Water and the Oxidation State of Subduction Zone Magmas

dc.contributor.authorKelley, Katherine A.
dc.contributor.authorCottrell, Elizabeth
dc.date.accessioned2010-03-24T17:41:45Z
dc.date.available2010-03-24T17:41:45Z
dc.date.issued2009
dc.description.abstractMantle oxygen fugacity exerts a primary control on mass exchange between Earth's surface and interior at subduction zones, but the major factors controlling mantle oxygen fugacity (such as volatiles and phase assemblages) and how tectonic cycles drive its secular evolution are still debated. We present integrated measurements of redox-sensitive ratios of oxidized iron to total iron (Fe3+/{Sigma}Fe), determined with Fe K-edge micro-x-ray absorption near-edge structure spectroscopy, and pre-eruptive magmatic H2O contents of a global sampling of primitive undegassed basaltic glasses and melt inclusions covering a range of plate tectonic settings. Magmatic Fe3+/{Sigma}Fe ratios increase toward subduction zones (at ridges, 0.13 to 0.17; at back arcs, 0.15 to 0.19; and at arcs, 0.18 to 0.32) and correlate linearly with H2O content and element tracers of slab-derived fluids. These observations indicate a direct link between mass transfer from the subducted plate and oxidation of the mantle wedge.
dc.format.extent605–607
dc.identifier0036-8075
dc.identifier.citationKelley, Katherine A. and Cottrell, Elizabeth. 2009. "<a href="https://repository.si.edu/handle/10088/8837">Water and the Oxidation State of Subduction Zone Magmas</a>." <em>Science</em>, 325, (5940) 605–607. <a href="https://doi.org/10.1126/science.1174156">https://doi.org/10.1126/science.1174156</a>.
dc.identifier.issn0036-8075
dc.identifier.urihttp://hdl.handle.net/10088/8837
dc.publisherAmerican Association for the Advancement of Science
dc.relation.ispartofScience 325 (5940)
dc.titleWater and the Oxidation State of Subduction Zone Magmas
dc.typearticle
sro.description.unitNMNH
sro.description.unitNH-Paleobiology
sro.identifier.doi10.1126/science.1174156
sro.identifier.itemID79111
sro.identifier.refworksID47242
sro.identifier.urlhttps://repository.si.edu/handle/10088/8837
sro.publicationPlaceWashington, DC

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