ArticleProceedings of the National Academy of Sciences of the United States of America2020
Organic matter from the Chicxulub crater exacerbated the K-Pg impact winter.
Article in Proceedings of the National Academy of Sciences of the United States of America, 2020. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 8 papers.
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Who cites it
8 citing papers in PubMed.
- Co-evolution of wildfires and earlyCommunications earth & environment · 2026Article
- Reduced contribution of sulfur to the mass extinction associated with the Chicxulub impact event.Nature communications · 2025Article
- Role of volcanism and impact heating in mass extinction climate shifts.Scientific reports · 2024Article
- Article
- The end-Cretaceous plant extinction: Heterogeneity, ecosystem transformation, and insights for the future.Cambridge prisms. Extinction · 2023Review
- The Nadir Crater offshore West Africa: A candidate Cretaceous-Paleogene impact structure.Science advances · 2022Article
- Timing and causes of forest fire at the K-Pg boundary.Scientific reports · 2022Article
- Massive perturbations to atmospheric sulfur in the aftermath of the Chicxulub impact.Proceedings of the National Academy of Sciences of the United States of America · 2022Article
Corrections and comments
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Authors and funding
8 authors.
Funding
No grant is acknowledged in the PubMed record.
Abstract
An asteroid impact in the Yucatán Peninsula set off a sequence of events that led to the Cretaceous-Paleogene (K-Pg) mass extinction of 76% species, including the nonavian dinosaurs. The impact hit a carbonate platform and released sulfate aerosols and dust into Earth's upper atmosphere, which cooled and darkened the planet-a scenario known as an impact winter. Organic burn markers are observed in K-Pg boundary records globally, but their source is debated. If some were derived from sedimentary carbon, and not solely wildfires, it implies soot from the target rock also contributed to the impact winter. Characteristics of polycyclic aromatic hydrocarbons (PAHs) in the Chicxulub crater sediments and at two deep ocean sites indicate a fossil carbon source that experienced rapid heating, consistent with organic matter ejected during the formation of the crater. Furthermore, PAH size distributions proximal and distal to the crater indicate the ejected carbon was dispersed globally by atmospheric processes. Molecular and charcoal evidence indicates wildfires were also present but more delayed and protracted and likely played a less acute role in biotic extinctions than previously suggested. Based on stratigraphy near the crater, between 7.5 × 10
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