Oxygen first accumulated in the Earth’s atmosphere about 2.4 billion years ago, during the Great Oxidation Event.
Oxygen first accumulated in the Earth’s atmosphere about 2.4 billion years ago, during the Great Oxidation Event. A long-standing puzzle has been that geologic clues suggest early bacteria were photosynthesizing and pumping out oxygen hundreds of millions of years before then. Where was it all going?
Something was holding back oxygen’s rise. A new interpretation of rocks billions of years old finds volcanic gases are the likely culprits. The study led by the University of Washington was published in June in the open-access journal Nature Communications.
“This study revives a classic hypothesis for the evolution of atmospheric oxygen,” said lead author Shintaro Kadoya, a UW postdoctoral researcher in Earth and space sciences. “The data demonstrates that an evolution of the mantle of the Earth could control an evolution of the atmosphere of the Earth, and possibly an evolution of life.”
Read more at University of Washington
Image: These giant mounds of fossil stromatolites from about 2.5 billion years ago are located in South Africa. For scale, notice a person’s dangling legs at the top center. These layered minerals were deposited on an ancient coastline by communities of microbes, including photosynthetic bacteria that generated oxygen. The new study suggests that for millions of years the oxygen produced by these microbes reacted with volcanic gases before it began to accumulate in Earth’s atmosphere, about 2.4 billion years ago. CREDIT: David Catling / University of Washington
