ArticleProceedings of the National Academy of Sciences of the United States of America2020
Molecular and isotopic evidence reveals the end-Triassic carbon isotope excursion is not from massive exogenous light carbon.
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 5 papers.
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5 citing papers in PubMed, 55 citations in OpenAlex.
- Metabolic controls on the carbon isotope fractionations of bacterial fermentation.Proceedings of the National Academy of Sciences of the United States of America · 2025Article
- Mechanisms of global climate change during the five major mass extinctions.Scientific reports · 2025Article
- Correlation of sub-centennial-scale pulses of initial Central Atlantic Magmatic Province lavas and the end-Triassic extinctions.Proceedings of the National Academy of Sciences of the United States of America · 2024Article
- Isotopic Signatures of Carbon Transfer in a Proterozoic Analogue Microbial Mat.Applied and environmental microbiology · 2023Article
- Arctic ice and the ecological rise of the dinosaurs.Science advances · 2022Article
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6 authors at 6 institutions in 5 countries.
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Abstract
The negative organic carbon isotope excursion (CIE) associated with the end-Triassic mass extinction (ETE) is conventionally interpreted as the result of a massive flux of isotopically light carbon from exogenous sources into the atmosphere (e.g., thermogenic methane and/or methane clathrate dissociation linked to the Central Atlantic Magmatic Province [CAMP]). Instead, we demonstrate that at its type locality in the Bristol Channel Basin (UK), the CIE was caused by a marine to nonmarine transition resulting from an abrupt relative sea level drop. Our biomarker and compound-specific carbon isotopic data show that the emergence of microbial mats, influenced by an influx of fresh to brackish water, provided isotopically light carbon to both organic and inorganic carbon pools in centimeter-scale water depths, leading to the negative CIE. Thus, the iconic CIE and the disappearance of marine biota at the type locality are the result of local environmental change and do not mark either the global extinction event or input of exogenous light carbon into the atmosphere. Instead, the main extinction phase occurs slightly later in marine strata, where it is coeval with terrestrial extinctions and ocean acidification driven by CAMP-induced increases in
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