Calcareous nannofossils anchor chronologies for Arctic Ocean sediments back to 500 ka
Abstract Poor age control in Pleistocene sediments of the central Arctic Ocean generates considerable uncertainty in paleoceanographic reconstructions. This problem is rooted in the perplexing magnetic polarity patterns recorded in Arctic marine sediments and the paucity of microfossils capable of p...
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ftopenaccessrep:oai:zenodo.org:138771 2023-10-29T02:33:14+01:00 Calcareous nannofossils anchor chronologies for Arctic Ocean sediments back to 500 ka O'Regan, Matt Backman, Jan Fornaciari, Eliana Jakobsson, Martin West, Gabriel 2020-07-21 https://www.openaccessrepository.it/record/138771 https://doi.org/10.1130/g47479.1 eng eng url:https://www.openaccessrepository.it/communities/itmirror https://www.openaccessrepository.it/record/138771 doi:10.1130/g47479.1 info:eu-repo/semantics/openAccess NEANIAS Atmospheric Research Community Geology info:eu-repo/semantics/article publication-article 2020 ftopenaccessrep https://doi.org/10.1130/g47479.1 2023-10-03T22:18:35Z Abstract Poor age control in Pleistocene sediments of the central Arctic Ocean generates considerable uncertainty in paleoceanographic reconstructions. This problem is rooted in the perplexing magnetic polarity patterns recorded in Arctic marine sediments and the paucity of microfossils capable of providing calibrated biostratigraphic biohorizons or continuous oxygen isotope stratigraphies. Here, we document the occurrence of two key species of calcareous nannofossils in a single marine sediment core from the central Arctic Ocean that provide robust, globally calibrated age constraints for sediments younger than 500 ka. The key species are the coccolithophores Pseudoemiliania lacunosa, which went extinct during marine isotope stage (MIS) 12 (478–424 ka), and Emiliania huxleyi, which evolved during MIS 8 (300–243 ka). This is the first time that P. lacunosa has been described in sediments of the central Arctic Ocean. The sedimentary horizons containing these age-diagnostic species can be traced, through lithostratigraphic correlation, across more than 450 km of the inner Arctic Ocean. They provide the first unequivocal support for proposed Pleistocene chronologies of sediment from this sector of the Arctic, and they constitute a foundation for developing and testing other geochronological tools for dating Arctic marine sediments. Article in Journal/Newspaper Arctic Arctic Ocean Istituto Nazionale di Fisica Nucleare (INFN): Open Access Repository Geology 48 11 1115 1119 |
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Istituto Nazionale di Fisica Nucleare (INFN): Open Access Repository |
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ftopenaccessrep |
language |
English |
topic |
NEANIAS Atmospheric Research Community Geology |
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NEANIAS Atmospheric Research Community Geology O'Regan, Matt Backman, Jan Fornaciari, Eliana Jakobsson, Martin West, Gabriel Calcareous nannofossils anchor chronologies for Arctic Ocean sediments back to 500 ka |
topic_facet |
NEANIAS Atmospheric Research Community Geology |
description |
Abstract Poor age control in Pleistocene sediments of the central Arctic Ocean generates considerable uncertainty in paleoceanographic reconstructions. This problem is rooted in the perplexing magnetic polarity patterns recorded in Arctic marine sediments and the paucity of microfossils capable of providing calibrated biostratigraphic biohorizons or continuous oxygen isotope stratigraphies. Here, we document the occurrence of two key species of calcareous nannofossils in a single marine sediment core from the central Arctic Ocean that provide robust, globally calibrated age constraints for sediments younger than 500 ka. The key species are the coccolithophores Pseudoemiliania lacunosa, which went extinct during marine isotope stage (MIS) 12 (478–424 ka), and Emiliania huxleyi, which evolved during MIS 8 (300–243 ka). This is the first time that P. lacunosa has been described in sediments of the central Arctic Ocean. The sedimentary horizons containing these age-diagnostic species can be traced, through lithostratigraphic correlation, across more than 450 km of the inner Arctic Ocean. They provide the first unequivocal support for proposed Pleistocene chronologies of sediment from this sector of the Arctic, and they constitute a foundation for developing and testing other geochronological tools for dating Arctic marine sediments. |
format |
Article in Journal/Newspaper |
author |
O'Regan, Matt Backman, Jan Fornaciari, Eliana Jakobsson, Martin West, Gabriel |
author_facet |
O'Regan, Matt Backman, Jan Fornaciari, Eliana Jakobsson, Martin West, Gabriel |
author_sort |
O'Regan, Matt |
title |
Calcareous nannofossils anchor chronologies for Arctic Ocean sediments back to 500 ka |
title_short |
Calcareous nannofossils anchor chronologies for Arctic Ocean sediments back to 500 ka |
title_full |
Calcareous nannofossils anchor chronologies for Arctic Ocean sediments back to 500 ka |
title_fullStr |
Calcareous nannofossils anchor chronologies for Arctic Ocean sediments back to 500 ka |
title_full_unstemmed |
Calcareous nannofossils anchor chronologies for Arctic Ocean sediments back to 500 ka |
title_sort |
calcareous nannofossils anchor chronologies for arctic ocean sediments back to 500 ka |
publishDate |
2020 |
url |
https://www.openaccessrepository.it/record/138771 https://doi.org/10.1130/g47479.1 |
genre |
Arctic Arctic Ocean |
genre_facet |
Arctic Arctic Ocean |
op_relation |
url:https://www.openaccessrepository.it/communities/itmirror https://www.openaccessrepository.it/record/138771 doi:10.1130/g47479.1 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1130/g47479.1 |
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Geology |
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48 |
container_issue |
11 |
container_start_page |
1115 |
op_container_end_page |
1119 |
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1781055183682273280 |