摘要
铁是太阳系中丰度最高的金属元素,参与了行星形成与演化的每一个阶段,尤其是主导了行星早期的核幔分异过程.因此,铁同位素可以作为我们认识太阳系起源和行星演化的可靠示踪剂.21世纪初,电感耦合等离子体质谱仪的引入打开了研究高精度铁同位素领域的大门.本文综述了地球、月球及火星等太阳系各储库的铁同位素组成、高温高压下金属与硅酸盐分离过程中铁同位素分馏的实验进展、超高压下NRIXS实验、静高压实验的发展和多种同位素的耦合示踪研究,以期为探索行星起源与演化过程提供新线索.
Abstract
Iron is the most abundant metallic element in the solar system and has been pervasively involved in all processes of the formation and evolution of planets,especially in the core-mantle differentiation process of the early planets.Thus,iron isotopes can be used as reliable tracers for understanding the origin of the solar system and the evolution of planets.In the early 21st century,the introduction of Inductively coupled plasma mass spectrometry(ICP-MS)opened the door to researchers for studying high-precision iron isotopes.In this paper,we have comprehensively summarized the iron isotopic compositions of various reservoirs of celestial bodies,such as Earth,Moon and Mars,in the solar system,advances in experiments of iron isotope fractionation in the segregation process of silicate and metal at high temperature and high pressure,the progress of NRIXS measurements at ultrahigh pressure,the development of static high-pressure experiments,and the tracing researches by using the coupled multiple isotopes,in order to provide new clues for exploring the origin and evolution of planets.
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