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- W4322765963 abstract "High-pressure dehydration of serpentinite during subduction generates fluids that flux and melt the overlying mantle wedge, forming primary arc basalts. These basalts are substantially more oxidized than their mid-ocean ridge counterparts. At the slab surface of current subduction zones, these deserpentinization fluids are intrinsically oxidized, but, owing to the low sulfur content of subducted serpentinite, they only result in a low mantle wedge oxidation rate, which cannot account for the oxidized source of arc basalts. Here we show that infiltration of sediment-derived fluids modulates and can drastically change the oxidation capacity of deserpentinization slab fluids. The modulation of the deserpentinization oxidation capacity mostly depends on the stability and abundance of dissolved oxidized aqueous species of redox-sensitive elements—notably sulfate—and not solely on the oxidation state of the sediment. Infiltration of CH4-bearing fluids derived from graphite-bearing sediment reduces the intrinsically high oxidant capacity of deserpentinization fluids, explaining the relatively low fO2 observed in natural metaperidotite. Infiltration of sulfate-CO2-bearing, sediment-derived fluids—prevalent in modern subduction zones—generates deserpentinization fluids with a high oxidation capacity in cold and hot subduction zones, resulting in a global mantle wedge oxidation rate of 3.5 km3 yr−1. Such slab fluids will oxidize the mantle wedge at a rate similar to that of arc-basalt generation and thus account for the oxidized nature of arc volcanism. The source of highly oxidized arc magmas may rely on the infiltration of sediment-derived fluids that contain oxidized aqueous species—notably sulfate—into deserpentinization fluids, according to thermodynamic modelling." @default.
- W4322765963 created "2023-03-03" @default.
- W4322765963 creator A5002704321 @default.
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- W4322765963 creator A5062575107 @default.
- W4322765963 creator A5084928557 @default.
- W4322765963 date "2023-03-01" @default.
- W4322765963 modified "2023-10-17" @default.
- W4322765963 title "Mantle wedge oxidation from deserpentinization modulated by sediment-derived fluids" @default.
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- W4322765963 doi "https://doi.org/10.1038/s41561-023-01127-0" @default.
- W4322765963 hasPublicationYear "2023" @default.
- W4322765963 type Work @default.