A Paleozoic age for the Tunnunik impact structure
We report paleomagnetic directions from the target rocks of the Tunnunik impact structure, as well as from lithic impact breccia dikes that formed during the impact event. The target sedimentary rocks have been remagnetized after impact-related tilting during a reverse polarity interval. Their magne...
Published in: | Meteoritics & Planetary Science |
---|---|
Main Authors: | , , , , , |
Format: | Article in Journal/Newspaper |
Language: | unknown |
Published: |
eScholarship, University of California
2019
|
Subjects: | |
Online Access: | https://escholarship.org/uc/item/2j35m2t7 https://escholarship.org/content/qt2j35m2t7/qt2j35m2t7.pdf https://doi.org/10.1111/maps.13239 |
id |
ftcdlib:oai:escholarship.org:ark:/13030/qt2j35m2t7 |
---|---|
record_format |
openpolar |
spelling |
ftcdlib:oai:escholarship.org:ark:/13030/qt2j35m2t7 2024-09-15T18:07:26+00:00 A Paleozoic age for the Tunnunik impact structure Lepaulard, Camille Gattacceca, Jérôme Swanson‐Hysell, Nicholas Quesnel, Yoann Demory, François Osinski, Gordon R 740 - 751 2019-04-01 application/pdf https://escholarship.org/uc/item/2j35m2t7 https://escholarship.org/content/qt2j35m2t7/qt2j35m2t7.pdf https://doi.org/10.1111/maps.13239 unknown eScholarship, University of California qt2j35m2t7 https://escholarship.org/uc/item/2j35m2t7 https://escholarship.org/content/qt2j35m2t7/qt2j35m2t7.pdf doi:10.1111/maps.13239 public Meteoritics and Planetary Science, vol 54, iss 4 Astronomical and Space Sciences Geochemistry Geology Geochemistry & Geophysics article 2019 ftcdlib https://doi.org/10.1111/maps.13239 2024-06-28T06:28:19Z We report paleomagnetic directions from the target rocks of the Tunnunik impact structure, as well as from lithic impact breccia dikes that formed during the impact event. The target sedimentary rocks have been remagnetized after impact-related tilting during a reverse polarity interval. Their magnetization is unblocked up to 350°C. The diabase dikes intruding into these sediments retained their original magnetization which unblocks above 400°C. The impact breccia records a paleomagnetic direction similar to that of the overprints in the target sedimentary rocks. The comparison of the resulting virtual geomagnetic pole for the Tunnunik impact structure with the apparent polar wander path for Laurentia combined with biostratigraphic constraints from the target sedimentary rocks is most consistent with an impact age in the Late Ordovician or Silurian, around 430–450Ma, soon after the deposition of the youngest impacted sedimentary rocks. Our results from the overprinted sedimentary rocks and diabase dikes imply that the postimpact temperature of the studied rocks was about 350°C. Article in Journal/Newspaper Geomagnetic Pole University of California: eScholarship Meteoritics & Planetary Science 54 4 740 751 |
institution |
Open Polar |
collection |
University of California: eScholarship |
op_collection_id |
ftcdlib |
language |
unknown |
topic |
Astronomical and Space Sciences Geochemistry Geology Geochemistry & Geophysics |
spellingShingle |
Astronomical and Space Sciences Geochemistry Geology Geochemistry & Geophysics Lepaulard, Camille Gattacceca, Jérôme Swanson‐Hysell, Nicholas Quesnel, Yoann Demory, François Osinski, Gordon R A Paleozoic age for the Tunnunik impact structure |
topic_facet |
Astronomical and Space Sciences Geochemistry Geology Geochemistry & Geophysics |
description |
We report paleomagnetic directions from the target rocks of the Tunnunik impact structure, as well as from lithic impact breccia dikes that formed during the impact event. The target sedimentary rocks have been remagnetized after impact-related tilting during a reverse polarity interval. Their magnetization is unblocked up to 350°C. The diabase dikes intruding into these sediments retained their original magnetization which unblocks above 400°C. The impact breccia records a paleomagnetic direction similar to that of the overprints in the target sedimentary rocks. The comparison of the resulting virtual geomagnetic pole for the Tunnunik impact structure with the apparent polar wander path for Laurentia combined with biostratigraphic constraints from the target sedimentary rocks is most consistent with an impact age in the Late Ordovician or Silurian, around 430–450Ma, soon after the deposition of the youngest impacted sedimentary rocks. Our results from the overprinted sedimentary rocks and diabase dikes imply that the postimpact temperature of the studied rocks was about 350°C. |
format |
Article in Journal/Newspaper |
author |
Lepaulard, Camille Gattacceca, Jérôme Swanson‐Hysell, Nicholas Quesnel, Yoann Demory, François Osinski, Gordon R |
author_facet |
Lepaulard, Camille Gattacceca, Jérôme Swanson‐Hysell, Nicholas Quesnel, Yoann Demory, François Osinski, Gordon R |
author_sort |
Lepaulard, Camille |
title |
A Paleozoic age for the Tunnunik impact structure |
title_short |
A Paleozoic age for the Tunnunik impact structure |
title_full |
A Paleozoic age for the Tunnunik impact structure |
title_fullStr |
A Paleozoic age for the Tunnunik impact structure |
title_full_unstemmed |
A Paleozoic age for the Tunnunik impact structure |
title_sort |
paleozoic age for the tunnunik impact structure |
publisher |
eScholarship, University of California |
publishDate |
2019 |
url |
https://escholarship.org/uc/item/2j35m2t7 https://escholarship.org/content/qt2j35m2t7/qt2j35m2t7.pdf https://doi.org/10.1111/maps.13239 |
op_coverage |
740 - 751 |
genre |
Geomagnetic Pole |
genre_facet |
Geomagnetic Pole |
op_source |
Meteoritics and Planetary Science, vol 54, iss 4 |
op_relation |
qt2j35m2t7 https://escholarship.org/uc/item/2j35m2t7 https://escholarship.org/content/qt2j35m2t7/qt2j35m2t7.pdf doi:10.1111/maps.13239 |
op_rights |
public |
op_doi |
https://doi.org/10.1111/maps.13239 |
container_title |
Meteoritics & Planetary Science |
container_volume |
54 |
container_issue |
4 |
container_start_page |
740 |
op_container_end_page |
751 |
_version_ |
1810444823075749888 |