Tephra horizons identified in the western North Atlantic and Nordic Seas during the Last Glacial Period: Extending the marine tephra framework

Geochemically distinct volcanic ash (tephra) deposits are increasingly acknowledged as a key geochronological tool to synchronize independent paleoclimate archives. Recent advances in the detection of invisible (crypto) tephra have led to the ongoing establishment, development and integration of reg...

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Published in:Quaternary Science Reviews
Main Authors: Rutledal, Sunniva, Berben, Sarah Miche Patricia, Dokken, Trond Martin, Bilt, Willem van der, Cederstrøm, Jan Magne, Jansen, Eystein
Format: Article in Journal/Newspaper
Language:English
Published: Elsevier 2020
Subjects:
Online Access:https://hdl.handle.net/11250/2736462
https://doi.org/10.1016/j.quascirev.2020.106247
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spelling ftunivbergen:oai:bora.uib.no:11250/2736462 2023-05-15T16:52:45+02:00 Tephra horizons identified in the western North Atlantic and Nordic Seas during the Last Glacial Period: Extending the marine tephra framework Rutledal, Sunniva Berben, Sarah Miche Patricia Dokken, Trond Martin Bilt, Willem van der Cederstrøm, Jan Magne Jansen, Eystein 2020 application/pdf https://hdl.handle.net/11250/2736462 https://doi.org/10.1016/j.quascirev.2020.106247 eng eng Elsevier EC/FP7/610055 urn:issn:0277-3791 https://hdl.handle.net/11250/2736462 https://doi.org/10.1016/j.quascirev.2020.106247 cristin:1800954 Quaternary Science Reviews. 2020, 240, 106247 Navngivelse 4.0 Internasjonal http://creativecommons.org/licenses/by/4.0/deed.no Copyright 2020 The Authors 106247 Quaternary Science Reviews 240 Journal article Peer reviewed 2020 ftunivbergen https://doi.org/10.1016/j.quascirev.2020.106247 2023-03-14T17:39:15Z Geochemically distinct volcanic ash (tephra) deposits are increasingly acknowledged as a key geochronological tool to synchronize independent paleoclimate archives. Recent advances in the detection of invisible (crypto) tephra have led to the ongoing establishment, development and integration of regional tephra lattices. These frameworks offer an overview of the spatial extent of geochemically characterized tephra from dated eruptions – a valuable tool for precise correlation of paleorecords within these areas. Here, we harness cryptotephra analysis to investigate the occurrence of two well-known tephra markers from the Last Glacial Period (i.e. FMAZ II-1 (26.7 ka b2k) and NAAZ II (II-RHY-1) (55.3 ka b2k)), in marine sediment cores from the Nordic, Irminger and Labrador Seas. In addition, we assess the imprint of bioturbation on two of these tephra deposits using Computed Tomography (CT) imagery. We have successfully identified FMAZ II-1 in the Nordic and Irminger Seas. The tephra deposit is a visible deposit in the Nordic Seas, whereas it appears as a single high concentration peak within the fine-grained shard size fraction (i.e. 25-80 μm) in the Irminger Sea. Both horizons are primary airfall deposits, and this study is the first to identify a FMAZ II-1 deposit of isochronous nature in the Irminger Sea region. In addition, we have identified a new tephra horizon in the Irminger Sea, which is stratigraphically associated with FMAZ II-1, and geochemically similar to the known 2-JPC-192-1 population. We discuss its potential to serve as a new reference tie-point for correlations in the region. Lastly, we have successfully identified NAAZ II (II-RHY-1) of isochronous nature in both the Irminger and Labrador Sea. The layers are interpreted to be deposited by either direct airfall or by sea-ice drifting past the sites. Compared to the existing frameworks, which previously mainly focused on sites east of Iceland, our findings expand the knowledge and utility of the FMAZ II-1 and NAAZ II (II-RHY-1) horizons. ... Article in Journal/Newspaper Iceland Labrador Sea Nordic Seas North Atlantic Sea ice University of Bergen: Bergen Open Research Archive (BORA-UiB) Irminger Sea ENVELOPE(-34.041,-34.041,63.054,63.054) Quaternary Science Reviews 240 106247
institution Open Polar
collection University of Bergen: Bergen Open Research Archive (BORA-UiB)
op_collection_id ftunivbergen
language English
