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Yes. Polymetallic-nodule oxidation is a natural ocean process, not a laboratory-only reaction. In seawater and seafloor sediment, oxygen helps dissolved iron and manganese become insoluble oxide or oxyhydroxide minerals that accumulate in layers around a nucleus. That established chemistry is different from the newer, disputed claim that nodules can generate molecular oxygen in darkness.
What “polymetallic-nodule oxidation” means
Polymetallic nodules are rounded mineral accumulations that sit on sediment-covered parts of the deep-ocean floor. They usually begin around a nucleus such as a rock fragment, tooth, bone fragment or another hard particle. Dissolved metals from seawater or sediment porewater then precipitate as minerals and gradually build a layered nodule.
In this context, oxidation describes a change in the chemical state of dissolved metals when they react in an oxygen-bearing environment. Iron and manganese species become part of poorly soluble oxide or oxyhydroxide minerals. Those solids settle onto, or grow within, the nodule. The term does not mean that the nodule must produce free molecular oxygen (O2).
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Scan for outdated or missing drivers - takes under a minuteDriver Scan →Repair Windows errors before they cause bigger problemsFix Now →Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →The U.S. Geological Survey describes ocean-floor ferromanganese nodules and crusts as being composed mainly of iron and manganese oxide minerals precipitated from seawater, with some nodules also receiving material from deep-sea sediment porewater. Nodules are loose particles on sediment-covered abyssal plains; crusts are mineral pavements on exposed rock, so the terms are not interchangeable. See the U.S. Geological Survey overview.
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How nodules form in the ocean
Scientists generally describe two end-member growth pathways. Most natural nodules show a mixture rather than fitting perfectly into only one category.
Hydrogenetic growth from seawater
In hydrogenetic formation, seawater supplies the dissolved iron and manganese. Near the seafloor, oxygen promotes reactions that convert those dissolved metals into insoluble minerals. The precipitated material settles onto an existing nucleus and forms thin concentric layers. This process can operate directly in the water immediately above the sediment surface.
Hydrogenetic growth is associated with very slow accumulation. Smithsonian Ocean gives a general rate of about 1–5 millimeters per million years for hydrogenetic nodules; these are educational figures, not universal rates for every site or nodule. Its explanation of the process is available at Smithsonian Ocean.
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Diagenetic formation occurs within seafloor sediment. Organic matter decomposition and other reactions alter the chemistry of porewater, the water held between sediment grains. As porewater moves through changing redox zones, dissolved manganese and iron can be mobilized and then precipitate on a nodule when conditions become more oxidizing. Smithsonian Ocean reports diagenetic growth rates of up to 250 millimeters per million years, again as a general source figure rather than a guaranteed rate.
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Mixed growth
A single nodule can receive material from both pathways. Seawater may supply one layer while porewater contributes another, and the dominant source can change as the nodule moves, is buried, or experiences different sediment conditions. This mixed origin is why a nodule’s chemistry can contain information about both the overlying ocean and the sediment beneath it.
Where this natural oxidation occurs
Polymetallic-nodule fields occur in all major ocean regions, including the Atlantic, Indian, Southern and central Pacific oceans. Smithsonian Ocean gives a typical depth range of 3,960–5,790 meters (13,000–19,000 feet). At those depths, the relevant reactions occur in seawater, at the sediment-water interface and inside porewater—not only in a controlled laboratory vessel.
The surrounding environment controls which pathway dominates. Oxygen availability, the supply of dissolved metals, sediment accumulation, organic-matter breakdown, acidity and local circulation all affect where minerals precipitate and how quickly layers accumulate. Because these variables differ from one abyssal plain to another, no single growth rate or chemical recipe applies to every nodule.
What the oxidation chemistry does
At a simplified level, oxidation removes electrons from dissolved metal species or otherwise raises their oxidation state. Oxygen in seawater acts as an oxidizing influence, allowing iron and manganese to form solid minerals that are much less soluble than their dissolved precursors. Once formed, the particles can attach to a nucleus or to an older mineral layer.
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Manganese in deep-ocean nodules is predominantly in a highly oxidized form. A 1984 study by D.Z. Piper, J.R. Basler and J.L. Bischoff reported that more than 98% of the manganese in analyzed nodules was Mn(IV). The samples came from the Guatemala Basin, the North Pacific and central Pacific seamounts. The U.S. Geological Survey record for that work is “Oxidation state of marine manganese nodules”.
That result is evidence about the minerals that make up nodules, not evidence that the nodules manufacture oxygen gas. Oxygen can be consumed while dissolved metals are oxidized and deposited. Confusing those two meanings of “oxygen” is the source of many misleading explanations.
