Stirred not shaken; critical evaluation of a proposed Archean meteorite impact in West Greenland
Large meteorite impacts have a profound effect on the Earth's geosphere, atmosphere, hydrosphere and biosphere. It is widely accepted that the early Earth was subject to intense bombardment from 4.5 to 3.8 Ga, yet evidence for subsequent bolide impacts during the Archean Eon (4.0 to 2.5 Ga) is...
Published in: | Earth and Planetary Science Letters |
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Language: | English |
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2021
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Online Access: | https://curis.ku.dk/portal/da/publications/stirred-not-shaken-critical-evaluation-of-a-proposed-archean-meteorite-impact-in-west-greenland(e3fdbe1e-b979-4b19-946f-03052382d80a).html https://doi.org/10.1016/j.epsl.2020.116730 https://curis.ku.dk/ws/files/260597028/Stirred_not_shaken_critical_evaluation_of_a_proposed_Archean_meteorite_impact_in_West_Greenland.pdf |
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ftcopenhagenunip:oai:pure.atira.dk:publications/e3fdbe1e-b979-4b19-946f-03052382d80a 2024-05-19T07:41:16+00:00 Stirred not shaken; critical evaluation of a proposed Archean meteorite impact in West Greenland Yakymchuk, Chris Kirkland, Christopher L. Cavosie, Aaron J. Szilas, Kristoffer Hollis, Julie Gardiner, Nicholas J. Waterton, Pedro Steenfelt, Agnete Martin, Laure 2021-03 application/pdf https://curis.ku.dk/portal/da/publications/stirred-not-shaken-critical-evaluation-of-a-proposed-archean-meteorite-impact-in-west-greenland(e3fdbe1e-b979-4b19-946f-03052382d80a).html https://doi.org/10.1016/j.epsl.2020.116730 https://curis.ku.dk/ws/files/260597028/Stirred_not_shaken_critical_evaluation_of_a_proposed_Archean_meteorite_impact_in_West_Greenland.pdf eng eng info:eu-repo/semantics/openAccess Yakymchuk , C , Kirkland , C L , Cavosie , A J , Szilas , K , Hollis , J , Gardiner , N J , Waterton , P , Steenfelt , A & Martin , L 2021 , ' Stirred not shaken; critical evaluation of a proposed Archean meteorite impact in West Greenland ' , Earth and Planetary Science Letters , vol. 557 , 116730 . https://doi.org/10.1016/j.epsl.2020.116730 bolide impact Maniitsoq North Atlantic Craton planar deformation features zircon article 2021 ftcopenhagenunip https://doi.org/10.1016/j.epsl.2020.116730 2024-05-02T00:33:11Z Large meteorite impacts have a profound effect on the Earth's geosphere, atmosphere, hydrosphere and biosphere. It is widely accepted that the early Earth was subject to intense bombardment from 4.5 to 3.8 Ga, yet evidence for subsequent bolide impacts during the Archean Eon (4.0 to 2.5 Ga) is sparse. However, understanding the timing and magnitude of these early events is important, as they may have triggered significant change points to global geochemical cycles. The Maniitsoq region of southern West Greenland has been proposed to record a ∼3.0 Ga meteorite impact, which, if confirmed, would be the oldest and only known impact structure to have survived from the Archean. Such an ancient structure would provide the first insight into the style, setting, and possible environmental effects of impact bombardment continuing into the late Archean. Here, using field mapping, geochronology, isotope geochemistry, and electron backscatter diffraction mapping of 5,587 zircon grains from the Maniitsoq region (rock and fluvial sediment samples), we test the hypothesis that the Maniitsoq structure represents Earth's earliest known impact structure. Our comprehensive survey shows that previously proposed impact-related geological features, ranging from microscopic structures at the mineral scale to macroscopic structures at the terrane scale, as well as the age and geochemistry of the rocks in the Maniitsoq region, can be explained through endogenic (non-impact) processes. Despite the higher impact flux, intact craters from the Archean Eon remain elusive on Earth. Article in Journal/Newspaper Greenland Maniitsoq North Atlantic University of Copenhagen: Research Earth and Planetary Science Letters 557 116730 |
institution |
Open Polar |
collection |
University of Copenhagen: Research |
op_collection_id |
ftcopenhagenunip |
language |
English |
topic |
