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Iron speciation using electron microprobe techniques: application to glassy melt pockets within a spinel lherzolite xenolith

Published online by Cambridge University Press:  05 July 2018

M. Fialin ,
C. Wagner  and
M.-L. Pascal
M. Fialin*
Affiliation:
Centre de Microanalyse Camparis, UPMC Univ Paris 06, IPGP, CNRS-UMR 7094, F-75005, Paris, France
C. Wagner
Affiliation:
UPMC Univ Paris 06, UMR 7193, ISTeP, F-75005, Paris, France CNRS, UMR 7193, ISTeP, F-75005, Paris, France
M.-L. Pascal
Affiliation:
UPMC Univ Paris 06, UMR 7193, ISTeP, F-75005, Paris, France CNRS, UMR 7193, ISTeP, F-75005, Paris, France
*
*E-mail: [email protected]
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Abstract

A quantitative determination of Fe3+/ΣFe ratios using the electron microprobe is presented for glasses. The measurements are based on the shift of the Fe-Lα peak position between Fe3+ and Fe2+, resulting from differences in self-absorption. We present new calibration curves for glasses with Fe contents as low as 2 wt.% Fe.

This method was used for glasses from a metasomatized spinel Iherzolite (Massif Central, France) in which highly vesicular glass associated with secondary minerals occurs in reaction pockets around corroded Cr-spinels. The glass was found to be oxidized homogeneously with Fe3+/ΣFe ≈ 0.70 (measured with an uncertainty of ±0.06), in contrast with the value of ∼0.15 that would correspond to the former melt under fo2 conditions inferred from secondary minerals. The glass oxidation probably results from the dissociation of the melt-water content under degassing, prior to local hematite depositions (spinel rims and crack fillings).

Keywords

iron speciationelectron microprobeoxidationmantle-xenolith glasses
Type
CNMNC Newsletter 8
Information
Mineralogical Magazine , Volume 75 , Issue 2 , April 2011 , pp. 347 - 362
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2011

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