The Norwegian-Greenland Sea, the Laschamps, and the Mono Lake Excursions Recorded in a Black Sea Sedimentary Sequence Spanning From 68.9 to 14.5 ka
A full-vector paleomagnetic record, comprising directional data and relative paleointensity (rPI), was derived from 16 sediment cores recovered from the southeastern Black Sea. The obtained data were used to create a stack covering the time window between 68.9 and 14.5 ka. Age models are based on ra...
Published in: | Journal of Geophysical Research: Solid Earth |
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ftsubggeo:oai:e-docs.geo-leo.de:11858/9131 2023-05-15T16:26:17+02:00 The Norwegian-Greenland Sea, the Laschamps, and the Mono Lake Excursions Recorded in a Black Sea Sedimentary Sequence Spanning From 68.9 to 14.5 ka Liu, Jiabo Nowaczyk, Norbert R. Panovska, Sanja Korte, Monika Arz, Helge W. 2020 https://doi.org/10.1029/2019JB019225 http://resolver.sub.uni-goettingen.de/purl?gldocs-11858/9131 eng eng doi:10.1029/2019JB019225 http://resolver.sub.uni-goettingen.de/purl?gldocs-11858/9131 This is an open access article under the terms of the Creative Commons Attribution-NonCommercial License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited and is not used for commercial purposes. CC-BY-NC ddc:538.7 Black Sea Norwegian-Greenland Sea excursion Laschamps excursion Mono Lake excursion paleosecular variations doc-type:article 2020 ftsubggeo https://doi.org/10.1029/2019JB019225 2022-11-09T06:51:40Z A full-vector paleomagnetic record, comprising directional data and relative paleointensity (rPI), was derived from 16 sediment cores recovered from the southeastern Black Sea. The obtained data were used to create a stack covering the time window between 68.9 and 14.5 ka. Age models are based on radiocarbon dating and correlations of warming/cooling cycles monitored by high-resolution X-ray fluorescence (XRF) elementary ratios and by ice-rafted debris (IRD) in Black Sea sediments to the sequence of “Dansgaard-Oeschger” (D-O) events defined from the Greenland ice core oxygen isotope stratigraphy. The reconstructed prominent lows in paleointensity at about 64.5, 41.2, and 34.5 ka are coeval with the Norwegian-Greenland Sea, the Laschamps, and the Mono Lake excursions, respectively. For a further analysis, the stacked Black Sea paleomagnetic record was converted into one component being parallel to the direction expected from a geocentric axial dipole (GAD) and two components perpendicular to it (EW, inclined NS), representing definitely only non-GAD components of the geomagnetic field. Discussions of the field configurations at the Black Sea site are focused on the three excursional events. The Norwegian-Greenland Sea excursion was dominated by a decaying axial dipole and persisting weak nondipole field, with directional variations still within the range of normal secular variations. The Laschamps excursion comprises two full polarity transitions and a short stable interval of reversed polarity in between. The Mono Lake excursion was mostly dominated by a nondipole field, though with a less pronounced weakening of the axial dipole component. Article in Journal/Newspaper Greenland Greenland ice core Greenland Sea ice core GEO-LEOe-docs (FID GEO) Greenland Journal of Geophysical Research: Solid Earth 125 8 |
institution |
Open Polar |
collection |
GEO-LEOe-docs (FID GEO) |
op_collection_id |
ftsubggeo |
language |
English |
topic |
ddc:538.7 Black Sea Norwegian-Greenland Sea excursion Laschamps excursion Mono Lake excursion paleosecular variations |
spellingShingle |
ddc:538.7 Black Sea Norwegian-Greenland Sea excursion Laschamps excursion Mono Lake excursion paleosecular variations Liu, Jiabo Nowaczyk, Norbert R. Panovska, Sanja Korte, Monika Arz, Helge W. The Norwegian-Greenland Sea, the Laschamps, and the Mono Lake Excursions Recorded in a Black Sea Sedimentary Sequence Spanning From 68.9 to 14.5 ka |
