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April 17, 2026American Mineralogist

Determination of Fe oxidation state in tourmaline with the flank method by electron probe microanalysis

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Authors

DQDongmei QiCZChao ZhangHYHaoyang Yuan

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Overview

Demonstrates accurate measurement of Fe oxidation state in tourmaline, indicating oxygen fugacity in geological systems.

Key Points

  • The central aim is to accurately determine the Fe oxidation state in tourmaline using a refined electron probe microanalysis method.
  • Calibrated electron probe microanalysis flank method for in-situ analysis.
  • Utilized eight tourmaline crystals as reference materials.
  • Field-emission microprobe with TAPL crystals for high-intensity FeL spectra.
  • Synthetic garnet end-members used to establish measurement parameters.
  • Fe2+ content showed a linear correlation with Lβ/Lα intensity ratios at flank positions.
  • Fe3+/ΣFe ratios matched well with wet chemistry results, indicating theoretical reliability.
  • Analytical accuracy was better than ±0.1 for FeOT ≥3 wt% and ±0.05 for FeOT ≥12 wt%.

Cite This Study

Qi et al. (2026) studied this question.

synapsesocial.com/papers/69e1ce605cdc762e9d857615https://doi.org/10.2138/am-2025-10018
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