Preprints
https://doi.org/10.5194/tc-2023-117
https://doi.org/10.5194/tc-2023-117
14 Aug 2023
 | 14 Aug 2023
Status: a revised version of this preprint is currently under review for the journal TC.

Millennial-scale fluctuations of palaeo-ice margin at the southern fringe of the last Fennoscandian Ice Sheet

Karol Tylmann, Wojciech Wysota, Vincent Rinterknecht, Piotr Moska, Aleksandra Bielicka-Giełdoń, and the ASTER Team

Abstract. The paper presents a study of reconstructing chronology and dynamics of palaeo-ice margin oscillations at the southern fringe of the last Fennoscandian Ice Sheet (FIS) based on combined luminescence and 10Be surface exposure dating. The study area is located in northern Poland close to the last FIS maximum limit. Luminescence method was used to date sandy deposits (fluvioglacial sediments and aeolian deposits filling fossil periglacial wedges) intercalating basal till layers, and the most likely age of the tills was constrained by Bayesian modelling. 10Be dating method was used on erratic boulders left during the final retreat of the last FIS and resting on at the surface of glacial landforms. Our results indicate millennial-scale oscillations of the last FIS in northern Poland between ~19 and ~17 ka. The last FIS retreated and re-advanced over a relatively short period of time (2–3 ka), leaving a lithostratigraphic record (basal tills) of three ice re-advances in a millennial cycle: 19.2 ± 1.1 ka, 17.8 ± 0.5 ka and 16.9 ± 0.5 ka. The paper presents the first terrestrial record of millennial-scale palaeo-ice margin oscillations at the southern fringe of the FIS during the last glacial cycle. We explore the dynamics of these oscillations and confront the proposed cycles of the southern FIS advances and retreats with existing patterns of the last deglaciation and millennial-scale fluctuations of the last FIS inferred from marine records.

Karol Tylmann, Wojciech Wysota, Vincent Rinterknecht, Piotr Moska, Aleksandra Bielicka-Giełdoń, and the ASTER Team

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on tc-2023-117', Anonymous Referee #1, 31 Oct 2023
  • RC2: 'Comment on tc-2023-117', Anonymous Referee #2, 05 Nov 2023
Karol Tylmann, Wojciech Wysota, Vincent Rinterknecht, Piotr Moska, Aleksandra Bielicka-Giełdoń, and the ASTER Team
Karol Tylmann, Wojciech Wysota, Vincent Rinterknecht, Piotr Moska, Aleksandra Bielicka-Giełdoń, and the ASTER Team

Viewed

Total article views: 518 (including HTML, PDF, and XML)
HTML PDF XML Total BibTeX EndNote
370 122 26 518 14 10
  • HTML: 370
  • PDF: 122
  • XML: 26
  • Total: 518
  • BibTeX: 14
  • EndNote: 10
Views and downloads (calculated since 14 Aug 2023)
Cumulative views and downloads (calculated since 14 Aug 2023)

Viewed (geographical distribution)

Total article views: 491 (including HTML, PDF, and XML) Thereof 491 with geography defined and 0 with unknown origin.
Country # Views %
  • 1
1
 
 
 
 
Latest update: 28 Feb 2024
Download
Short summary
Our results indicate millennial-scale oscillations of the last Fennoscandian Ice Sheet (FIS) in northern Poland between ~19 and ~17 thousands years ago. Combined luminescence and 10Be dating show that the last FIS left basal tills of three ice re-advances at a millennial-scale cycle: 19.2 ± 1.1 ka, 17.8 ± 0.5 ka and 16.9 ± 0.5 ka. This is the first terrestrial record of millennial-scale palaeo-ice margin oscillations at the southern fringe of the FIS during the last glacial cycle.