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Metal deposits reveal how ice ages reshaped oxygen levels across Earth's oceans

Phys · · 651 words · By John H Tibbetts
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What to know about Metal deposits reveal how ice ages reshaped oxygen levels across Earth's oceans

Researchers analyzed over 27,000 ancient seafloor samples to determine how ice ages affected ocean oxygen levels. The study found that manganese gradients indicate polar oceans remained oxygen-rich while tropical oceans became oxygen-poor during major glaciations.

Propaganda risk 0%
Claims checked 10
Techniques found 0
Topics 0

Coverage spectrum

Coverage gap: Low Left coverage
Left0%
Center80%
Right20%

5 sources compared across this story cluster. This is an eFinder estimate from indexed source coverage, not an editorial rating.

What happened

Metal deposits reveal how ice ages reshaped oxygen levels across Earth's oceans Sadie Harley Scientific Editor Robert Egan Senior Editor Earth's oceans repeatedly lost oxygen and produced metal deposits during the planet's deepest ice ages.

Why it matters

An international team of researchers analyzed manganese and other chemical signatures preserved in more than 27,000 ancient seafloor samples collected from six continents.

Common ground

The findings, published in Nature Communications, suggest that ocean deoxygenation is not exclusively a consequence of warmer climate periods but has occurred under dramatically different climate conditions.

Perspective signals

No major persuasion pattern has been attached yet, so the source, headline, and evidence should carry most of the weight for readers.

Researchers analyzed over 27,000 ancient seafloor samples to determine how ice ages affected ocean oxygen levels. The study found that manganese gradients indicate polar oceans remained oxygen-rich while tropical oceans became oxygen-poor during major glaciations.

open_in_new Read the original article: https://phys.org/news/2026-08-metal-deposits-reveal-ice-ages.html

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0%
Propaganda Score
confidence: 100%
Low risk. This article shows minimal use of propaganda techniques.

fact_checkClaims Checked

eFinder analyzed this article and checked 10 claims against available evidence, cross-references, web search, and Wikipedia. Here is what the fact-checking layer found.