topic_facet |
ddc:538.7 Black Sea Norwegian-Greenland Sea excursion Laschamps excursion Mono Lake excursion paleosecular variations |
description |
A full-vector paleomagnetic record, comprising directional data and relative paleointensity (rPI), was derived from 16 sediment cores recovered from the southeastern Black Sea. The obtained data were used to create a stack covering the time window between 68.9 and 14.5 ka. Age models are based on radiocarbon dating and correlations of warming/cooling cycles monitored by high-resolution X-ray fluorescence (XRF) elementary ratios and by ice-rafted debris (IRD) in Black Sea sediments to the sequence of “Dansgaard-Oeschger” (D-O) events defined from the Greenland ice core oxygen isotope stratigraphy. The reconstructed prominent lows in paleointensity at about 64.5, 41.2, and 34.5 ka are coeval with the Norwegian-Greenland Sea, the Laschamps, and the Mono Lake excursions, respectively. For a further analysis, the stacked Black Sea paleomagnetic record was converted into one component being parallel to the direction expected from a geocentric axial dipole (GAD) and two components perpendicular to it (EW, inclined NS), representing definitely only non-GAD components of the geomagnetic field. Discussions of the field configurations at the Black Sea site are focused on the three excursional events. The Norwegian-Greenland Sea excursion was dominated by a decaying axial dipole and persisting weak nondipole field, with directional variations still within the range of normal secular variations. The Laschamps excursion comprises two full polarity transitions and a short stable interval of reversed polarity in between. The Mono Lake excursion was mostly dominated by a nondipole field, though with a less pronounced weakening of the axial dipole component. |
format |
Article in Journal/Newspaper |
author |
Liu, Jiabo Nowaczyk, Norbert R. Panovska, Sanja Korte, Monika Arz, Helge W. |
author_facet |
Liu, Jiabo Nowaczyk, Norbert R. Panovska, Sanja Korte, Monika Arz, Helge W. |
author_sort |
Liu, Jiabo |
title |
The Norwegian-Greenland Sea, the Laschamps, and the Mono Lake Excursions Recorded in a Black Sea Sedimentary Sequence Spanning From 68.9 to 14.5 ka |
title_short |
The Norwegian-Greenland Sea, the Laschamps, and the Mono Lake Excursions Recorded in a Black Sea Sedimentary Sequence Spanning From 68.9 to 14.5 ka |
title_full |
The Norwegian-Greenland Sea, the Laschamps, and the Mono Lake Excursions Recorded in a Black Sea Sedimentary Sequence Spanning From 68.9 to 14.5 ka |
title_fullStr |
The Norwegian-Greenland Sea, the Laschamps, and the Mono Lake Excursions Recorded in a Black Sea Sedimentary Sequence Spanning From 68.9 to 14.5 ka |
title_full_unstemmed |
The Norwegian-Greenland Sea, the Laschamps, and the Mono Lake Excursions Recorded in a Black Sea Sedimentary Sequence Spanning From 68.9 to 14.5 ka |
title_sort |
norwegian-greenland sea, the laschamps, and the mono lake excursions recorded in a black sea sedimentary sequence spanning from 68.9 to 14.5 ka |
publishDate |
2020 |
url |
https://doi.org/10.1029/2019JB019225 http://resolver.sub.uni-goettingen.de/purl?gldocs-11858/9131 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland Greenland ice core Greenland Sea ice core |
genre_facet |
Greenland Greenland ice core Greenland Sea ice core |
op_relation |
doi:10.1029/2019JB019225 http://resolver.sub.uni-goettingen.de/purl?gldocs-11858/9131 |
op_rights |
This is an open access article under the terms of the Creative Commons Attribution-NonCommercial License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited and is not used for commercial purposes. |
op_rightsnorm |
CC-BY-NC |
op_doi |
https://doi.org/10.1029/2019JB019225 |
container_title |
Journal of Geophysical Research: Solid Earth |
container_volume |
125 |
container_issue |
8 |
_version_ |
1766015194380632064 |