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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ETH Zurich
2022
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Online Access: | https://dx.doi.org/10.3929/ethz-b-000537537 http://hdl.handle.net/20.500.11850/537537 |
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ftdatacite:10.3929/ethz-b-000537537 2024-04-28T08:17:24+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 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://dx.doi.org/10.3929/ethz-b-000537537 http://hdl.handle.net/20.500.11850/537537 en eng ETH Zurich article-journal Text ScholarlyArticle Journal Article 2022 ftdatacite https://doi.org/10.3929/ethz-b-000537537 2024-04-02T12:32:08Z 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 ... : Science Advances, 8 (10) ... Article in Journal/Newspaper East Greenland glacier Greenland Ice Sheet DataCite Metadata Store (German National Library of Science and Technology) |
institution |
Open Polar |
collection |
DataCite Metadata Store (German National Library of Science and Technology) |
op_collection_id |
ftdatacite |
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 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 ... : Science Advances, 8 (10) ... |
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 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 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 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 |
ETH Zurich |
publishDate |
2022 |
url |
https://dx.doi.org/10.3929/ethz-b-000537537 http://hdl.handle.net/20.500.11850/537537 |
genre |
East Greenland glacier Greenland Ice Sheet |
genre_facet |
East Greenland glacier Greenland Ice Sheet |
op_doi |
https://doi.org/10.3929/ethz-b-000537537 |
_version_ |
1797582019580919808 |