info Single Source 5
verified Verified 3
help Insufficient Evidence 2
verified
Claim 1: “Alexandre Pohl of Université de Bourgogne in France conducted ocean simulations using the cGENIE Earth system model.”
VERIFIED
The web search result 'A&S Researchers Link Metal Deposits to Oceanic Oxygen Loss During...' explicitly states that Alexandre Pohl of Université de Bourgogne conducted ocean simulations using the cGENIE Earth system model.
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wikipedia NEUTRAL — Background extinction rate (BER), also known as the normal extinction rate, refers to the standard rate of extinction in Earth's geological and biological history, excluding major extinction events, s…
https://en.wikipedia.org/wiki/Background_extinction_rate
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wikipedia NEUTRAL — The Late Ordovician mass extinction (LOME), sometimes referred to as the end-Ordovician mass extinction or the Ordovician–Silurian extinction, is the first of the "big five" major mass extinction even…
https://en.wikipedia.org/wiki/Late_Ordovician_mass_extinctio…
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wikipedia NEUTRAL — The Ordovician ( or-də-VISH-ee-ən, -⁠doh-, -⁠VISH-ən) is a geologic period and system, the second of six periods of the Paleozoic Era, and the second of twelve periods of the Phanerozoic Eon. The Ordo…
https://en.wikipedia.org/wiki/Ordovician
+ 3 more evidence sources
info
Claim 2: “Trace metals such as molybdenum and uranium, which respond in the opposite way to changing oxygen levels, displayed inverse latitudinal patterns”
SINGLE SOURCE
While evidence exists that molybdenum and uranium are used in geochemistry and respond to oxygen levels, the specific 'inverse latitudinal patterns' mentioned in the claim are not corroborated by multiple independent sources.
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web search NEUTRAL — Compare elements - Molybdenum and Uranium comparison table side by side across over 90 properties.The element Uranium was discovered by H. Klaproth in year 1789 in Germany. Uranium derived its name fr…
https://www.schoolmykids.com/learn/periodic-table/compare-mo…
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web search NEUTRAL — Comparative geochemistry of cadmium, rhenium, uranium, and molybdenum in continental margin sediments.
https://www.academia.edu/18815085/A_model_for_uranium_rheniu…
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web search NEUTRAL — Negative molybdenum isotope in manganese(II) carbonates points to manganese(IV) oxide reduction, acting as a molybdenum shuttle from oxygenated surface to euxinic deep waters.
https://www.nature.com/articles/s43247-024-01897-4?error=coo…
verified
Claim 3: “First author Xubin Wang, a postdoctoral researcher at Syracuse University, focused on manganese-rich marine sediments deposited during glaciations ranging from the Huronian Ice Age, roughly 2.4 billion years ago, to the Late Paleozoic Ice Age, which ended about 260 million years ago.”
VERIFIED
The web search result 'Metal deposits reveal how ice ages reshaped oxygen levels across...' explicitly confirms Xubin Wang's role as a postdoctoral researcher at Syracuse University and the specific time range of the glaciations studied (Huronian to Late Paleozoic).
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web search NEUTRAL — Before the Huronian Ice Age, most organisms were anaerobic, relying on chemosynthesis and retinal-based anoxygenic photosynthesis for production of biological energy and biocompounds.
https://en.wikipedia.org/wiki/Huronian_glaciation
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web search NEUTRAL — Latest news coverage, email, free stock quotes, live scores and video are just the beginning. Discover more every day at Yahoo!
https://www.answers.yahoo.com/
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web search NEUTRAL — First author Xubin Wang, a postdoctoral researcher at Syracuse University, focused on manganese-rich marine sediments deposited during glaciations ranging from the Huronian Ice Age, roughly 2.4 billio…
https://phys.org/news/2026-08-metal-deposits-reveal-ice-ages…
info
Claim 4: “Across six major glaciations spanning more than 2 billion years, researchers found the same pattern: Sediments from high latitudes consistently contained more manganese than those from tropical regions.”
SINGLE SOURCE
General evidence about glaciations exists, but the specific pattern of high-latitude sediments containing more manganese than tropical regions across six glaciations is not corroborated by multiple independent sources.
travel_explore
web search NEUTRAL — There were two main glacial periods within the Cryogenian, each lasting for about 20 million years: the Sturtian at around 700 Ma, and the Marinoan at 650 Ma. There is also evidence of some shorter gl…
https://opentextbc.ca/physicalgeologyh5p/chapter/glaciations…
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web search NEUTRAL — Although it ended 10 000 years ago, landscapes, sediments and the left-over ice caps remain as a treasure trove of data about the evolution of the world and its climate. But there have been other glac…
https://www.newscientist.com/article/1825450-secrets-of-a-tr…
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web search NEUTRAL — [Remove the batteries from the children's toy and power it directly with a DC power supply. Using a DC power supply that can supply up to 120V, we filmed the movement of the toy by gradually increasin…
https://www.youtube.com/watch?v=7Zrcz5tMbuA
help
Claim 5: “Xubin Wang et al, Latitudinal manganese gradient dynamics associated with Earth's major ice ages, Nature Communications (2026). DOI: 10.1038/s41467-026-75597-2”
INSUFFICIENT EVIDENCE
No evidence was found to confirm the publication of this specific paper in 2026 or the associated DOI.
info
Claim 6: “The findings, published in Nature Communications, suggest that ocean deoxygenation is not exclusively a consequence of warmer climate periods but has occurred under dramatically different climate conditions.”
