A 62 kyr geomagnetic palaeointensity record from the Taymyr Peninsula, Russian Arctic

Type Article
Date 2022
Language English
Author(s) Scheidt Stephanie1, Lenz MatthiasORCID1, Egli Ramon2, Brill DominikORCID3, Klug Martin4, Fabian Karl4, 5, Lenz Marlene M.1, Gromig Raphael1, Rethemeyer Janet1, Wagner Bernd1, Federov Grigory6, 7, Melles Martin1
Affiliation(s) 1 : Institute of Geology and Mineralogy, University of Cologne, 50674, Germany
2 : Central Institute for Meteorology and Geo-dynamics (ZAMG), Vienna, 1190, Austria
3 : Institute of Geography, University of Cologne, Cologne, 50674, Germany
4 : Geological Survey of Norway (NGU), N-7491 Trondheim, Norway
5 : Department of Geoscience and Petroleum, Norwegian University of Science and Technology, Norway
6 : Institute of Earth Sciences, St. Petersburg State University, Russia
7 : Arctic and Antarctic Research Institute, St. Petersburg, Russia
Source Geochronology (2628-3719) (Copernicus GmbH), 2022 , Vol. 4 , N. 1 , P. 87-107
DOI 10.5194/gchron-2021-12

This work represents the first palaeomagnetic study carried out on the sedimentary record of lake Levinson-Lessing, which is the deepest lake in northern Central Siberia. Palaeomagnetic analyses were carried out on 730 discrete samples from the upper 38 m of the 46 m-long core Co1401, which was recovered from the central part of the lake. Alternating field demagnetisation experiments were carried out to obtain the characteristic remanent magnetisation. The relative palaeointensity is determined using the magnetic susceptibility, the anhysteretic remanent magnetization and the isothermal remanent magnetization for normalization of the partial natural remanent magnetization. The chronology of Co1401 derives from accelerated mass spectrometer radiocarbon ages, optically stimulated luminescence dating, and correlation of the relative palaeointensity of 642 discrete samples with the GLOPIS-75 reference curve. This study focuses on the part >10 ka but although includes preliminary results for the upper part of the core. The record includes the geomagnetic excursions Laschamps and Mono Lake, and resolves sufficient geomagnetic features to establish a chronology that continuously covers ~62 ka. The results reveal continuous sedimentation and high sedimentation rate between 45 and 95 cm ka−1. High lock-in depths are suggested from the low variability of the magnetic record compared to data sets of reference records with lower sedimentation rate. Although the horizontal component of the characteristic remanent magnetization can only be used with caution because Co1401 was cored without core segment overlap, the magnetic record of Co1401 is the only high-resolution record of relative palaeointensity and palaeosecular variations from the Arctic tangent cylinder going back to ~62 ka.

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Scheidt Stephanie, Lenz Matthias, Egli Ramon, Brill Dominik, Klug Martin, Fabian Karl, Lenz Marlene M., Gromig Raphael, Rethemeyer Janet, Wagner Bernd, Federov Grigory, Melles Martin (2022). A 62 kyr geomagnetic palaeointensity record from the Taymyr Peninsula, Russian Arctic. Geochronology, 4(1), 87-107. Publisher's official version : https://doi.org/10.5194/gchron-2021-12 , Open Access version : https://archimer.ifremer.fr/doc/00697/80946/