A large impact crater beneath Hiawatha Glacier in northwest Greenland
International audience We report the discovery of a large impact crater beneath Hiawatha Glacier in northwest Greenland. From airborne radar surveys, we identify a 31-kilometer-wide, circular bedrock depression beneath up to a kilometer of ice. This depression has an elevated rim that cross-cuts tri...
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Online Access: | https://hal.science/hal-02392102 https://hal.science/hal-02392102/document https://hal.science/hal-02392102/file/eaar8173.full.pdf https://doi.org/10.1126/sciadv.aar8173 |
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ftunigrenoble:oai:HAL:hal-02392102v1 2024-05-12T08:03:59+00:00 A large impact crater beneath Hiawatha Glacier in northwest Greenland Kjær, Kurt Larsen, Nicolaj Binder, Tobias Björk, Anders Eisen, Olaf Fahnestock, Mark Funder, Svend Garde, Adam Haack, Henning Helm, Veit Houmark-Nielsen, Michael Kjeldsen, Kristian Khan, Shfaqat Machguth, Horst Mcdonald, Iain Morlighem, Mathieu Mouginot, Jérémie Paden, John Waight, Tod Weikusat, Christian Willerslev, Eske Macgregor, Joseph, J Abteilung Klinische Sozialmedizin, Berufs- und Umweltdermatologie Universität Heidelberg Heidelberg = Heidelberg University Centre for Star and Planet Formation (STARPLAN) Globe Institute Faculty of Health and Medical Sciences University of Copenhagen = Københavns Universitet (UCPH)-University of Copenhagen = Københavns Universitet (UCPH)-Faculty of Health and Medical Sciences University of Copenhagen = Københavns Universitet (UCPH)-University of Copenhagen = Københavns Universitet (UCPH) Jodrell Bank Centre for Astrophysics (JBCA) University of Manchester Manchester Institut des Géosciences de l’Environnement (IGE) Institut de Recherche pour le Développement (IRD)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes 2016-2019 (UGA 2016-2019 ) University of California Irvine (UC Irvine) University of California (UC) Center for Remote Sensing of Ice Sheets (CReSIS) University of Kansas Lawrence (KU) Section for GeoGenetics Institute for Geophysics University of Texas at Dallas Richardson (UT Dallas) 2018-11-14 https://hal.science/hal-02392102 https://hal.science/hal-02392102/document https://hal.science/hal-02392102/file/eaar8173.full.pdf https://doi.org/10.1126/sciadv.aar8173 en eng HAL CCSD American Association for the Advancement of Science (AAAS) info:eu-repo/semantics/altIdentifier/doi/10.1126/sciadv.aar8173 hal-02392102 https://hal.science/hal-02392102 https://hal.science/hal-02392102/document https://hal.science/hal-02392102/file/eaar8173.full.pdf doi:10.1126/sciadv.aar8173 http://creativecommons.org/licenses/by-nc/ info:eu-repo/semantics/OpenAccess ISSN: 2375-2548 Science Advances https://hal.science/hal-02392102 Science Advances , 2018, 4 (11), pp.eaar8173. ⟨10.1126/sciadv.aar8173⟩ [SDE]Environmental Sciences [SDE.MCG]Environmental Sciences/Global Changes info:eu-repo/semantics/article Journal articles 2018 ftunigrenoble https://doi.org/10.1126/sciadv.aar8173 2024-04-18T03:22:59Z International audience We report the discovery of a large impact crater beneath Hiawatha Glacier in northwest Greenland. From airborne radar surveys, we identify a 31-kilometer-wide, circular bedrock depression beneath up to a kilometer of ice. This depression has an elevated rim that cross-cuts tributary subglacial channels and a subdued central uplift that appears to be actively eroding. From ground investigations of the deglaciated foreland, we identify overprinted structures within Precambrian bedrock along the ice margin that strike tangent to the subglacial rim. Glaciofluvial sediment from the largest river draining the crater contains shocked quartz and other impactrelated grains. Geochemical analysis of this sediment indicates that the impactor was a fractionated iron asteroid, which must have been more than a kilometer wide to produce the identified crater. Radiostratigraphy of the ice in the crater shows that the Holocene ice is continuous and conformable, but all deeper and older ice appears to be debris rich or heavily disturbed. The age of this impact crater is presently unknown, but from our geological and geophysical evidence, we conclude that it is unlikely to predate the Pleistocene inception of the Greenland Ice Sheet. Article in Journal/Newspaper glacier Greenland Ice Sheet Université Grenoble Alpes: HAL Greenland Science Advances 4 11 eaar8173 |
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Open Polar |
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Université Grenoble Alpes: HAL |
op_collection_id |
ftunigrenoble |
language |
English |
topic |
[SDE]Environmental Sciences [SDE.MCG]Environmental Sciences/Global Changes |
spellingShingle |