SINGLE SOURCE
The provided evidence confirms that Nature Communications is a multidisciplinary journal covering earth sciences, but the specific finding regarding ocean deoxygenation not being exclusively a consequence of warmer climate periods is not corroborated by a second independent source.
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wikipedia NEUTRAL — Communications Chemistry is a peer-reviewed, open access, scientific journal in the field chemistry published by Nature Portfolio since 2018. The chief editor is Victoria Richards. Communications Chem…
https://en.wikipedia.org/wiki/Communications_Chemistry
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wikipedia NEUTRAL — Communications Physics is a peer-reviewed and open access, scientific journal in the field physics published by Nature Portfolio since 2018. The chief editor is Elena Belsole. It was created as a sub-…
https://en.wikipedia.org/wiki/Communications_Physics
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wikipedia NEUTRAL — Nature Communications is a peer-reviewed, open access, scientific journal published by Nature Portfolio since 2010. It is a multidisciplinary journal that covers the natural sciences, including physic…
https://en.wikipedia.org/wiki/Nature_Communications
+ 3 more evidence sources
help
Claim 7: “The strongest manganese gradients appeared during the Proterozoic Snowball Earth episodes”
INSUFFICIENT EVIDENCE
No evidence was found in the provided search results regarding manganese gradients during Proterozoic Snowball Earth episodes.
info
Claim 8: “An international team of researchers analyzed manganese and other chemical signatures preserved in more than 27,000 ancient seafloor samples collected from six continents.”
SINGLE SOURCE
While one web search result mentions manganese as a chemical archive and the study's focus on poles vs equator, the specific detail about '27,000 ancient seafloor samples collected from six continents' is not corroborated by a second independent source in the provided evidence.
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wikipedia NEUTRAL — Alzheimer's disease (AD) is a neurodegenerative disease and is the most common form of dementia, accounting for around 60–70% of cases. The most common early symptom is difficulty in remembering recen…
https://en.wikipedia.org/wiki/Alzheimer's_disease
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wikipedia NEUTRAL — Highly Cited Researchers is a list published annually by Clarivate of academic authors who in the past eleven years have authored multiple highly cited publications in academic journals indexed by Web…
https://en.wikipedia.org/wiki/Highly_Cited_Researchers
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wikipedia NEUTRAL — Research is creative and systematic work undertaken to increase the stock of knowledge. It involves the collection, organization, and analysis of evidence to increase understanding of a topic, charact…
https://en.wikipedia.org/wiki/Research
+ 3 more evidence sources
verified
Claim 9: “In oxygen-poor waters, the metal [manganese] dissolves into seawater. When oxygen returns, it precipitates and accumulates in seafloor sediments.”
VERIFIED
The evidence from 'A&S Researchers Link Metal Deposits to Oceanic Oxygen Loss During...' directly confirms the chemical process: manganese dissolves in oxygen-poor waters and precipitates when oxygen returns.
travel_explore
web search NEUTRAL — Manganese nodules are found scattered on the ocean floor. Though generally composed of manganese (hence the name), they can also be made of iron, nickel, copper, and other metals.
https://www.icr.org/article/manganese-nodule-discovery-point…
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web search NEUTRAL — Sea-floor sediments (and sedimentary rocks) can range in thickness from a few millimetres to several tens of kilometres.While calcite is insoluble in surface water, its solubility increases with depth…
https://opentextbc.ca/geology/chapter/18-3-sea-floor-sedimen…
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web search NEUTRAL — In oxygen-poor waters, the metal dissolves into seawater. When oxygen returns, it precipitates and accumulates in seafloor sediments. The study’s key advance was examining how manganese concentrations…
https://news.syr.edu/2026/07/31/as-researchers-link-metal-de…
info
Claim 10: “Those samples came from the Deep-Time Marine Sedimentary Element Database, which compiles data from North America, South America, Europe, Asia, Africa and Oceania.”
SINGLE SOURCE
The provided evidence contains general information about marine sediments and sample libraries, but does not specifically confirm the use of the 'Deep-Time Marine Sedimentary Element Database' for this specific study.
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wikipedia NEUTRAL — Clastic rocks are composed of fragments, or clasts, of pre-existing minerals and rock. A clast is a fragment of geological detritus, chunks, and smaller grains of rock broken off other rocks by physic…
https://en.wikipedia.org/wiki/Clastic_rock
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wikipedia NEUTRAL — Marine sediment, or ocean sediment, or seafloor sediment, are deposits of insoluble particles that have accumulated on the seafloor. These particles either have their origins in soil and rocks and hav…
https://en.wikipedia.org/wiki/Marine_sediment
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wikipedia NEUTRAL — Sedimentary rocks are types of rock formed by the cementation of sediments—i.e. particles made of minerals (geological detritus) or organic matter (biological detritus)—that have been accumulated or d…
https://en.wikipedia.org/wiki/Sedimentary_rock
+ 3 more evidence sources
info Disclaimer: This analysis is generated by AI and should be used as a starting point for critical thinking, not as definitive truth. Claims are verified against publicly available sources. Always consult the original article and additional sources for complete context.