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Coupled interactions between volatile activity and Fe oxidation state during arc crustal processes

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Madeleine C.S. Humphreys, R Brooker, D.C. Fraser, A Burgisser, Margaret T. Mangan, and C McCammon, 2015, Coupled interactions between volatile activity and Fe oxidation state during arc crustal processes: Journal of Petrology.

Summary

Arc magmas erupted at the Earth’s surface are commonly more oxidized than those produced at mid-ocean ridges. Possible explanations for this high oxidation state are that the transfer of fluids during the subduction process results in direct oxidation of the sub-arc mantle wedge, or that oxidation is caused by the effect of later crustal processes, including protracted fractionation and degassing of volatile-rich magmas. This study sets out to investigate the effect of disequilibrium crustal processes that may involve coupled changes in H2O content and Fe oxidation state, by examining the degassing and hydration of sulphur-free rhyolites. We show that experimentally hydrated melts record strong increases in Fe3+/∑Fe with increasing [...]

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Type Scheme Key
local-index unknown 70155878
local-pk unknown 70155878
doi http://www.loc.gov/standards/mods/mods-outline-3-5.html#identifier doi:10.1093/petrology/egv017
series unknown Journal of Petrology

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journalJournal of Petrology
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typePublication Place
valueOxford
languageEnglish
citationTypeArticle

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