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Helena Alexandersson

Helena Alexanderson

Professor

Helena Alexandersson

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

Author

  • Kristaps Lamsters
  • Edyta Kalinska-Nartisa
  • Vitālijs Zelčs
  • Helena Alexanderson

Summary, in 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.

Department/s

  • Quaternary Sciences

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

Topic

  • Geology

Keywords

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

Status

Published

ISBN/ISSN/Other

  • ISSN: 1641-7291