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 40 Ar/ 39 Ar analyses on glaciofluvial sand an...
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Online Access: | https://curis.ku.dk/portal/da/publications/a-late-paleocene-age-for-greenlands-hiawatha-impact-structure(68dea451-b870-49cf-a850-954a3c14f767).html https://doi.org/10.1126/sciadv.abm2434 https://curis.ku.dk/ws/files/300984882/sciadv.abm2434.pdf |
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ftcopenhagenunip:oai:pure.atira.dk:publications/68dea451-b870-49cf-a850-954a3c14f767 2024-06-09T07:45:39+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 application/pdf https://curis.ku.dk/portal/da/publications/a-late-paleocene-age-for-greenlands-hiawatha-impact-structure(68dea451-b870-49cf-a850-954a3c14f767).html https://doi.org/10.1126/sciadv.abm2434 https://curis.ku.dk/ws/files/300984882/sciadv.abm2434.pdf eng eng info:eu-repo/semantics/openAccess Kenny , G G , Hyde , W R , Storey , M , Garde , A A , Whitehouse , M J , Beck , P , Johansson , L , Søndergaard , A S , Bjørk , A A , MacGregor , J A , Khan , S A , Mouginot , J , Johnson , B C , Silber , E A , Wielandt , D K P , Kjær , K H & Larsen , N K 2022 , ' A Late Paleocene age for Greenland's Hiawatha impact structure ' , Science Advances , vol. 8 , no. 10 , eabm2434 . https://doi.org/10.1126/sciadv.abm2434 article 2022 ftcopenhagenunip https://doi.org/10.1126/sciadv.abm2434 2024-05-16T11:29:23Z 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 40 Ar/ 39 Ar 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 40 Ar/ 39 Ar 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 University of Copenhagen: Research Greenland Science Advances 8 10 |
institution |
Open Polar |
collection |
University of Copenhagen: Research |
op_collection_id |
ftcopenhagenunip |
language |
English |
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 40 Ar/ 39 Ar 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 40 Ar/ 39 Ar 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. |
spellingShingle |
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 |
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 |
publishDate |
2022 |
url |
https://curis.ku.dk/portal/da/publications/a-late-paleocene-age-for-greenlands-hiawatha-impact-structure(68dea451-b870-49cf-a850-954a3c14f767).html https://doi.org/10.1126/sciadv.abm2434 https://curis.ku.dk/ws/files/300984882/sciadv.abm2434.pdf |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
East Greenland glacier Greenland Ice Sheet |
genre_facet |
East Greenland glacier Greenland Ice Sheet |
op_source |
Kenny , G G , Hyde , W R , Storey , M , Garde , A A , Whitehouse , M J , Beck , P , Johansson , L , Søndergaard , A S , Bjørk , A A , MacGregor , J A , Khan , S A , Mouginot , J , Johnson , B C , Silber , E A , Wielandt , D K P , Kjær , K H & Larsen , N K 2022 , ' A Late Paleocene age for Greenland's Hiawatha impact structure ' , Science Advances , vol. 8 , no. 10 , eabm2434 . https://doi.org/10.1126/sciadv.abm2434 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1126/sciadv.abm2434 |
container_title |
Science Advances |
container_volume |
8 |
container_issue |
10 |
_version_ |
1801375128036048896 |