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The first day of th...
The first day of the Cenozoic
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- Gulick, Sean, P.S. (författare)
- University of Texas at Austin
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- Bralower, Timothy J. (författare)
- Pennsylvania State University
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- Ormö, Jens (författare)
- Instituto Nacional de Técnica Aeroespacial-Spanish National Research Council
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- Hall, Brendon (författare)
- Enthought, Inc.
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- Grice, Kliti (författare)
- Curtin University
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- Schaefer, Bettina (författare)
- Curtin University
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- Lyons, Shelby (författare)
- Pennsylvania State University
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- Freeman, Katherine (författare)
- Pennsylvania State University
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- Morgan, Joahha (författare)
- Imperial College London
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- Artemieva, Natalia (författare)
- Planetary Science Institute, Tucson
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- Kaskes, Pim (författare)
- Vrije Universiteit Brussel
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- de Graaff, Sietze (författare)
- Vrije Universiteit Brussel
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- Whalen, Michael T. (författare)
- University of Alaska Fairbanks
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- Collins, Gareth S. (författare)
- Imperial College London
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- Tikoo, Sonia M. (författare)
- Rutgers University
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- Verhagen, Christina (författare)
- Rutgers University
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- Christeson, Gail L. (författare)
- University of Texas at Austin
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- Claeys, Philippe (författare)
- Vrije Universiteit Brussel
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- Coolen, Marco J. L. (författare)
- Curtin University
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- Goderis, Steven (författare)
- Imperial College London
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- Goto, Kazuhisa (författare)
- Tohoku University
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- Grieve, Richard A. F. (författare)
- University of Western Ontario
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- McCall, Naoma (författare)
- University of Texas at Austin
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- Osinski, Gordon R. (författare)
- University of Western Ontario
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- Rae, Auriol S. P. (författare)
- Imperial College London
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- Riller, Ulrich (författare)
- Universität Hamburg
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- Smit, Jan (författare)
- Vrije Universiteit Amsterdam
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- Vajda, Vivi (författare)
- Naturhistoriska riksmuseet,Enheten för paleobiologi,Department of Geology, Lund University, Sweden
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- Wittmann, Axel (författare)
- Arizona State University
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(creator_code:org_t)
- 2019-09-09
- 2019
- Engelska.
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Ingår i: Proceedings of the National Academy of Sciences of the United States of America. - : US National Academy of Sciences. - 0027-8424 .- 1091-6490. ; 116, s. 19342-19351
- Relaterad länk:
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http://www.pnas.org/...
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https://nrm.diva-por... (primary) (Raw object)
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https://www.pnas.org...
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- 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 deposite 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.
Ämnesord
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Annan geovetenskap och miljövetenskap (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Other Earth and Related Environmental Sciences (hsv//eng)
Nyckelord
- Chicxulub impact crater
- suevite
- Cretaceous–Paleogene
- peak ring
- tsunami
- The changing Earth
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Gulick, Sean, P. ...
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Bralower, Timoth ...
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Ormö, Jens
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Hall, Brendon
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Grice, Kliti
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Schaefer, Bettin ...
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visa fler...
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Lyons, Shelby
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Freeman, Katheri ...
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Morgan, Joahha
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Artemieva, Natal ...
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Kaskes, Pim
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de Graaff, Sietz ...
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Whalen, Michael ...
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Collins, Gareth ...
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Tikoo, Sonia M.
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Verhagen, Christ ...
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Christeson, Gail ...
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Claeys, Philippe
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Coolen, Marco J. ...
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Goderis, Steven
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Goto, Kazuhisa
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Grieve, Richard ...
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McCall, Naoma
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Osinski, Gordon ...
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Rae, Auriol S. P ...
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Riller, Ulrich
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Smit, Jan
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Vajda, Vivi
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Wittmann, Axel
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