Oxidation? In MY subarc mantle? It’s more likely than you think, thanks to serpentinite.
Subducted slabs containing fluids stored in serpentinite discovered to affect oxidation states in the mantle and influence earth’s oxygen reclycling process.
Source material:
Serpentinite-derived slab fluids control
the oxidation state of the subarc mantle, by Zhang et al., published November 2021
https://www.science.org/doi/10.1126/sciadv.abj2515
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