Rise and fall of oxygen
THE earth’s oxygen levels rose and fell more than once hundreds of millions of years before the planet-wide success of the Great Oxidation Event (GOE) about 2.4 billion years ago, according to University of Washington (U.W.) researchers.
“The production and destruction of oxygen in the ocean and atmosphere over time was a war with no evidence of a clear winner, until the Great Oxidation Event,” says Matt Koehler, the lead author of a new paper published in the recent issue of “Proceedings of the National Academy of Sciences” (PNAS).
In 2007, co-author Roger Buick was part of an international team of scientists that found evidence of an episode, a “whiff”, of oxygen some 50 million to 100 million years before the GOE. Analysis of samples obtained by deep-drilling into sedimentary rocks