A mineral-based origin of Earth's initial hydrogen peroxide and molecular oxygen.

ABSTRACT: Terrestrial reactive oxygen species (ROS) may have played a central role in the formation of oxic environments and evolution of early life. The abiotic origin of ROS on the Archean Earth has been heavily studied, and ROS are conventionally thought to have originated from H₂O/CO₂ dissociation. Here, we report experiments that lead to a mineral-based source of oxygen, rather than water alone. The mechanism involves ROS generation at abraded mineral-water interfaces in various geodynamic processes (e.g., water currents and earthquakes) which are active where free electrons are created via open-shell electrons and point defects, high pressure, water/ice interactions, and combinations of these processes. The experiments reported here show that quartz or silicate minerals m

SUBMITTER: He H 

PROVIDER: S-EPMC10068795 | biostudies-literature | 2023 Mar

REPOSITORIES: biostudies-literature