bolide impact Maniitsoq North Atlantic Craton planar deformation features zircon |
spellingShingle |
bolide impact Maniitsoq North Atlantic Craton planar deformation features zircon Yakymchuk, Chris Kirkland, Christopher L. Cavosie, Aaron J. Szilas, Kristoffer Hollis, Julie Gardiner, Nicholas J. Waterton, Pedro Steenfelt, Agnete Martin, Laure Stirred not shaken; critical evaluation of a proposed Archean meteorite impact in West Greenland |
topic_facet |
bolide impact Maniitsoq North Atlantic Craton planar deformation features zircon |
description |
Large meteorite impacts have a profound effect on the Earth's geosphere, atmosphere, hydrosphere and biosphere. It is widely accepted that the early Earth was subject to intense bombardment from 4.5 to 3.8 Ga, yet evidence for subsequent bolide impacts during the Archean Eon (4.0 to 2.5 Ga) is sparse. However, understanding the timing and magnitude of these early events is important, as they may have triggered significant change points to global geochemical cycles. The Maniitsoq region of southern West Greenland has been proposed to record a ∼3.0 Ga meteorite impact, which, if confirmed, would be the oldest and only known impact structure to have survived from the Archean. Such an ancient structure would provide the first insight into the style, setting, and possible environmental effects of impact bombardment continuing into the late Archean. Here, using field mapping, geochronology, isotope geochemistry, and electron backscatter diffraction mapping of 5,587 zircon grains from the Maniitsoq region (rock and fluvial sediment samples), we test the hypothesis that the Maniitsoq structure represents Earth's earliest known impact structure. Our comprehensive survey shows that previously proposed impact-related geological features, ranging from microscopic structures at the mineral scale to macroscopic structures at the terrane scale, as well as the age and geochemistry of the rocks in the Maniitsoq region, can be explained through endogenic (non-impact) processes. Despite the higher impact flux, intact craters from the Archean Eon remain elusive on Earth. |
format |
Article in Journal/Newspaper |
author |
Yakymchuk, Chris Kirkland, Christopher L. Cavosie, Aaron J. Szilas, Kristoffer Hollis, Julie Gardiner, Nicholas J. Waterton, Pedro Steenfelt, Agnete Martin, Laure |
author_facet |
Yakymchuk, Chris Kirkland, Christopher L. Cavosie, Aaron J. Szilas, Kristoffer Hollis, Julie Gardiner, Nicholas J. Waterton, Pedro Steenfelt, Agnete Martin, Laure |
author_sort |
Yakymchuk, Chris |
title |
Stirred not shaken; critical evaluation of a proposed Archean meteorite impact in West Greenland |
title_short |
Stirred not shaken; critical evaluation of a proposed Archean meteorite impact in West Greenland |
title_full |
Stirred not shaken; critical evaluation of a proposed Archean meteorite impact in West Greenland |
title_fullStr |
Stirred not shaken; critical evaluation of a proposed Archean meteorite impact in West Greenland |
title_full_unstemmed |
Stirred not shaken; critical evaluation of a proposed Archean meteorite impact in West Greenland |
title_sort |
stirred not shaken; critical evaluation of a proposed archean meteorite impact in west greenland |
publishDate |
2021 |
url |
https://curis.ku.dk/portal/da/publications/stirred-not-shaken-critical-evaluation-of-a-proposed-archean-meteorite-impact-in-west-greenland(e3fdbe1e-b979-4b19-946f-03052382d80a).html https://doi.org/10.1016/j.epsl.2020.116730 https://curis.ku.dk/ws/files/260597028/Stirred_not_shaken_critical_evaluation_of_a_proposed_Archean_meteorite_impact_in_West_Greenland.pdf |
genre |
Greenland Maniitsoq North Atlantic |
genre_facet |
Greenland Maniitsoq North Atlantic |
op_source |
Yakymchuk , C , Kirkland , C L , Cavosie , A J , Szilas , K , Hollis , J , Gardiner , N J , Waterton , P , Steenfelt , A & Martin , L 2021 , ' Stirred not shaken; critical evaluation of a proposed Archean meteorite impact in West Greenland ' , Earth and Planetary Science Letters , vol. 557 , 116730 . https://doi.org/10.1016/j.epsl.2020.116730 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1016/j.epsl.2020.116730 |
container_title |
Earth and Planetary Science Letters |
container_volume |
557 |
container_start_page |
116730 |
_version_ |
1799480864160088064 |