A Late Paleocene age for Greenland's Hiawatha impact structure
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...
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American Association for the Advancement of Science (AAAS)
2022
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Online Access: | https://lup.lub.lu.se/record/ed6adca1-c61b-486d-8e06-ad3e5fac8130 https://doi.org/10.1126/sciadv.abm2434 |
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ftulundlup:oai:lup.lub.lu.se:ed6adca1-c61b-486d-8e06-ad3e5fac8130 2024-05-19T07:39:36+00:00 A Late Paleocene age for Greenland's Hiawatha impact structure Kenny, Gavin G. Hyde, William R. Storey, Michael Garde, Adam A. Whitehouse, Martin J. Beck, Pierre Johansson, Leif Søndergaard, Anne Sofie Bjørk, Anders A. MacGregor, Joseph A. Khan, Shfaqat A. Mouginot, Jérémie Johnson, Brandon C. Silber, Elizabeth A. Wielandt, Daniel K.P. Kjær, Kurt H. Larsen, Nicolaj K. 2022-03 https://lup.lub.lu.se/record/ed6adca1-c61b-486d-8e06-ad3e5fac8130 https://doi.org/10.1126/sciadv.abm2434 eng eng American Association for the Advancement of Science (AAAS) https://lup.lub.lu.se/record/ed6adca1-c61b-486d-8e06-ad3e5fac8130 http://dx.doi.org/10.1126/sciadv.abm2434 scopus:85126080454 pmid:35263140 Science Advances; 8(10), no eabm2434 (2022) ISSN: 2375-2548 Geology contributiontojournal/article info:eu-repo/semantics/article text 2022 ftulundlup https://doi.org/10.1126/sciadv.abm2434 2024-04-23T23:58:21Z 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. Article in Journal/Newspaper East Greenland glacier Greenland Ice Sheet Lund University Publications (LUP) Science Advances 8 10 |
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Open Polar |
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Lund University Publications (LUP) |
op_collection_id |
ftulundlup |
language |
English |
topic |
Geology |
spellingShingle |
Geology Kenny, Gavin G. Hyde, William R. Storey, Michael Garde, Adam A. Whitehouse, Martin J. Beck, Pierre Johansson, Leif Søndergaard, Anne Sofie Bjørk, Anders A. MacGregor, Joseph A. Khan, Shfaqat A. Mouginot, Jérémie Johnson, Brandon C. Silber, Elizabeth A. Wielandt, Daniel K.P. Kjær, Kurt H. Larsen, Nicolaj K. A Late Paleocene age for Greenland's Hiawatha impact structure |
topic_facet |
Geology |
description |
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. |
format |
Article in Journal/Newspaper |
author |
Kenny, Gavin G. Hyde, William R. Storey, Michael Garde, Adam A. Whitehouse, Martin J. Beck, Pierre Johansson, Leif Søndergaard, Anne Sofie Bjørk, Anders A. MacGregor, Joseph A. Khan, Shfaqat A. Mouginot, Jérémie Johnson, Brandon C. Silber, Elizabeth A. Wielandt, Daniel K.P. Kjær, Kurt H. Larsen, Nicolaj K. |
author_facet |
Kenny, Gavin G. Hyde, William R. Storey, Michael Garde, Adam A. Whitehouse, Martin J. Beck, Pierre Johansson, Leif Søndergaard, Anne Sofie Bjørk, Anders A. MacGregor, Joseph A. Khan, Shfaqat A. Mouginot, Jérémie Johnson, Brandon C. Silber, Elizabeth A. Wielandt, Daniel K.P. Kjær, Kurt H. Larsen, Nicolaj K. |
author_sort |
Kenny, Gavin G. |
title |
A Late Paleocene age for Greenland's Hiawatha impact structure |
title_short |
A Late Paleocene age for Greenland's Hiawatha impact structure |
title_full |
A Late Paleocene age for Greenland's Hiawatha impact structure |
title_fullStr |
A Late Paleocene age for Greenland's Hiawatha impact structure |
title_full_unstemmed |
A Late Paleocene age for Greenland's Hiawatha impact structure |
title_sort |
late paleocene age for greenland's hiawatha impact structure |
publisher |
American Association for the Advancement of Science (AAAS) |
publishDate |
2022 |
url |
https://lup.lub.lu.se/record/ed6adca1-c61b-486d-8e06-ad3e5fac8130 https://doi.org/10.1126/sciadv.abm2434 |
genre |
East Greenland glacier Greenland Ice Sheet |
genre_facet |
East Greenland glacier Greenland Ice Sheet |
op_source |
Science Advances; 8(10), no eabm2434 (2022) ISSN: 2375-2548 |
op_relation |
https://lup.lub.lu.se/record/ed6adca1-c61b-486d-8e06-ad3e5fac8130 http://dx.doi.org/10.1126/sciadv.abm2434 scopus:85126080454 pmid:35263140 |
op_doi |
https://doi.org/10.1126/sciadv.abm2434 |
container_title |
Science Advances |
container_volume |
8 |
container_issue |
10 |
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1799479178233380864 |