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Abstract

The extent to which water and halogens in Earth's mantle have primordial origins, or are dominated by seawater-derived components introduced by subduction is debated. About 90% of non-radiogenic xenon in the Earth's mantle has a subducted atmospheric origin, but the degree to which atmospheric gases and other seawater components are coupled during subduction is unclear. Here we present the concentrations of water and halogens in samples of magmatic glasses collected from mid-ocean ridges and ocean islands globally. We show that water and halogen enrichment is unexpectedly associated with trace element signatures characteristic of dehydrated oceanic crust, and that the most incompatible halogens have relatively uniform abundance ratios that are different from primitive mantle values. Taken together, these results imply that Earth's mantle is highly processed and that most of its water and halogens were introduced by the subduction of serpentinized lithospheric mantle associated with dehydrated oceanic crust.

Item Type:	Article
Authors/Creators:	Kendrick, MA and Hemond, C and Kamenetsky, VS and Danyushevsky, LV and Devey, CW and Rodemann, T and Jackson, MG and Perfit, MR
Keywords:	seawater, lithosphere, mantle, xenon, element cycles, geochemistry, geodynamics
Journal or Publication Title:	Nature Geoscience
Publisher:	Springer Nature
ISSN:	1752-0894
DOI / ID Number:	https://doi.org/10.1038/ngeo2902
Copyright Information:	© 2017 Macmillan Publishers
Related URLs:	Google Scholar: Kamenetsky, VS UTAS Profile: Kamenetsky, VS Google Scholar: Danyushevsky, LV UTAS Profile: Danyushevsky, LV Google Scholar: Rodemann, T UTAS Profile: Rodemann, T
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