Preprints
https://doi.org/10.5194/gchron-2021-12
https://doi.org/10.5194/gchron-2021-12

  03 Jun 2021

03 Jun 2021

Review status: this preprint is currently under review for the journal GChron.

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

Stephanie Scheidt1, Matthias Lenz1, Ramon Egli2, Dominik Brill3, Martin Klug4, Karl Fabian4,5, Marlene M. Lenz1, Raphael Gromig1, Janet Rethemeyer1, Bernd Wagner1, Grigory Federov6,7, and Martin Melles1 Stephanie Scheidt et al.
  • 1Institute of Geology and Mineralogy, University of Cologne, 50674, Germany
  • 2Central Institute for Meteorology and Geo-dynamics (ZAMG), Vienna, 1190, Austria
  • 3Institute of Geography, University of Cologne, Cologne, 50674, Germany
  • 4Geological Survey of Norway (NGU), N-7491 Trondheim, Norway
  • 5Department of Geoscience and Petroleum, Norwegian University of Science and Technology, Norway
  • 6Institute of Earth Sciences, St. Petersburg State University, Russia
  • 7Arctic and Antarctic Research Institute, St. Petersburg, Russia

Abstract. 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.

Stephanie Scheidt et al.

Status: open (until 15 Jul 2021)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse

Stephanie Scheidt et al.

Stephanie Scheidt et al.

Viewed

Total article views: 304 (including HTML, PDF, and XML)
HTML PDF XML Total BibTeX EndNote
88 211 5 304 3 3
  • HTML: 88
  • PDF: 211
  • XML: 5
  • Total: 304
  • BibTeX: 3
  • EndNote: 3
Views and downloads (calculated since 03 Jun 2021)
Cumulative views and downloads (calculated since 03 Jun 2021)

Viewed (geographical distribution)

Total article views: 275 (including HTML, PDF, and XML) Thereof 275 with geography defined and 0 with unknown origin.
Country # Views %
  • 1
1
 
 
 
 
Latest update: 23 Jun 2021
Download
Short summary
Levinson-Lessing Lake in northern central Siberia provides an exceptional archive for the evolution of the Earth's magnetic field in the Arctic. This is the first palaeomagnetic study carried out at the lake and presents the relative palaeointensity and palaeosecular variation of the upper 38 m of sediment core Co1401, spanning ~62 ka. A comparable high-resolution record of this time does not exist in the Eurasian Arctic.