电子探针Fe价态原位分析的原理和方法

张超; 李晓彦

doi:10.16152/j.cnki.xdxbzr.2025-03-008

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电子探针Fe价态原位分析的原理和方法

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- 电子探针Fe价态原位分析的原理和方法
- Review of the principel and method for EPMA in-situ analysis of Fe oxidation state
- 西北大学学报（自然科学版） 2025年55卷第3期页码：585-600
- 作者机构：
  
  西北大学　地质学系/大陆演化与早期生命全国重点实验室，陕西　西安　 710069
- 作者简介：
  
  [ "张超，男，1982年生，教授，专业方向为岩浆岩岩石学和电子探针分析技术。2012年获德国汉诺威大学自然科学博士学位，2018年入职西北大学地质学系，入选陕西省高层次人才引进计划青年项目和国家高层次人才青年拔尖支持计划。研究兴趣包括利用高温高压实验模拟、高精度原位分析技术、大数据和机器学习方法研究矿物化学和P-T-fO2模型、火山活动和深部挥发份循环、岩浆体系中的挥发份及其成矿意义。以第一作者或通讯作者已在EPSL、GCA、JGR-SE、JP、AM、CG等学术期刊发表论文30余篇。" ]
- 基金信息：
  
  国家自然科学基金(42372069);科技部重点研发计划(2023YFF0804200)
- DOI：10.16152/j.cnki.xdxbzr.2025-03-008
  中图分类号： P575;P595
- 收稿日期：2025-03-15，
  
  纸质出版日期：2025-06-25
- 稿件说明：
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张超, 李晓彦. 电子探针Fe价态原位分析的原理和方法[J]. 西北大学学报（自然科学版）, 2025,55(3):585-600.

ZHANG Chao, LI Xiaoyan. Review of the principel and method for EPMA in-situ analysis of Fe oxidation state[J]. Journal of northwest university (natural science edition), 2025, 55(3): 585-600.
张超, 李晓彦. 电子探针Fe价态原位分析的原理和方法[J]. 西北大学学报（自然科学版）, 2025,55(3):585-600. DOI： 10.16152/j.cnki.xdxbzr.2025-03-008.

ZHANG Chao, LI Xiaoyan. Review of the principel and method for EPMA in-situ analysis of Fe oxidation state[J]. Journal of northwest university (natural science edition), 2025, 55(3): 585-600. DOI： 10.16152/j.cnki.xdxbzr.2025-03-008.

摘要

氧化还原状态不仅是评估星球宜居性的关键因素，也是地球内部圈层和表层环境之间物质循环和耦合演化的重要驱动力。铁（Fe）是类地行星中含量最高的变价元素，因此Fe价态（通常用Fe

/ΣFe或Fe

/Fe

表示）是反映体系氧逸度的关键参数。该文详细探讨了电子探针在测定地质样品Fe价态的理论基础及其应用方法，分析了与之相关的X射线的激发与吸收原理、自吸收效应以及配位场理论，阐释了Fe价态测定依赖的

线系谱线特征。在此基础上，对比了峰肩法与峰位漂移法的优缺点，展示了不同样品在电子轰击下的损伤情况。研究表明，电子探针直接测定Fe价态方法具有广泛的应用前景和明显的技术优势，但仍需根据不同样品的特点优化测试条件和流程，以提高测试的准确性和可靠性。该研究为进一步开发和推广Fe价态测定方法提供了理论支持和实践指导，具有重要的地球科学研究意义。

Abstract

The redox state is not only a key factor in assessing planetary habitability

but also a crucial variable connecting Earth's interior spheres and surface environment via mass recycling and co-variation. Iron (Fe)

as the most abundant multivalent element in terrestrial planets

its oxidation state (expressed as Fe

/ΣFe or Fe

/Fe

) being the most important parameter reflecting the oxygen fugacity of the system. This study thoroughly investigates the application and theoretical foundation of electron probe microanalysis (EPMA) in the determination of Fe oxidation states in geological samples. We comprehensively analyzed the principles of X-ray emission and absorption

self-absorption effect

and crystal field theory

providing a detailed elucidation of the spectral characteristics of Fe's

-series lines. Accordingly

we compared the advantages and disadvantages of the peak shift method and the flank method

and examined the damage inflicted on samples under electron bombardment. The results demonstrate that EPMA holds extensive application potential and overwhelming advantages in the determination of Fe oxidation state

but the analytical protocol and condition must be optimized to enhance test accuracy and reliability according to the characteristics of different samples. This research offers theoretical support and practical guidance for further development and promotion of Fe valence determination methods

holding significant

implications for earth science research.

关键词

Keywords

references

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