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February 12, 2024European Journal of MineralogyOpen Access

Confocal μ-XANES as a tool to analyze Fe oxidation state in heterogeneous samples: the case of melt inclusions in olivine from the Hekla volcano

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Authors

RBRoman BotcharnikovMWMax WilkeJGJan Garrevoet

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Overview

Spectroscopic analysis reveals elevated iron oxidation in volcanic melt inclusions, indicating diffusive hydrogen loss alters natural melt records.

Key Points

  • Natural melt inclusions in olivine from Hekla volcano display marked oxidation, showing elevated Fe3+/ΣFe values compared to equilibrium conditions.
  • The Fe oxidation state shifts from 0.17 in basaltic to 0.45 in dacitic melts, whereas mineral equilibria maintain Fe3+/ΣFe ratios of 0.20 or less.
  • Confocal μ-XANES analysis reveals that post-entrapment diffusive hydrogen loss induces Fe oxidation, highlighting a bias in silicic melt records.

Cite This Study

Botcharnikov et al. (2024) studied this question.

synapsesocial.com/papers/68e7982fb6db643587708358https://doi.org/10.5194/ejm-36-195-2024
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Also Consider

Synapse has enriched 3 closely related papers on similar clinical questions. Consider them for comparative context:

  1. 1The origin of S4+ detected in silicate glasses by XANES2007 · 131 citations
  2. 2Amorphous Materials: Properties, structure, and Durability: Oxidation state of iron in hydrous phono-tephritic melts2008 · 152 citations
  3. 3Confocal XANES and the Attic Black Glaze: The Three-Stage Firing Process through Modern Reproduction2014 · 34 citations