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On impact and volcanism across the Cretaceous-Paleogene boundary

TitleOn impact and volcanism across the Cretaceous-Paleogene boundary
Publication TypeJournal Article
Year of Publication2020
AuthorsHull P.M, Bomemann A., Penman D.E, Henehan M.J, Norris RD, Wilson PA, Blum P., Alegret L., Batenburg S.J, Bown P.R, Bralower T.J, Cournede C., Deutsch A., Donner B., Friedrich O., Jehle S., Kim H, Kroon D., Lippert P.C, Loroch D., Moebius I., Moriya K., Peppe D.J, Ravizza G.E, Rohl U, Schueth J.D, Sepulveda J., Sexton PF, Sibert E.C, Sliwinska K.K, Summons R.E, Thomas E., Westerhold T., Whiteside J.H, Yamaguchi T., Zachos J.C
Date Published2020/01
Type of ArticleArticle
ISBN Number0036-8075
Accession NumberWOS:000509802700032
Keywordsastronomical time-scale; carbon-isotope; catastrophic mass extinction; danian faunal succession; deccan flood basalts; hell creek formation; k-t-boundary; large igneous provinces; marine os-187/os-188 record; planktonic foraminiferal response; Science & Technology - Other Topics; stratigraphy

The cause of the end-Cretaceous mass extinction is vigorously debated, owing to the occurrence of a very large bolide impact and flood basalt volcanism near the boundary. Disentangling their relative importance is complicated by uncertainty regarding kill mechanisms and the relative timing of volcanogenic outgassing, impact, and extinction We used carbon cycle modeling and paleotemperature records to constrain the timing of volcanogenic outgassing. We found support for major outgassing beginning and ending distinctly before the impact, with only the impact coinciding with mass extinction and biologically amplified carbon cycle change Our models show that these extinction-related carbon cycle changes would have allowed the ocean to absorb massive amounts of carbon dioxide, thus limiting the global warming otherwise expected from postextinction volcanism.

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