Molten Basalt Absorbs Oxygen Under Extreme Pressure
Deep-mantle magma may have acted as a massive oxygen reservoir, impacting early atmospheric composition.
Updated on Oct. 23, 2026 in Geology
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Should the discovery of deep-earth oxygen sources influence our understanding of planetary habitability?
Published in National Science Review on August 25, 2026, a new study reveals that molten basalt can store excess oxygen under extreme pressures. This research identifies a mechanism by which deep-mantle magma may have acted as an oxygen reservoir, potentially influencing atmospheric composition billions of years ago.
Why it matters
Understanding how magma transports oxidizing power provides a new geological explanation for the rise of atmospheric oxygen between 2.5 and 2.0 billion years ago. This discovery shifts the focus toward the mantle as a dynamic driver of Earth's surface chemistry.
Researchers observed that oxygen solubility increases with pressure, reaching 5% of sample weight at 7 gigapascals (approximately 1 million pounds per square inch). Control experiments lacking added platinum oxide consistently yielded only 0.2% to 0.5% oxygen by weight.
The players
Center for High Pressure Science and Technology Advanced Research
A research institution specializing in experimental high-pressure physics and materials science.
The details
To simulate deep-mantle conditions, scientists melted synthetic mid-ocean ridge basalt at temperatures between 1,200 and 1,800 °C. The team added platinum oxide to create an oxygen-rich environment, using Raman spectroscopy—a technique that uses laser light to identify chemical bonds—to confirm no oxygen gas bubbles were present in the cooled glass. Atomic simulations suggest this absorbed oxygen forms peroxide-like bonds within the melt, allowing the magma to carry significantly more oxidizing potential than previously calculated.
Timeline
August 25, 2026: Study published in National Science Review.
2.5 to 2.0 billion years ago: Period of major atmospheric oxygen increases.
The Tech Race
This study offers a new geological variable to the long-standing debate regarding the Great Oxidation Event. It challenges traditional models by demonstrating that the mantle could have served as a massive, hidden oxygen source rather than just a sink.
This research provides planetary scientists and geologists with a new data point to refine models of Earth's atmospheric history. It changes the current framework for interpreting geological samples by accounting for previously ignored oxygen-storage capacities in deep-earth magma.
The takeaway
The discovery of peroxide-like oxygen bonds in high-pressure basalt alters the scientific consensus on how planetary atmospheres evolve over billions of years. Researchers can now look for geochemical signatures of this deep-mantle transport to confirm the extent of its role in Earth's past.
Further reading
Explore more findings in Geology regarding the chemical evolution of the Earth.
More information
Access the technical findings in the study published in National Science Review.
Source note: This article includes information reported by SciTechDaily.
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Should the discovery of deep-earth oxygen sources influence our understanding of planetary habitability?
