Evidence map›Paper›PMID 33441548›Full record

ArticleNature communications2021

A persistently low level of atmospheric oxygen in Earth's middle age.

Xiao-Ming Liu, Linda C Kah, Andrew H Knoll, Huan Cui, Chao Wang, Andrey Bekker, Robert M Hazen

Open access · goldAbstract read
In one paragraph

Article in Nature communications, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 20 papers.

0numbers the graph read from it
0cells of the map it votes in
20citing papers in PubMed
40.2field-weighted citation impact, top 1% of its field
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

20 citing papers in PubMed, 107 citations in OpenAlex.

  1. Review
  2. Article
  3. Article
  4. Biosphere expansion drives Earth's secular oxygenation while tectonics modulate oxygen variability revealed by machine learning.Proceedings of the National Academy of Sciences of the United States of America · 2026
    Article
  5. Atmospheric oxygen and methane on the early Earth.Philosophical transactions of the Royal Society of London. Series B, Biological sciences · 2025
    Review
  6. Article
  7. Article
  8. Review
  9. Article
  10. Article
  11. Article
  12. Constraining the oxygen requirements for modern microbial eukaryote diversity.Proceedings of the National Academy of Sciences of the United States of America · 2024
    Article
  13. Article
  14. Article
  15. Article
  16. Strong evidence for a weakly oxygenated ocean-atmosphere system during the Proterozoic.Proceedings of the National Academy of Sciences of the United States of America · 2022
    Article
  17. Triple oxygen isotope constraints on atmospheric OProceedings of the National Academy of Sciences of the United States of America · 2021
    Article
  18. Review
  19. Petrographic carbon in ancient sediments constrains Proterozoic Era atmospheric oxygen levels.Proceedings of the National Academy of Sciences of the United States of America · 2021
    Article
  20. Article
4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

7 authors at 6 institutions in 4 countries.

Xiao-Ming LiuDepartment of Geological Sciences, University of North Carolina, Chapel Hill, NC, 27599, USA. xiaomliu@unc.edu.
Linda C KahDepartment of Earth and Planetary Sciences, University of Tennessee, Knoxville, TN, 37996, USA.ORCID http://orcid.org/0000-0001-7172-2033
Andrew H KnollDepartment of Organismic and Evolutionary Biology, Harvard University, Cambridge, MA, 02138, USA.
Huan CuiDepartment of Earth Sciences, University of Toronto, Toronto, ON, M5S 3B1, Canada.
Chao WangDepartment of Geological Sciences, University of North Carolina, Chapel Hill, NC, 27599, USA.
Andrey BekkerDepartment of Earth and Planetary Sciences, University of California, Riverside, CA, 92521, USA.
Robert M HazenEarth and Planets Laboratory, Carnegie Institution for Science, Washington, DC, 20015, USA.
University of North Carolina at Chapel Hill · USCarnegie Institution for Science · USHarvard University · USInstitut de physique du globe de Paris · FRUniversity of California, Riverside · USUniversity of Tennessee at Knoxville · US

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

Resolving how Earth surface redox conditions evolved through the Proterozoic Eon is fundamental to understanding how biogeochemical cycles have changed through time. The redox sensitivity of cerium relative to other rare earth elements and its uptake in carbonate minerals make the Ce anomaly (Ce/Ce*) a particularly useful proxy for capturing redox conditions in the local marine environment. Here, we report Ce/Ce* data in marine carbonate rocks through 3.5 billion years of Earth's history, focusing in particular on the mid-Proterozoic Eon (i.e., 1.8 - 0.8 Ga). To better understand the role of atmospheric oxygenation, we use Ce/Ce* data to estimate the partial pressure of atmospheric oxygen (pO

Identifiers

PMID33441548
PMCPMC7806885
OpenAlexW3120679837

What OpenQuestion holds

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LicenceCC BY
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Registered trials

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Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.