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    The first day of the Cenozoic

    Access Status
    Open access via publisher
    Authors
    Gulick, S.P.S.
    Bralower, T.J.
    Ormö, J.
    Hall, B.
    Grice, Kliti
    Schaefer, Bettina
    Lyons, S.
    Freeman, K.H.
    Morgan, J.V.
    Artemieva, N.
    Kaskes, P.
    De Graaff, S.J.
    Whalen, M.T.
    Collins, G.S.
    Tikoo, S.M.
    Verhagen, C.
    Christeson, G.L.
    Claeys, P.
    Coolen, Marco
    Goderis, S.
    Goto, K.
    Grieve, R.A.F.
    McCall, N.
    Osinski, G.R.
    Rae, A.S.P.
    Riller, U.
    Smit, J.
    Vajda, V.
    Wittmann, A.
    Date
    2019
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Gulick, S.P.S. and Bralower, T.J. and Ormö, J. and Hall, B. and Grice, K. and Schaefer, B. and Lyons, S. et al. 2019. The first day of the Cenozoic. Proceedings of the National Academy of Sciences of the United States of America. 116 (39): pp. 19342-19351.
    Source Title
    Proceedings of the National Academy of Sciences of the United States of America
    DOI
    10.1073/pnas.1909479116
    Additional URLs
    https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6765282/
    ISSN
    0027-8424
    Faculty
    Faculty of Science and Engineering
    School
    School of Earth and Planetary Sciences (EPS)
    Funding and Sponsorship
    http://purl.org/au-research/grants/arc/DP180100982
    URI
    http://hdl.handle.net/20.500.11937/90119
    Collection
    • Curtin Research Publications
    Abstract

    Highly expanded Cretaceous-Paleogene (K-Pg) boundary section from the Chicxulub peak ring, recovered by International Ocean Discovery Program (IODP)-International Continental Scientific Drilling Program (ICDP) Expedition 364, provides an unprecedented window into the immediate aftermath of the impact. Site M0077 includes ∼130 m of impact melt rock and suevite deposited the first day of the Cenozoic covered by <1 m of micrite-rich carbonate deposited over subsequent weeks to years. We present an interpreted series of events based on analyses of these drill cores. Within minutes of the impact, centrally uplifted basement rock collapsed outward to forma peak ring capped in melt rock. Within tens of minutes, the peak ring was covered in ∼40 m of brecciated impact melt rock and coarsegrained suevite, including clasts possibly generated by melt-water interactions during ocean resurge. Within an hour, resurge crested the peak ring, depositing a 10-m-thick layer of suevite with increased particle roundness and sorting.Within hours, the full resurge deposit formed through settling and seiches, resulting in an 80-m-thick fining-upward, sorted suevite in the flooded crater. Within a day, the reflected rim-wave tsunami reached the crater, depositing a cross-bedded sand-to-fine gravel layer enriched in polycyclic aromatic hydrocarbons overlain by charcoal fragments. Generation of a deep crater open to the ocean allowed rapid flooding and sediment accumulation rates among the highest known in the geologic record. The high-resolution section provides insight into the impact environmental effects, including charcoal as evidence for impactinduced wildfires and a paucity of sulfur-rich evaporites from the target supporting rapid global cooling and darkness as extinction mechanisms.

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