Extended Data Fig. 4: Magnetite content as a function of the state of hydration.
From: Mantle wedge oxidation from deserpentinization modulated by sediment-derived fluids
Global compilation of magnetite content in serpentinite and metaperidotite (Chl-harzburgite) against the water content (measured for CdA, this work and ref. 27) or loss of ignition (L.O.I.) as a proxy for water content for samples from the literature (see Methods). The observed decrease in magnetite content relative to common magnetite-bearing serpentinite is reproduced by deserpentinization infiltrated with highly reducing fluids equilibrated with graphite-bearing metapelite. The decrease in magnetite for the intrinsic deserpentinization model is coeval with the precipitation of haematite (dashed red line) which is not observed in natural samples.
