An updated Weichselian chronostratigraphic framework of the Kongsfjorden Trough Mouth Fan and its implications for the glacial history of Svalbard
The Arctic is a climate-sensitive area, responding rapidly to present changes, but for the past changes, the record is still incomplete. For instance, the Weichselian glacial history of the Svalbard–Barents Sea Ice Sheet (SBIS) has largely been reconstructed based on studies of the fragmentary Spits...
Published in: | Boreas |
---|---|
Main Authors: | , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Wiley
2022
|
Subjects: | |
Online Access: | https://hdl.handle.net/11250/2982730 https://doi.org/10.1111/bor.12581 |
id |
ftunivbergen:oai:bora.uib.no:11250/2982730 |
---|---|
record_format |
openpolar |
spelling |
ftunivbergen:oai:bora.uib.no:11250/2982730 2023-05-15T15:17:50+02:00 An updated Weichselian chronostratigraphic framework of the Kongsfjorden Trough Mouth Fan and its implications for the glacial history of Svalbard Wiberg, Daniel Hesjedal Haflidason, Haflidi Laberg, Jan Sverre 2022 application/pdf https://hdl.handle.net/11250/2982730 https://doi.org/10.1111/bor.12581 eng eng Wiley urn:issn:0300-9483 https://hdl.handle.net/11250/2982730 https://doi.org/10.1111/bor.12581 cristin:1998346 Boreas, 2022. Navngivelse 4.0 Internasjonal http://creativecommons.org/licenses/by/4.0/deed.no Copyright 2022 The Authors Boreas Journal article Peer reviewed 2022 ftunivbergen https://doi.org/10.1111/bor.12581 2023-03-14T17:39:17Z The Arctic is a climate-sensitive area, responding rapidly to present changes, but for the past changes, the record is still incomplete. For instance, the Weichselian glacial history of the Svalbard–Barents Sea Ice Sheet (SBIS) has largely been reconstructed based on studies of the fragmentary Spitsbergen terrestrial and shelf records. However, the sediments removed from the land and shelf areas during peak glacials were deposited on trough mouth fans located along the continental slope. By studying the stratigraphy and processes of the trough mouth fans, comprising a more complete sediment archive, our new data have allowed gaps in the Weichselian glacial history of the SBIS to be refined and filled. Here we present new lithological and geochronological data from the Kongsfjorden Trough Mouth Fan, closely linked to the advance and decay of the SBIS. High-resolution TOPAS seismic profiles reveal three distinct packages of glacigenic debris flows (GDFs) within its upper stratigraphy, each interpreted to represent an advance of the SBIS to the shelf edge. A radiocarbon dated, 12.6-m-long core from the southern flank of the Kongsfjorden Trough Mouth Fan penetrates trough sediments directly linked to the youngest GDF package and terminates in the second GDF, allowing us to study the last two Kongsfjorden ice-stream advances in greater detail than was previously possible. The age model of core GS10-164-09PC, based on combining 14C-, 18O-stable isotope and magnetic susceptibility data, spans the last ~54 ka. An Early Weichselian glacial advance is tentatively dated to have ended at ~90 ka. A second peak glaciation is estimated at ~70 ka, followed by a deglaciation from ~54 ka. An ice rafted debris-rich unit (U7) dated between 38 and 34 ka, followed by a plumite (U6), indicates an advance of unknown extent. The Last Glacial Maximum advance is dated to before 24 ka BP, followed by a rapid deglaciation at ~15 ka. The presence of coarser-grained sorted sediments at the present seafloor is attributed to the influence of ... Article in Journal/Newspaper Arctic Barents Sea Ice Sheet Kongsfjord* Kongsfjorden Magnetic susceptibility Sea ice Svalbard Svalbard-Barents Sea Ice sheet Spitsbergen University of Bergen: Bergen Open Research Archive (BORA-UiB) Arctic Svalbard Barents Sea Boreas 51 3 667 683 |
institution |
Open Polar |
collection |
University of Bergen: Bergen Open Research Archive (BORA-UiB) |
op_collection_id |
ftunivbergen |
language |
English |
description |
