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Helena Alexandersson

Helena Alexanderson

Professor

Helena Alexandersson

Holocene Chronology of the Brattforsheden Delta and Inland Dune Field, SW Sweden

Author

  • Helena Alexanderson
  • Derek Fabel

Summary, in English

Brattforsheden is a large glacifluvial deposit in southwestern Sweden and associated with it is one of Sweden's largest inland dune fields. Although the relative ages of the Brattforsheden deposits are well known, absolute ages from the area are few. In this study we have used optically stimulated luminescence (OSL), surface exposure (Be-10) and radiocarbon (C-14) dating to provide an absolute chronology for the deglaciation and for the Holocene development of the aeolian dunes. Our data show that the deglaciation took place just before 11 ka (11.5 +/- 0.6 ka OSL, 11.3 +/- 0.8 ka Be-10), in line with the C-14-based regional deglaciation age. Aeolian dunes started forming immediately after deglaciation and were active for at least 2000 years, well after vegetation had established. Renewed aeolian activity occurred 270-180 years ago, resulting in the deposition of sand sheets. Comparison between dating methods and studies of OSL dose distributions show that glacial, glacifluvial and littoral sediments suffer from incomplete bleaching and thus that mean OSL ages from such deposits overestimate the true depositional age. By using small aliquots and statistical age models, this effect can partly be countered. Also, some of the Be-10 ages appear too old, which may be due to previous exposure.

Department/s

  • Quaternary Sciences

Publishing year

2015

Language

English

Pages

1-16

Publication/Series

Geochronometria

Volume

42

Issue

1

Document type

Journal article

Publisher

WIND-J WOJEWODA PUBLISHING CO.

Topic

  • Geology

Keywords

  • luminescence (OSL) dating
  • surface exposure dating (Be-10)
  • deglaciation
  • aeolian
  • Holocene
  • Sweden

Status

Published

Project

  • Lund Luminescence Laboratory
  • Aeolian activity in Sweden: an unexplored environmental archive

Research group

  • Lund Luminescence Laboratory

ISBN/ISSN/Other

  • ISSN: 1897-1695