Volcanic degassing and oxygen rise

A study of basalt cores from Hawaii’s Mauna Kea volcano finds that Mauna Kea magmas that had experienced the least amount of volcanic degassing were more oxidized than midocean ridge basalt magmas, and that degassing reduced the oxidation state of Mauna Kea magmas; modeling suggests that, if the Mauna Kea degassing trend were broadly applied to basaltic systems, degassing basalts would not explain the rise of oxygen at the end of the Archean eon.

Article #16-19527: “Redox variations in Mauna Kea lavas, the oxygen fugacity of the Hawaiian plume, and the role of volcanic gases in Earth’s oxygenation,” by Maryjo Brounce, Edward Stolper, and John Eiler.