程中锂的行为等方面总结了当前国内外锂同位素的研究进展。
In recent years, due to the continuous improvement of analytical tools, accurate testing of lithium isotopes was achieved. Lithium is regarded as a potential trace element due to its large fractionation, moderate incompatibility, easy migration with fluids, and significant differences in the lithospheric features of the earth’s surface and mantle. At present, lithium isotopes have been widely used in crust-mantle material circulation, weathering, magmatism, fluid (hydrothermal) activity and so on. Among them, lithium isotopes are the most studied in subduction zone. In this paper, the research progress of lithium isotopes at home and abroad are summarized from the mechanism of lithium isotope fractionation, the behavior characteristics of subduction zone lithium, the lithium isotope of island arc magma and the behavior of lithium during deep subduction.