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• W2612728509 abstract "Abstract The redox budget during subduction is tied to the evolution of oxygen and biogeochemical cycles on Earth's surface over time. The sulphide–sulphate couple in subducted crust has significant potential for redox and control on extraction of chalcophile metals from the arc mantle. We derive oxygen buffers for sulphide–sulphate stability (‘SSO buffers’) using mineral assemblages in subducted crust within the eclogite facies, and examine their disposition relative to the f O 2 in the arc mantle along various P–T trajectories for subduction. The f O 2 required for sulphide stability in subducted crust passing beneath an arc is shifted by variations in the bulk Ca/(Ca + Mg + Fe) of the subducting crust alone. Hotter slabs and more Fe-rich sediments stabilize sulphide and favour chalcophile sequestration deep into the mantle, whereas colder slabs and calcic sediment will stabilize anhydrite, in some cases at depths of melt generation in the arc mantle ( f O 2 of the arc mantle. We performed melting experiments on three subducted sediment compositions varying in bulk Ca/(Ca + Mg + Fe) from 0.3 to 0.6 at 2.5 GPa and 900–1100 °C to confirm how anhydrite stability can change by orders of magnitude the S, Cu, As, Zn, Mo, Pb, and Sb contents of sediment melts, and their subsequent liberation to the arc mantle. Using Cu/Sc as a proxy for the behaviour of S, the effect of variable subducted sediment composition on sulphide–sulphate stability and release of chalcophiles to the arc mantle is recognizable in volcanic suites from several subduction zones in space and time. The f O 2 of the SSO buffers in subducted sediment relative to the arc mantle may have changed with time by shifts in the nature of pelagic sedimentation in the oceans over earth history. Oxidation of arc mantle and the proliferation of porphyry Cu deposits may be latter-day advents in earth history partly due to the rise of planktic calcifiers in the oceans in only the past 250 million years." @default.
• W2612728509 created "2017-05-19" @default.
• W2612728509 creator A5027785588 @default.
• W2612728509 creator A5049244139 @default.
• W2612728509 date "2017-07-01" @default.
• W2612728509 modified "2023-09-24" @default.
• W2612728509 title "Sulphide–sulphate stability and melting in subducted sediment and its role in arc mantle redox and chalcophile cycling in space and time" @default.
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• W2612728509 doi "https://doi.org/10.1016/j.epsl.2017.04.028" @default.
• W2612728509 hasPublicationYear "2017" @default.
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