Evidence of sub-arc mantle oxidation by sulphur and carbon

55Citations
Citations of this article
76Readers
Mendeley users who have this article in their library.

Abstract

The oxygen fugacity (fO2) of the Earth's mantle at subduction zones exerts a primary control on the genesis of mineral deposits in the overlying magmatic arcs and on speciation of volcanic gases emitted into the atmosphere. However, the processes governing mantle fO2 such as the introduction of oxidised material by subduction are still unresolved. Here, we present evidence for the reduction of oxidised fluid-borne sulphur and carbon during alteration of depleted mantle by slab fluids at ultra-high pressure in the Bardane peridotite (Western Gneiss Region, Norway). Elevated ferric iron in metasomatic garnet, determined using synchrotron X-ray absorption near edge structure (XANES) spectroscopy, indicates that this process drove oxidation of the silicate assemblage. Our finding indicates that subduction oxidises the Earth's mantle by cycling of sulphur and carbon.

Cite

CITATION STYLE

APA

Rielli, A., Tomkins, A. G., Nebel, O., Brugger, J., Etschmann, B., Zhong, R., … Paterson, D. (2017). Evidence of sub-arc mantle oxidation by sulphur and carbon. Geochemical Perspectives Letters, 3(2), 124–132. https://doi.org/10.7185/geochemlet.1713

Register to see more suggestions

Mendeley helps you to discover research relevant for your work.

Already have an account?

Save time finding and organizing research with Mendeley

Sign up for free