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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ftunivquebecar:oai:semaphore.uqar.ca:1462 2023-11-05T03:39:22+01:00 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 2018-04 application/pdf https://semaphore.uqar.ca/id/eprint/1462/ https://semaphore.uqar.ca/id/eprint/1462/1/Charles-Edouard_Deschamps_et_al_avril2018.pdf https://doi.org/10.1111/bor.12296 fr fre https://semaphore.uqar.ca/id/eprint/1462/1/Charles-Edouard_Deschamps_et_al_avril2018.pdf Deschamps, Charles-Edouard, St-Onge, Guillaume orcid:0000-0001-6958-4217 , Montero-Serrano, Jean-Carlos orcid:0000-0001-7896-6284 et Polyak, Leonid (2018). Chronostratigraphy and spatial distribution of magnetic sediments in the Chukchi and Beaufort seas since the last deglaciation. Boreas, 47 (2). pp. 544-564. Mer Beaufort Tchouktches Deglaciation Sediment Distribution Sedimentation Taux Chronostratigraphie Paleomagnetisme Article Évalué par les pairs 2018 ftunivquebecar https://doi.org/10.1111/bor.12296 2023-10-07T23:10:37Z 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 210Pb‐based sedimentation rate estimate. The analysed cores 01JPC, 03PC and 02PC 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 01JPC (60 cm ka−1) and 03PC (40–70 cm ka−1). Core 02PC 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 Tchouktche* Université du Québec à Rimouski (UQAR): Sémaphore Boreas 47 2 544 564 |
institution |
Open Polar |
collection |
Université du Québec à Rimouski (UQAR): Sémaphore |
op_collection_id |
ftunivquebecar |
language |
French |
topic |
Mer Beaufort Tchouktches Deglaciation Sediment Distribution Sedimentation Taux Chronostratigraphie Paleomagnetisme |
spellingShingle |
Mer Beaufort Tchouktches Deglaciation Sediment Distribution Sedimentation Taux Chronostratigraphie Paleomagnetisme 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 |
topic_facet |
Mer Beaufort Tchouktches Deglaciation Sediment Distribution Sedimentation Taux Chronostratigraphie Paleomagnetisme |
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 210Pb‐based sedimentation rate estimate. The analysed cores 01JPC, 03PC and 02PC 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 01JPC (60 cm ka−1) and 03PC (40–70 cm ka−1). Core 02PC 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. |
format |
Article in Journal/Newspaper |
author |
Deschamps, Charles-Edouard St-Onge, Guillaume Montero-Serrano, Jean-Carlos Polyak, Leonid |
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 |
publishDate |
2018 |
url |
https://semaphore.uqar.ca/id/eprint/1462/ https://semaphore.uqar.ca/id/eprint/1462/1/Charles-Edouard_Deschamps_et_al_avril2018.pdf https://doi.org/10.1111/bor.12296 |
genre |
Arctic Arctic Ocean Beaufort Sea Chukchi Tchouktche* |
genre_facet |
Arctic Arctic Ocean Beaufort Sea Chukchi Tchouktche* |
op_relation |
https://semaphore.uqar.ca/id/eprint/1462/1/Charles-Edouard_Deschamps_et_al_avril2018.pdf Deschamps, Charles-Edouard, St-Onge, Guillaume orcid:0000-0001-6958-4217 , Montero-Serrano, Jean-Carlos orcid:0000-0001-7896-6284 et Polyak, Leonid (2018). Chronostratigraphy and spatial distribution of magnetic sediments in the Chukchi and Beaufort seas since the last deglaciation. Boreas, 47 (2). pp. 544-564. |
op_doi |
https://doi.org/10.1111/bor.12296 |
container_title |
Boreas |
container_volume |
47 |
container_issue |
2 |
container_start_page |
544 |
op_container_end_page |
564 |
_version_ |
1781695193233227776 |