Nature Geoscience Flags 2024 Dark Oxygen Paper as Critics Challenge 0.95-Volt Nodule Mechanism
Updated
Updated · spacedaily.com · Jul 2
Nature Geoscience Flags 2024 Dark Oxygen Paper as Critics Challenge 0.95-Volt Nodule Mechanism
1 articles · Updated · spacedaily.com · Jul 2
Summary
An April 8, 2026 editor’s note now appears on Nature Geoscience’s 2024 “dark oxygen” paper, warning that editors are reviewing concerns about the study.
The paper had reported oxygen rising inside sealed chambers on the Pacific seafloor about 4,000 meters deep, in some cases to more than three times background levels despite total darkness.
A 2025 critique said the evidence does not yet support nodule-driven oxygen production, citing no independent replication, no demonstrated energy source for electrolysis, and reported nodule voltages only up to 0.95 volts.
Critics argue the oxygen signal could be a chamber artifact—trapped air or oxygen-rich water during sealing—rather than a new geochemical process on polymetallic nodules.
The dispute matters because the Clarion-Clipperton Zone is a prime deep-sea mining target, and any real oxygen production around nodules would reshape assumptions about abyssal ecology.