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dc.contributor.author
Kenny, Gavin G.
dc.contributor.author
Hyde, William R.
dc.contributor.author
Storey, Michael
dc.contributor.author
Garde, Adam A.
dc.contributor.author
Whitehouse, Martin J.
dc.contributor.author
Beck, Pierre
dc.contributor.author
Johansson, Leif
dc.contributor.author
Søndergaard, Anne Sofie
dc.contributor.author
MacGregor, Joseph A.
dc.contributor.author
Khan, Shfaqat A.
dc.contributor.author
Mouginot, Jérémie
dc.contributor.author
Johnson, Brandon C.
dc.contributor.author
Silber, Elizabeth A.
dc.contributor.author
Wielandt, Daniel K. P.
dc.contributor.author
Kjær, Kurt H.
dc.contributor.author
Larsen, Nicolaj K.
dc.date.accessioned
2022-05-31T09:29:44Z
dc.date.available
2022-03-17T04:27:44Z
dc.date.available
2022-05-31T09:29:44Z
dc.date.issued
2022-03-11
dc.identifier.issn
2375-2548
dc.identifier.other
10.1126/sciadv.abm2434
en_US
dc.identifier.uri
http://hdl.handle.net/20.500.11850/537537
dc.identifier.doi
10.3929/ethz-b-000537537
dc.description.abstract
The ~31-km-wide Hiawatha structure, located beneath Hiawatha Glacier in northwestern Greenland, has been proposed as an impact structure that may have formed after the Pleistocene inception of the Greenland Ice Sheet. To date the structure, we conducted 40Ar/39Ar analyses on glaciofluvial sand and U-Pb analyses on zircon separated from glaciofluvial pebbles of impact melt rock, all sampled immediately downstream of Hiawatha Glacier. Unshocked zircon in the impact melt rocks dates to ~1915 million years (Ma), consistent with felsic intrusions found in local bedrock. The 40Ar/39Ar data indicate Late Paleocene resetting and shocked zircon dates to 57.99 ± 0.54 Ma, which we interpret as the impact age. Consequently, the Hiawatha impact structure far predates Pleistocene glaciation and is unrelated to either the Paleocene-Eocene Thermal Maximum or flood basalt volcanism in east Greenland. However, it was contemporaneous with the Paleocene Carbon Isotope Maximum, although the impact's exact paleoenvironmental and climatic significance awaits further investigation.
en_US
dc.format
application/pdf
en_US
dc.language.iso
en
en_US
dc.publisher
AAAS
en_US
dc.rights.uri
http://creativecommons.org/licenses/by/4.0/
dc.title
A Late Paleocene age for Greenland's Hiawatha impact structure
en_US
dc.type
Journal Article
dc.rights.license
Creative Commons Attribution 4.0 International
dc.date.published
2022-03-09
ethz.journal.title
Science Advances
ethz.journal.volume
8
en_US
ethz.journal.issue
10
en_US
ethz.journal.abbreviated
Sci Adv
ethz.pages.start
eabm2434
en_US
ethz.size
11 p.
en_US
ethz.version.deposit
publishedVersion
en_US
ethz.identifier.scopus
ethz.publication.place
Washington, DC
en_US
ethz.publication.status
published
en_US
ethz.date.deposited
2022-03-17T04:28:01Z
ethz.source
SCOPUS
ethz.eth
yes
en_US
ethz.availability
Open access
en_US
ethz.rosetta.installDate
2022-05-31T09:29:52Z
ethz.rosetta.lastUpdated
2023-02-07T03:19:36Z
ethz.rosetta.versionExported
true
ethz.COinS
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