description Geochemically distinct volcanic ash (tephra) deposits are increasingly acknowledged as a key geochronological tool to synchronize independent paleoclimate archives. Recent advances in the detection of invisible (crypto) tephra have led to the ongoing establishment, development and integration of regional tephra lattices. These frameworks offer an overview of the spatial extent of geochemically characterized tephra from dated eruptions – a valuable tool for precise correlation of paleorecords within these areas. Here, we harness cryptotephra analysis to investigate the occurrence of two well-known tephra markers from the Last Glacial Period (i.e. FMAZ II-1 (26.7 ka b2k) and NAAZ II (II-RHY-1) (55.3 ka b2k)), in marine sediment cores from the Nordic, Irminger and Labrador Seas. In addition, we assess the imprint of bioturbation on two of these tephra deposits using Computed Tomography (CT) imagery. We have successfully identified FMAZ II-1 in the Nordic and Irminger Seas. The tephra deposit is a visible deposit in the Nordic Seas, whereas it appears as a single high concentration peak within the fine-grained shard size fraction (i.e. 25-80 μm) in the Irminger Sea. Both horizons are primary airfall deposits, and this study is the first to identify a FMAZ II-1 deposit of isochronous nature in the Irminger Sea region. In addition, we have identified a new tephra horizon in the Irminger Sea, which is stratigraphically associated with FMAZ II-1, and geochemically similar to the known 2-JPC-192-1 population. We discuss its potential to serve as a new reference tie-point for correlations in the region. Lastly, we have successfully identified NAAZ II (II-RHY-1) of isochronous nature in both the Irminger and Labrador Sea. The layers are interpreted to be deposited by either direct airfall or by sea-ice drifting past the sites. Compared to the existing frameworks, which previously mainly focused on sites east of Iceland, our findings expand the knowledge and utility of the FMAZ II-1 and NAAZ II (II-RHY-1) horizons. ...
format Article in Journal/Newspaper
author Rutledal, Sunniva
Berben, Sarah Miche Patricia
Dokken, Trond Martin
Bilt, Willem van der
Cederstrøm, Jan Magne
Jansen, Eystein
spellingShingle Rutledal, Sunniva
Berben, Sarah Miche Patricia
Dokken, Trond Martin
Bilt, Willem van der
Cederstrøm, Jan Magne
Jansen, Eystein
Tephra horizons identified in the western North Atlantic and Nordic Seas during the Last Glacial Period: Extending the marine tephra framework
author_facet Rutledal, Sunniva
Berben, Sarah Miche Patricia
Dokken, Trond Martin
Bilt, Willem van der
Cederstrøm, Jan Magne
Jansen, Eystein
author_sort Rutledal, Sunniva
title Tephra horizons identified in the western North Atlantic and Nordic Seas during the Last Glacial Period: Extending the marine tephra framework
title_short Tephra horizons identified in the western North Atlantic and Nordic Seas during the Last Glacial Period: Extending the marine tephra framework
title_full Tephra horizons identified in the western North Atlantic and Nordic Seas during the Last Glacial Period: Extending the marine tephra framework
title_fullStr Tephra horizons identified in the western North Atlantic and Nordic Seas during the Last Glacial Period: Extending the marine tephra framework
title_full_unstemmed Tephra horizons identified in the western North Atlantic and Nordic Seas during the Last Glacial Period: Extending the marine tephra framework
title_sort tephra horizons identified in the western north atlantic and nordic seas during the last glacial period: extending the marine tephra framework
publisher Elsevier
publishDate 2020
url https://hdl.handle.net/11250/2736462
https://doi.org/10.1016/j.quascirev.2020.106247
long_lat ENVELOPE(-34.041,-34.041,63.054,63.054)
geographic Irminger Sea
geographic_facet Irminger Sea
genre Iceland
Labrador Sea
Nordic Seas
North Atlantic
Sea ice
genre_facet Iceland
Labrador Sea
Nordic Seas
North Atlantic
Sea ice
op_source 106247
Quaternary Science Reviews
240
op_relation EC/FP7/610055
urn:issn:0277-3791
https://hdl.handle.net/11250/2736462
https://doi.org/10.1016/j.quascirev.2020.106247
cristin:1800954
Quaternary Science Reviews. 2020, 240, 106247
op_rights Navngivelse 4.0 Internasjonal
http://creativecommons.org/licenses/by/4.0/deed.no
Copyright 2020 The Authors
op_doi https://doi.org/10.1016/j.quascirev.2020.106247
container_title Quaternary Science Reviews
container_volume 240
container_start_page 106247
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