The effect of subduction on the sulphur, carbon and redox budget of lithospheric mantle

Abstract

Subduction of hydrated lithospheric mantle introduces H2O, ferric iron, oxidized carbon and sulphur to the subduction zone system. The fate of these components is poorly known, but is intimately linked to the global geochemical cycles of iron, carbon and sulphur, the genesis of arc-related ore deposits, the temporal evolution of mantle redox state and subduction-related earthquakes and magmatism. thermocalc is used to provide first-order constraints on the effect of subduction zone metamorphism on metamorphic redistribution of iron, carbon, sulphur and water in ultramafic rocks via construction of P-T and T-X(O) pseudosections with open system calculation of the effect of fluid loss. The cal..