Redox state of magma ocean set by core-mantle equilibration

This proposal aims at constraining the redox state in quenched experiments representative for the Earth’s magma ocean using the Fe2+/Fe3+ ratio measured by synchrotron Mössbauer spectroscopy. In this proposal, we will investigate silicate glass lamellae (30x20x5 µm) obtained as result of melting equilibrium between primordial silicate Earth’s composition and Fe/Ru metal, acting as redox buffer, in a laser-heated diamond-anvil cell at relevant P-T conditions (30-130 GPa, 2500-4500 K). The experiment will provide vital data for the oxygen fugacity and redox conditions in deep terrestrial magma oceans, with significant implication for the speciation of elements in the Earth’s mantle and for the primordial atmosphere composition.