Study Links 3 Oxygen Surges to Tectonic Subduction Shifts Over 2.4 Billion Years

1 articles · Updated · Ars Technica · May 26

A new study led by Wei Shi found that changes in tectonic plate subduction line up with three major jumps in Earth’s atmospheric oxygen, tying deep-Earth processes to long-term habitability.
The proposed mechanism is Earth’s gradual cooling: as the planet cooled, subduction evolved from early sinking of dense crust into more modern plate tectonics, altering how oxygen moved between rocks and the atmosphere.
The timing matches the Great Oxygenation Event about 2.4 billion to 2.0 billion years ago, a renewed rise between 800 million and 500 million years ago, and a third increase from 450 million to 250 million years ago.
The study does not replace biology as the driver of oxygen production; it adds solid-Earth chemistry and tectonic recycling to explain why oxygen buildup occurred in jumps rather than as a smooth rise.

How does a cooling planet's shifting crust create the oxygen essential for life's great evolutionary leaps?

Is an evolving tectonic system a universal requirement for creating a breathable atmosphere on other planets?