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Subducting serpentinites release reduced, not oxidized, aqueous fluids.

ABSTRACT: The observation that primitive arc magmas are more oxidized than mid-ocean-ridge basalts has led to the paradigm that slab-derived fluids carry SO₂ and CO₂ that metasomatize and oxidize the sub-arc mantle wedge. We combine petrography and thermodynamic modelling to quantify the oxygen fugacity (fO₂) and speciation of the fluids generated by serpentinite dehydration during subduction. Silicate-magnetite assemblages maintain fO₂ conditions similar to the quartz-fayalite-magnetite (QFM) buffer at fore-arc conditions. Sulphides are stable under such conditions and aqueous fluids contain minor S. At sub-arc depth, dehydration occurs under more reducing conditions producing aqueous fluids carrying H₂S. This finding brings into question current models in which serpentinite-derived fluids are the cause of oxidized arc magmatism and has major implications for the global volatile cycle, as well as for redox processes controlling subduction zone geodynamics.

SUBMITTER: Piccoli F

PROVIDER: S-EPMC6925189 | biostudies-literature | 2019 Dec

REPOSITORIES: biostudies-literature

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Subducting serpentinites release reduced, not oxidized, aqueous fluids.

Piccoli F F Hermann J J Pettke T T Connolly J A D JAD Kempf E D ED Vieira Duarte J F JF

Scientific reports 20191220 1

The observation that primitive arc magmas are more oxidized than mid-ocean-ridge basalts has led to the paradigm that slab-derived fluids carry SO2 and CO2 that metasomatize and oxidize the sub-arc mantle wedge. We combine petrography and thermodynamic modelling to quantify the oxygen fugacity (fO2) and speciation of the fluids generated by serpentinite dehydration during subduction. Silicate-magnetite assemblages maintain fO2 conditions similar to the ...[more]

PMID: 31862932

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