Natural nodule oxidation versus “dark oxygen”
Two different propositions are often combined under the word oxygen. The first is the established formation process: oxygen participates in oxidizing dissolved iron and manganese, producing mineral layers. The second is the claim that polymetallic nodules themselves cause oxygen concentrations to rise in complete darkness. The second proposition remains unsettled.
| Question | Established natural oxidation | Disputed dark-oxygen claim |
|---|---|---|
| What is observed? | Iron- and manganese-bearing oxide or oxyhydroxide minerals precipitate and accumulate on nodules. | Oxygen concentration increases were reported in dark benthic chambers and in laboratory incubations attributed to nodules. |
| Where does it occur? | Seawater, the sediment-water interface and sediment porewater on the ocean floor. | Experiments associated with the NORI-D licence area of the Clarion–Clipperton Zone and ex-situ incubations. |
| What is the proposed cause? | Oxidation of dissolved metals followed by mineral precipitation. | The 2024 authors proposed that electrical potentials on nodule surfaces might contribute to seawater electrolysis; that mechanism has not been demonstrated. |
| Scientific status | Part of the accepted explanation for nodule formation. | Observation, causal attribution and mechanism are being challenged in subsequent publications. |
What the 2024 dark-oxygen paper reported
Sweetman and colleagues’ 2024 Nature Geoscience paper, “Evidence of dark oxygen production at the abyssal seafloor,” reported in-situ benthic chamber experiments in the NORI-D licence area. Oxygen accumulated in the chambers over two days, and the paper reported levels rising to more than three times background in the experiments. The authors also described ex-situ incubations that they attributed to polymetallic nodules.
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The same paper reported measured voltage potentials on nodule surfaces of up to 0.95 volts. It hypothesized that such potentials might help split seawater through electrolysis, producing oxygen without sunlight. A measured voltage is not, by itself, proof that electrolysis generated the chamber oxygen, and the paper’s proposed mechanism should be treated as an interpretation rather than an established result. The original article is at Nature Geoscience.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Why the dark-oxygen interpretation is contested
Published experimental criticism
A 2025 article in Frontiers in Marine Science argued that the extraordinary dark-oxygen claim lacked adequate support. It discussed concerns about study design, interpretation, earlier observations of oxygen fluxes and the proposed electrolysis mechanism. Its criticism addresses whether the reported increases can be assigned specifically to nodules rather than to other physical, chemical or biological processes in the chambers. Read the article at Frontiers in Marine Science.
Later reanalysis
A 2026 F1000Research article, revised through 18 September, reanalyzed the benthic experiments and concluded that it found no established causal link between polymetallic nodules and the anomalous oxygen increases. This is a published reanalysis, not a claim that every question about the experiments has been permanently resolved. It is available at F1000Research.
Journal editorial status
The Nature Geoscience page for the original paper carries an editor’s note dated 8 April 2026: “Readers are alerted that aspects of this article are subject to concerns that are being considered by the Editors. A further editorial response will follow the resolution of these issues.” That notice records an active editorial review; it is not a retraction. The status could change if the editors issue a further response or if independent field work produces new evidence.
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How to evaluate claims about nodules and oxygen
When reading a headline or video claiming that nodules “make oxygen,” separate four questions:
- Was an oxygen increase measured? A chamber sensor can report a concentration change, but the measurement still needs calibration, controls and an explanation of possible contamination or gradients.
- Was the increase caused by nodules? Attribution requires controls that isolate nodules from sediment, chamber materials, microbial activity, transport and sampling effects.
- What mechanism was demonstrated? A voltage potential can motivate an electrolysis hypothesis, but demonstrating the voltage and demonstrating oxygen production by electrolysis are different experiments.
- What is the publication status? Look for independent replication, published criticism, reanalysis and any editorial notices. An editor’s concern is not the same as a completed retraction or a settled consensus.
These checks prevent a real observation from being expanded into a claim that the evidence does not yet establish.
Common points of confusion
“If oxidation uses oxygen, how can a nodule produce oxygen?”
Those are opposite directions of the chemical accounting. In ordinary nodule formation, oxygen helps convert dissolved metals into solid minerals and is not being described as a gas emitted by the nodule. A claim that oxygen gas is generated in darkness requires separate evidence for gas production and its source.
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“Does the presence of Mn(IV) prove dark oxygen?”
No. The finding that more than 98% of analyzed manganese was Mn(IV) documents the oxidation state of the mineral. It supports an oxidized mineral composition, not a mechanism for producing O2 in a dark chamber.
“Are all nodules formed at the same speed?”
No. Hydrogenetic and diagenetic processes can differ by orders of magnitude, and many nodules combine them. The commonly cited figures—about 1–5 millimeters per million years for hydrogenetic growth and up to 250 millimeters per million years for diagenetic growth—are broad educational estimates tied to the Smithsonian Ocean description, not universal constants.
Bottom line for readers
Polymetallic-nodule oxidation unquestionably happens outside a laboratory: it is part of the natural chemistry that precipitates iron- and manganese-bearing minerals on the deep seafloor. The separate idea that nodules generate “dark oxygen” is based on reported chamber observations and a proposed electrolysis mechanism, but its causal interpretation has been challenged by a 2025 critique, a 2026 reanalysis and an ongoing editorial notice at Nature Geoscience. Treat natural mineral oxidation as established; treat nodule-driven oxygen production in darkness as an unresolved scientific claim.
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