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Helena Alexandersson

Helena Alexanderson

Professor

Helena Alexandersson

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

Författare

  • 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.

Avdelning/ar

  • Kvartärgeologi

Publiceringsår

2015

Språk

Engelska

Sidor

1-16

Publikation/Tidskrift/Serie

Geochronometria

Volym

42

Issue

1

Dokumenttyp

Artikel i tidskrift

Förlag

WIND-J WOJEWODA PUBLISHING CO.

Ämne

  • Geology

Nyckelord

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

Status

Published

Projekt

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

Forskningsgrupp

  • Lund Luminescence Laboratory

ISBN/ISSN/Övrigt

  • ISSN: 1897-1695