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Microbes living beneath the Red Sea in dark, oxygen-depleted brine pools leave metal-rich traces in the seafloor. A 2026 study found manganese, iron, molybdenum, and copper enrichment in sediments from an active pool and a suspected extinct one. The pattern offers clues about how ancient microbes might have obtained energy, but it does not prove how life began or what powered it.
What is a brine pool?
A brine pool is a lake-like body of very salty, dense water resting on the seafloor. Its sharp boundary with surrounding seawater can make it look like a lake with a shoreline. The Red Sea pools in the study are deep, dark, and oxygen-depleted environments; “death pool” is a dramatic nickname, not a claim that nothing can live there.
Microbial communities can inhabit these environments. Their activity and the chemistry of the surrounding sediments can leave traces that persist after conditions change, making brine pools useful places to investigate how microbes interact with metals.
What did the Red Sea study find?
In a 2026 study published in AGU Advances, researchers examined sediment geochemistry and organic matter and characterized microbial communities using metagenomics and metatranscriptomics. They analyzed an active brine pool, three non-brine seafloor comparison sites, and a location suspected to be an extinct brine pool. The active pool is 1,770 meters below the Red Sea surface; the suspected extinct site is nearly 1,400 meters deep.
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- Sediments beneath a microbial mat in the active pool were enriched in manganese, iron, molybdenum, and copper compared with the non-brine sites. Some concentrations were more than 100 times those in the comparisons; that figure applies to some areas, not every sample.
- The suspected extinct pool showed similar enrichment patterns.
- Researchers reported oxidized manganese and iron phases, as well as molybdenum-enriched organic matter, in sediments from both pools.
- Metagenomic analysis of the active pool identified manganese oxidizers, including Nitrospira.
The results connect microbial communities with metal-rich sediment chemistry. They do not establish that the same processes occurred in the ancient ocean.
How could microbes use metals for energy?
Microbes can obtain energy through chemical reactions involving substances in their environment. The researchers propose that oxidation of metals such as manganese and iron may have offered microbes an energy source in oceans with little oxygen. In this context, oxidation means a chemical reaction that involves electron transfer; it need not require free oxygen gas.
The metal-enriched sediments and manganese-oxidizing microbes make that possibility worth investigating. But finding microbes and oxidation products in a modern pool does not by itself show which reactions supplied energy to ancient organisms, or whether those reactions were widespread.
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The study offers a possible way to interpret chemical traces in ancient rocks: metal enrichment and oxidation patterns may preserve clues to microbial activity and potential energy sources. The researchers frame metal-based metabolism as a hypothesis for oxygen-poor early oceans, not a demonstrated account of life’s origin.
The report places this possibility in the period before the Great Oxidation Event, roughly 2.4–2.2 billion years ago. That is geological context, not an age measured from the modern Red Sea pools. The study did not directly compare present-day pool measurements with samples of ancient seawater, and modern brines are not established as exact replicas of the early ocean.
How the comparison sites help—and what they cannot show
The non-brine seafloor sites provide a reference for identifying sediment enrichment associated with the brine environments. The active pool also offers microbial evidence, while the suspected extinct pool helps researchers consider whether chemical patterns can remain after a pool is no longer active.
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| Site type | What the study reports | What the comparison contributes |
|---|---|---|
| Active Red Sea brine pool | At 1,770 meters deep; microbial communities were characterized, including manganese oxidizers such as Nitrospira; sediments beneath a microbial mat were enriched in manganese, iron, molybdenum, and copper. | Links a living microbial community with metal-rich sediment chemistry. |
| Suspected extinct brine pool | Nearly 1,400 meters deep; similar metal-enrichment patterns and oxidized manganese and iron phases were reported. | Shows that comparable chemical traces occur at a site inferred to be an extinct pool. |
| Three non-brine seafloor sites | Used as comparison sites for sediment metal concentrations. | Provide a baseline against which enrichment in the brine settings was assessed. |
The comparison supports an association between brine-pool settings and the reported sediment chemistry. It does not establish that a particular metal reaction powered early life, nor that every enriched sample formed through microbial activity.
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What remains uncertain?
- The results are evidence consistent with microbial metal oxidation, not proof that this metabolism powered the origin of life.
- The reported enrichment exceeding 100 times applies to some areas relative to the non-brine comparisons, not uniformly to every sample.
- The suspected extinct pool is identified as such by inference; the findings do not make it a direct record of ancient ocean conditions.
- The reported observations do not settle how common metal-based energy production was in early oceans or how it related to the rise of oxygen.
The study is Chakraborty et al., “Brine Pool Microbes Enrich Metalliferous Sediments in Salt Giant Basins,” AGU Advances (2026), DOI 10.1029/2026av002570. The findings are described in AGU Eos and a corroborating Phys.org report.
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