The Arctic is a climate-sensitive area, responding rapidly to present changes, but for the past changes, the record is still incomplete. For instance, the Weichselian glacial history of the Svalbard–Barents Sea Ice Sheet (SBIS) has largely been reconstructed based on studies of the fragmentary Spitsbergen terrestrial and shelf records. However, the sediments removed from the land and shelf areas during peak glacials were deposited on trough mouth fans located along the continental slope. By studying the stratigraphy and processes of the trough mouth fans, comprising a more complete sediment archive, our new data have allowed gaps in the Weichselian glacial history of the SBIS to be refined and filled. Here we present new lithological and geochronological data from the Kongsfjorden Trough Mouth Fan, closely linked to the advance and decay of the SBIS. High-resolution TOPAS seismic profiles reveal three distinct packages of glacigenic debris flows (GDFs) within its upper stratigraphy, each interpreted to represent an advance of the SBIS to the shelf edge. A radiocarbon dated, 12.6-m-long core from the southern flank of the Kongsfjorden Trough Mouth Fan penetrates trough sediments directly linked to the youngest GDF package and terminates in the second GDF, allowing us to study the last two Kongsfjorden ice-stream advances in greater detail than was previously possible. The age model of core GS10-164-09PC, based on combining 14C-, 18O-stable isotope and magnetic susceptibility data, spans the last ~54 ka. An Early Weichselian glacial advance is tentatively dated to have ended at ~90 ka. A second peak glaciation is estimated at ~70 ka, followed by a deglaciation from ~54 ka. An ice rafted debris-rich unit (U7) dated between 38 and 34 ka, followed by a plumite (U6), indicates an advance of unknown extent. The Last Glacial Maximum advance is dated to before 24 ka BP, followed by a rapid deglaciation at ~15 ka. The presence of coarser-grained sorted sediments at the present seafloor is attributed to the influence of ... |
format |
Article in Journal/Newspaper |
author |
Wiberg, Daniel Hesjedal Haflidason, Haflidi Laberg, Jan Sverre |
spellingShingle |
Wiberg, Daniel Hesjedal Haflidason, Haflidi Laberg, Jan Sverre An updated Weichselian chronostratigraphic framework of the Kongsfjorden Trough Mouth Fan and its implications for the glacial history of Svalbard |
author_facet |
Wiberg, Daniel Hesjedal Haflidason, Haflidi Laberg, Jan Sverre |
author_sort |
Wiberg, Daniel Hesjedal |
title |
An updated Weichselian chronostratigraphic framework of the Kongsfjorden Trough Mouth Fan and its implications for the glacial history of Svalbard |
title_short |
An updated Weichselian chronostratigraphic framework of the Kongsfjorden Trough Mouth Fan and its implications for the glacial history of Svalbard |
title_full |
An updated Weichselian chronostratigraphic framework of the Kongsfjorden Trough Mouth Fan and its implications for the glacial history of Svalbard |
title_fullStr |
An updated Weichselian chronostratigraphic framework of the Kongsfjorden Trough Mouth Fan and its implications for the glacial history of Svalbard |
title_full_unstemmed |
An updated Weichselian chronostratigraphic framework of the Kongsfjorden Trough Mouth Fan and its implications for the glacial history of Svalbard |
title_sort |
updated weichselian chronostratigraphic framework of the kongsfjorden trough mouth fan and its implications for the glacial history of svalbard |
publisher |
Wiley |
publishDate |
2022 |
url |
https://hdl.handle.net/11250/2982730 https://doi.org/10.1111/bor.12581 |
geographic |
Arctic Svalbard Barents Sea |
geographic_facet |
Arctic Svalbard Barents Sea |
genre |
Arctic Barents Sea Ice Sheet Kongsfjord* Kongsfjorden Magnetic susceptibility Sea ice Svalbard Svalbard-Barents Sea Ice sheet Spitsbergen |
genre_facet |
Arctic Barents Sea Ice Sheet Kongsfjord* Kongsfjorden Magnetic susceptibility Sea ice Svalbard Svalbard-Barents Sea Ice sheet Spitsbergen |
op_source |
Boreas |
op_relation |
urn:issn:0300-9483 https://hdl.handle.net/11250/2982730 https://doi.org/10.1111/bor.12581 cristin:1998346 Boreas, 2022. |
op_rights |
Navngivelse 4.0 Internasjonal http://creativecommons.org/licenses/by/4.0/deed.no Copyright 2022 The Authors |
op_doi |
https://doi.org/10.1111/bor.12581 |
container_title |
Boreas |
container_volume |
51 |
container_issue |
3 |
container_start_page |
667 |
op_container_end_page |
683 |
_version_ |
1766348097271627776 |