A new study published by Phys.org reveals that deep magma oceans on early Earth and Mars may have locked ferric iron into the mineral majorite. The oxidation state of a planet's mantle strongly influences magma generation, volcanic gas composition, and surface environment evolution. This finding sheds light on how iron was incorporated during the critical solidification phase of magma oceans.
The magma ocean is believed to have been widespread during the earliest stages of planetary formation. How iron's oxidation state was preserved in mantle minerals has long been a puzzle for scientists. The research suggests majorite acted as a reservoir for ferric iron, potentially shaping subsequent mantle dynamics.
Key details from the study indicate that the incorporation of ferric iron into majorite occurred under the high-pressure conditions of deep magma oceans. This process may have locked in an oxidized signature that persisted as the mantle cooled and solidified over geological time.
The findings have implications for understanding the early atmospheric evolution of rocky planets. By altering mantle oxidation, the sequestration of ferric iron could have affected volcanic outgassing and the development of surface conditions. This mechanism may also apply to other terrestrial planets with similar magma ocean histories.
Researchers caution that more modeling and experimental work is needed to confirm the extent of this process across different planetary bodies and mantle depths.