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Manganese incorporation in synthetic hercynite

Published online by Cambridge University Press:  02 January 2018

G. D. Bromiley ,
G. D. Gatta  and
T. Stokes
G. D. Bromiley*
Affiliation:
School of GeoSciences, Grant Institute, University of Edinburgh, King’s Buildings, Edinburgh EH9 3JW, UK Centre for Science at Extreme Conditions, Erskine Williamson Building, University of Edinburgh, King’s Buildings, Edinburgh EH9 3JZ, UK
G. D. Gatta
Affiliation:
Dipartimento di Scienze della Terra, Università degli Studi Milano, Via Botticelli 23, I-20133 Milano, Italy CNR - Istituto di Cristallografia, Sede di Bari, Via G. Amendola 122/o, I-70126 Bari, Italy
T. Stokes
Affiliation:
School of GeoSciences, Grant Institute, University of Edinburgh, King’s Buildings, Edinburgh EH9 3JW, UK
*
*E-mail: [email protected]
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Abstract

Manganese incorporation in synthetic hercynite, and partitioning between hercynite and silicate melt synthesized at 1.0 GPa, 1250°C, and at an fO2 buffered by Fe–FeO, has been studied by X-ray absorption spectroscopy and single-crystal X-ray structure refinement. Spectra indicate the presence of both Mn2+ and Mn3+ (and possibly also Mn4+) in synthetic hercynite and partitioning of Mn2+ into the melt phase, and Mn3+ into hercynite, respectively, under run conditions. X-ray refinement is consistent with partial disorder of Fe and Al across tetrahedral and octahedral sites. A higher than expected degree of Fe-Al disorder in the Mn-bearing hercynite can be explained by preferential incorporation of Mn2+ onto the tetrahedral site, and indicates that Fe-Al disorder in pure, stoichiometric hercynite cannot necessarily be used to determine closure temperatures in natural spinel. However, partitioning of Mn2+ and Mn3+ between melt and hercynite suggests that Mn incorporation in hercynite could be used as a measure of fO2 conditions in magmas during spinel crystallization.

Keywords

hercynitespinelmanganeseoxygen fugacitydisordercrystal chemistry
Type
Research Article
Information
Mineralogical Magazine , Volume 79 , Issue 3 , June 2015 , pp. 635 - 647
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2015

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