Imperial College London
Alternate

ProfessorJoannaMorgan

Faculty of Engineering, Department of Earth Science & Engineering

Emeritus Professor of Geophysics
 
 
 
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Contact

 

+44 (0)20 7594 6423j.v.morgan

 
 
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Location

 

1.46CRoyal School of MinesSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Gulick:2019:10.1073/pnas.1909479116,
author = {Gulick, SPS and Bralower, T and Ormö, J and Hall, B and Grice, K and Schaefer, B and Lyons, S and Freeman, KH and Morgan, J and Artemieva, N and Kaskes, P and de, Graaff SJ and Whalen, M and Collins, G and Tikoo, SM and Verhagen, C and Christeson, GL and Claeys, P and Coolen, M and Goderis, S and Goto, K and Grieve, R and McCall, N and Osinski, G and Rae, A and Riller, U and Smit, J and Vajda, V and Wittmann, A and and, the Expedition 364 Scientists},
doi = {10.1073/pnas.1909479116},
journal = {Proceedings of the National Academy of Sciences of the United States of America},
pages = {19342--19351},
title = {The first day of the Cenozoic},
url = {http://dx.doi.org/10.1073/pnas.1909479116},
volume = {116},
year = {2019}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - 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.
AU  - Gulick,SPS
AU  - Bralower,T
AU  - Ormö,J
AU  - Hall,B
AU  - Grice,K
AU  - Schaefer,B
AU  - Lyons,S
AU  - Freeman,KH
AU  - Morgan,J
AU  - Artemieva,N
AU  - Kaskes,P
AU  - de,Graaff SJ
AU  - Whalen,M
AU  - Collins,G
AU  - Tikoo,SM
AU  - Verhagen,C
AU  - Christeson,GL
AU  - Claeys,P
AU  - Coolen,M
AU  - Goderis,S
AU  - Goto,K
AU  - Grieve,R
AU  - McCall,N
AU  - Osinski,G
AU  - Rae,A
AU  - Riller,U
AU  - Smit,J
AU  - Vajda,V
AU  - Wittmann,A
AU  - and,the Expedition 364 Scientists
DO  - 10.1073/pnas.1909479116
EP  - 19351
PY  - 2019///
SN  - 0027-8424
SP  - 19342
TI  - The first day of the Cenozoic
T2  - Proceedings of the National Academy of Sciences of the United States of America
UR  - http://dx.doi.org/10.1073/pnas.1909479116
UR  - https://www.pnas.org/content/116/39/19342
UR  - http://hdl.handle.net/10044/1/72599
VL  - 116
ER  -
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