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New luminescence ages reveal early to Middle Weichselian deposits in central Latvia

Author:
  • Kristaps Lamsters
  • Edyta Kalinska-Nartisa
  • Vitālijs Zelčs
  • Helena Alexanderson
Publishing year: 2017-03-09
Language: English
Pages: 480-490
Publication/Series: Geological Quarterly
Volume: 61
Issue: 2
Document type: Journal article
Publisher: Polish Geological Institute

Abstract english

New optically stimulated luminescence (OSL) ages show that sandy deposits overlain by Late Weichselian subglacial till in central Latvia are of Early to Middle Weichselian age. The finer chronological resolution of unconsolidated sediment deposition in the Central Latvian Lowland (CLL) remains relatively unstudied, and here we provide a first characterisation of the deposits with respect to their age. Three OSL ages ranging between 84 ± 9 ka and 112 ± 11 ka suggest that the deposits studied in the CLL are of Early Weichselian age (MIS 5). We found no Middle Weichselian deposits in the CLL, and assume that any such younger sediments might have been eroded during the advance of the Zemgale Lobe in the Late Weichselian. One site, in the ice-marginal zone adjacent to the interlobate area, has nevertheless deposits dated to 44 ± 10 ka corresponding to the Middle Weichselian (MIS 3). Our results are compatible with existing ESR ages on three sets of Portlandia arctica shells from the central part of the lowland; the shells had been incorporated into glacial deposits during later glacial advances. Finally, our findings largely support ice-free conditions during the Early and Middle Weichselian in the middle and southern part of central Latvia.

Keywords

  • Geology
  • Central latvia
  • Early weichselian
  • Middle weichselian
  • Optically stimulated luminescence (OSL) dating
  • Subglacial bedforms

Other

Published
  • ISSN: 1641-7291
Helena Alexandersson
E-mail: helena [dot] alexanderson [at] geol [dot] lu [dot] se

Professor

Quaternary Sciences

+46 46 222 44 83

435

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Aeolian sand project

Project members
Members of the aeolian sand project: Martin Bernhardson, Sara Florén, Edyta Kalińska-Nartiša and Helena Alexanderson.

Read more about the project here.