An international team of scientists have uncovered an important link between Earth's early atmosphere and the chemistry of its deep mantle.
The study, which was led by researchers at the University of Portsmouth and University of Montpellier, sheds new light on the evolution of life on our planet and the rise of atmospheric oxygen.
However, there has been little research into how atmospheric changes have left their mark on the Earth's mantle., examined the role of plate tectonics—the process by which our planet's outer shell moves and reshapes its surface—in cycling and exchanging elements between the atmosphere, Earth's surface, and the deep mantle. Until now, reliable methods to understand these interactions were elusive.
Lead author, Dr. Hugo Moreira from the University of Montpellier and visiting researcher at the University of Portsmouth, said,"With these findings, our understanding of Earth's ancient 'breath' has taken a significant leap forward. Not only does it provide crucial insights into Earth's geological evolution, but it also sheds light on how the deep Earth and itsare intimately connected to atmospheric changes.
The research team used the ID21 beamline at the European Synchrotron Radiation Facility in France to analyze sulfur state in minerals found in two-billion-year-old zircon crystals from the Mineiro Belt in Brazil, which acted as time capsules, preserving their original composition. They discovered that minerals from magmas that crystallized before the GOE had a reduced sulfur state. However, after the GOE, these became more oxidized.Dr.
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