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The first day of the cenozoic

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Title: The first day of the cenozoic
Authors: Gulick, SPS
Bralower, T
Ormö, J
Hall, B
Grice, K
Schaefer, B
Lyons, S
Freeman, KH
Morgan, J
Artemieva, N
Kaskes, P
De Graaff, SJ
Whalen, M
Collins, G
Tikoo, SM
Verhagen, C
Christeson, GL
Claeys, P
Coolen, M
Goderis, S
Goto, K
Grieve, R
McCall, N
Osinski, G
Rae, A
Riller, U
Smit, J
Vajda, V
Wittmann, A
And the Expedition 364 Scientists
Item Type: Journal Article
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 form a peak ring capped in melt rock. Within tens of minutes, the peak ring was covered in ∼40 m of brecciated impact melt rock and coarse-grained 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 impact-induced wildfires and a paucity of sulfur-rich evaporites from the target supporting rapid global cooling and darkness as extinction mechanisms.
Issue Date: 24-Sep-2019
Date of Acceptance: 30-Jul-2019
URI: http://hdl.handle.net/10044/1/72599
DOI: https://dx.doi.org/10.1073/pnas.1909479116
ISSN: 0027-8424
Publisher: National Academy of Sciences
Start Page: 19342
End Page: 19351
Journal / Book Title: Proceedings of the National Academy of Sciences
Volume: 116
Issue: 39
Copyright Statement: © 2019 The Author(s). Published under the PNAS license.
Sponsor/Funder: Natural Environment Research Council (NERC)
Natural Environment Research Council (NERC)
Funder's Grant Number: NE/P011195/1
NE/P005217/1
Keywords: Science & Technology
Multidisciplinary Sciences
Science & Technology - Other Topics
Chicxulub impact crater
suevite
Cretaceous-Paleogene
peak ring
tsunami
CRETACEOUS-PALEOGENE BOUNDARY
POLYCYCLIC AROMATIC-HYDROCARBONS
SUEVITE REVISITED-OBSERVATIONS
CHICXULUB IMPACT EVENT
GULF-OF-MEXICO
TERTIARY BOUNDARY
ONAPING FORMATION
ASTEROID IMPACT
RIES CRATER
EXTINCTION
Chicxulub impact crater
Cretaceous–Paleogene
peak ring
suevite
tsunami
Expedition 364 Scientists
Publication Status: Published
Embargo Date: 2020-03-09
Online Publication Date: 2019-09-09
Appears in Collections:Faculty of Engineering
Earth Science and Engineering



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