The provenance of oxygen (O2) has been linked to the early Earth’s atmospheric and biological evolution. A permanent rise to appreciable concentrations of O2 in the atmosphere, known as the “Great Oxidation Event (GOE),” was estimated to have occurred at around 2.4 billion years ago. However, the cause of the GOE still remains unclear.
Click here for original story, Oxygen production from volcanic sulfur dioxide photochemistry: A possible trigger for Earth’s great oxidation event
Source: Phys.org