[SDE]Environmental Sciences [SDE.MCG]Environmental Sciences/Global Changes Kjær, Kurt Larsen, Nicolaj Binder, Tobias Björk, Anders Eisen, Olaf Fahnestock, Mark Funder, Svend Garde, Adam Haack, Henning Helm, Veit Houmark-Nielsen, Michael Kjeldsen, Kristian Khan, Shfaqat Machguth, Horst Mcdonald, Iain Morlighem, Mathieu Mouginot, Jérémie Paden, John Waight, Tod Weikusat, Christian Willerslev, Eske Macgregor, Joseph, J A large impact crater beneath Hiawatha Glacier in northwest Greenland |
topic_facet |
[SDE]Environmental Sciences [SDE.MCG]Environmental Sciences/Global Changes |
description |
International audience We report the discovery of a large impact crater beneath Hiawatha Glacier in northwest Greenland. From airborne radar surveys, we identify a 31-kilometer-wide, circular bedrock depression beneath up to a kilometer of ice. This depression has an elevated rim that cross-cuts tributary subglacial channels and a subdued central uplift that appears to be actively eroding. From ground investigations of the deglaciated foreland, we identify overprinted structures within Precambrian bedrock along the ice margin that strike tangent to the subglacial rim. Glaciofluvial sediment from the largest river draining the crater contains shocked quartz and other impactrelated grains. Geochemical analysis of this sediment indicates that the impactor was a fractionated iron asteroid, which must have been more than a kilometer wide to produce the identified crater. Radiostratigraphy of the ice in the crater shows that the Holocene ice is continuous and conformable, but all deeper and older ice appears to be debris rich or heavily disturbed. The age of this impact crater is presently unknown, but from our geological and geophysical evidence, we conclude that it is unlikely to predate the Pleistocene inception of the Greenland Ice Sheet. |
author2 |
Abteilung Klinische Sozialmedizin, Berufs- und Umweltdermatologie Universität Heidelberg Heidelberg = Heidelberg University Centre for Star and Planet Formation (STARPLAN) Globe Institute Faculty of Health and Medical Sciences University of Copenhagen = Københavns Universitet (UCPH)-University of Copenhagen = Københavns Universitet (UCPH)-Faculty of Health and Medical Sciences University of Copenhagen = Københavns Universitet (UCPH)-University of Copenhagen = Københavns Universitet (UCPH) Jodrell Bank Centre for Astrophysics (JBCA) University of Manchester Manchester Institut des Géosciences de l’Environnement (IGE) Institut de Recherche pour le Développement (IRD)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes 2016-2019 (UGA 2016-2019 ) University of California Irvine (UC Irvine) University of California (UC) Center for Remote Sensing of Ice Sheets (CReSIS) University of Kansas Lawrence (KU) Section for GeoGenetics Institute for Geophysics University of Texas at Dallas Richardson (UT Dallas) |
format |
Article in Journal/Newspaper |
author |
Kjær, Kurt Larsen, Nicolaj Binder, Tobias Björk, Anders Eisen, Olaf Fahnestock, Mark Funder, Svend Garde, Adam Haack, Henning Helm, Veit Houmark-Nielsen, Michael Kjeldsen, Kristian Khan, Shfaqat Machguth, Horst Mcdonald, Iain Morlighem, Mathieu Mouginot, Jérémie Paden, John Waight, Tod Weikusat, Christian Willerslev, Eske Macgregor, Joseph, J |
author_facet |
Kjær, Kurt Larsen, Nicolaj Binder, Tobias Björk, Anders Eisen, Olaf Fahnestock, Mark Funder, Svend Garde, Adam Haack, Henning Helm, Veit Houmark-Nielsen, Michael Kjeldsen, Kristian Khan, Shfaqat Machguth, Horst Mcdonald, Iain Morlighem, Mathieu Mouginot, Jérémie Paden, John Waight, Tod Weikusat, Christian Willerslev, Eske Macgregor, Joseph, J |
author_sort |
Kjær, Kurt |
title |
A large impact crater beneath Hiawatha Glacier in northwest Greenland |
title_short |
A large impact crater beneath Hiawatha Glacier in northwest Greenland |
title_full |
A large impact crater beneath Hiawatha Glacier in northwest Greenland |
title_fullStr |
A large impact crater beneath Hiawatha Glacier in northwest Greenland |
title_full_unstemmed |
A large impact crater beneath Hiawatha Glacier in northwest Greenland |
title_sort |
large impact crater beneath hiawatha glacier in northwest greenland |
publisher |
HAL CCSD |
publishDate |
2018 |
url |
https://hal.science/hal-02392102 https://hal.science/hal-02392102/document https://hal.science/hal-02392102/file/eaar8173.full.pdf https://doi.org/10.1126/sciadv.aar8173 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
glacier Greenland Ice Sheet |
genre_facet |
glacier Greenland Ice Sheet |
op_source |
ISSN: 2375-2548 Science Advances https://hal.science/hal-02392102 Science Advances , 2018, 4 (11), pp.eaar8173. ⟨10.1126/sciadv.aar8173⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1126/sciadv.aar8173 hal-02392102 https://hal.science/hal-02392102 https://hal.science/hal-02392102/document https://hal.science/hal-02392102/file/eaar8173.full.pdf doi:10.1126/sciadv.aar8173 |
op_rights |
http://creativecommons.org/licenses/by-nc/ info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1126/sciadv.aar8173 |
container_title |
Science Advances |
container_volume |
4 |
container_issue |
11 |
container_start_page |
eaar8173 |
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