Chronostratigraphy and spatial distribution of magnetic sediments in the Chukchi and Beaufort seas since the last deglaciation
Palaeomagnetic investigation of three sediment cores from the Chukchi and Beaufort Sea margins was performed to better constrain the regional chronostratigraphy and to gain insights into sediment magnetic properties at the North American Arctic margin during the Holocene and the preceding deglaciati...
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crwiley:10.1111/bor.12296 2024-06-09T07:43:53+00:00 Chronostratigraphy and spatial distribution of magnetic sediments in the Chukchi and Beaufort seas since the last deglaciation Deschamps, Charles‐Edouard St‐Onge, Guillaume Montero‐Serrano, Jean‐Carlos Polyak, Leonid Natural Sciences and Engineering Research Council of Canada National Science Foundation 2017 http://dx.doi.org/10.1111/bor.12296 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fbor.12296 https://onlinelibrary.wiley.com/doi/pdf/10.1111/bor.12296 https://onlinelibrary.wiley.com/doi/full-xml/10.1111/bor.12296 https://onlinelibrary.wiley.com/doi/am-pdf/10.1111/bor.12296 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#am http://onlinelibrary.wiley.com/termsAndConditions#vor Boreas volume 47, issue 2, page 544-564 ISSN 0300-9483 1502-3885 journal-article 2017 crwiley https://doi.org/10.1111/bor.12296 2024-05-16T14:26:34Z Palaeomagnetic investigation of three sediment cores from the Chukchi and Beaufort Sea margins was performed to better constrain the regional chronostratigraphy and to gain insights into sediment magnetic properties at the North American Arctic margin during the Holocene and the preceding deglaciation. Palaeomagnetic analyses reveal that the sediments under study are characterized by low‐coercivity ferrimagnetic minerals (magnetite), mostly in the pseudo‐single domain grain‐size range, and by a strong, stable, well‐defined remanent magnetization ( MAD <5°). Age models for these sediment cores were constrained by comparing their palaeomagnetic secular variations (inclination, declination and relative palaeointensity) with previously published and independently dated sedimentary marine records from the study area. The magnetostratigraphical age models were verified by AMS radiocarbon dating tie points, tephrochronology and 210 Pb‐based sedimentation rate estimate. The analysed cores 01 JPC , 03 PC and 02 PC span c. 6000, 10 500 and 13 500 cal. a BP , respectively. The estimated sedimentation rates were stable and relatively high since the deglaciation in cores 01 JPC (60 cm ka −1 ) and 03 PC (40–70 cm ka −1 ). Core 02 PC shows much lower Holocene sedimentation rates with a strong decrease after the deglaciation from ~60 to 10–20 cm ka −1 . Overall, this study illustrates the usefulness of palaeomagnetism to improve the dating of late Quaternary sedimentary records in the Arctic Ocean. Article in Journal/Newspaper Arctic Arctic Ocean Beaufort Sea Chukchi Wiley Online Library Arctic Arctic Ocean Boreas 47 2 544 564 |
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Open Polar |
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Wiley Online Library |
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crwiley |
language |
English |
description |
Palaeomagnetic investigation of three sediment cores from the Chukchi and Beaufort Sea margins was performed to better constrain the regional chronostratigraphy and to gain insights into sediment magnetic properties at the North American Arctic margin during the Holocene and the preceding deglaciation. Palaeomagnetic analyses reveal that the sediments under study are characterized by low‐coercivity ferrimagnetic minerals (magnetite), mostly in the pseudo‐single domain grain‐size range, and by a strong, stable, well‐defined remanent magnetization ( MAD <5°). Age models for these sediment cores were constrained by comparing their palaeomagnetic secular variations (inclination, declination and relative palaeointensity) with previously published and independently dated sedimentary marine records from the study area. The magnetostratigraphical age models were verified by AMS radiocarbon dating tie points, tephrochronology and 210 Pb‐based sedimentation rate estimate. The analysed cores 01 JPC , 03 PC and 02 PC span c. 6000, 10 500 and 13 500 cal. a BP , respectively. The estimated sedimentation rates were stable and relatively high since the deglaciation in cores 01 JPC (60 cm ka −1 ) and 03 PC (40–70 cm ka −1 ). Core 02 PC shows much lower Holocene sedimentation rates with a strong decrease after the deglaciation from ~60 to 10–20 cm ka −1 . Overall, this study illustrates the usefulness of palaeomagnetism to improve the dating of late Quaternary sedimentary records in the Arctic Ocean. |
author2 |
Natural Sciences and Engineering Research Council of Canada National Science Foundation |
format |
Article in Journal/Newspaper |
author |
Deschamps, Charles‐Edouard St‐Onge, Guillaume Montero‐Serrano, Jean‐Carlos Polyak, Leonid |
spellingShingle |
Deschamps, Charles‐Edouard St‐Onge, Guillaume Montero‐Serrano, Jean‐Carlos Polyak, Leonid Chronostratigraphy and spatial distribution of magnetic sediments in the Chukchi and Beaufort seas since the last deglaciation |
author_facet |
Deschamps, Charles‐Edouard St‐Onge, Guillaume Montero‐Serrano, Jean‐Carlos Polyak, Leonid |
author_sort |
Deschamps, Charles‐Edouard |
title |
Chronostratigraphy and spatial distribution of magnetic sediments in the Chukchi and Beaufort seas since the last deglaciation |
title_short |
Chronostratigraphy and spatial distribution of magnetic sediments in the Chukchi and Beaufort seas since the last deglaciation |
title_full |
Chronostratigraphy and spatial distribution of magnetic sediments in the Chukchi and Beaufort seas since the last deglaciation |
title_fullStr |
Chronostratigraphy and spatial distribution of magnetic sediments in the Chukchi and Beaufort seas since the last deglaciation |
title_full_unstemmed |
Chronostratigraphy and spatial distribution of magnetic sediments in the Chukchi and Beaufort seas since the last deglaciation |
title_sort |
chronostratigraphy and spatial distribution of magnetic sediments in the chukchi and beaufort seas since the last deglaciation |
publisher |
Wiley |
publishDate |
2017 |
url |
http://dx.doi.org/10.1111/bor.12296 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fbor.12296 https://onlinelibrary.wiley.com/doi/pdf/10.1111/bor.12296 https://onlinelibrary.wiley.com/doi/full-xml/10.1111/bor.12296 https://onlinelibrary.wiley.com/doi/am-pdf/10.1111/bor.12296 |
geographic |
Arctic Arctic Ocean |
geographic_facet |
Arctic Arctic Ocean |
genre |
Arctic Arctic Ocean Beaufort Sea Chukchi |
genre_facet |
Arctic Arctic Ocean Beaufort Sea Chukchi |
op_source |
Boreas volume 47, issue 2, page 544-564 ISSN 0300-9483 1502-3885 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#am http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/bor.12296 |
container_title |
Boreas |
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47 |
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2 |
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544 |
op_container_end_page |
564 |
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1801372715094900736 |