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Residual OSL signals from modern Greenlandic river sediments

Author:
  • Helena Alexanderson
Publishing year: 2007
Language: English
Pages: 1-9
Publication/Series: Geochronometria
Volume: 26
Document type: Journal article
Publisher: WIND-J WOJEWODA PUBLISHING CO.

Abstract english

Ripple-laminated sandy deposits at shallow water depths in four rivers on Jameson Land, East Greenland were sampled for optically stimulated luminescence (OSL) dating. Silt-sized grains have significantly higher equivalent doses (similar to 1.1 Gy) than sand grains (similar to 0.1 Gy). This suggests that coarse grain-size fractions are better bleached and more suitable than fine grains for OSL dating of glaciofluvial/fluvial sediments. A sample from a sidebar deposited during the spring flood yielded 1.0 Gy (similar to 500 years) while a subaerial deposit was completely zeroed. The spring flood deposit is considered to be most similar to deglacial conditions and incomplete bleaching of this amount (1 Gy) is generally not a significant source of error for sediments of Pleistocene age. Most samples have rather poor luminescence characteristics and are affected by thermal transfer if preheat temperatures at or above 260 degrees C are used.

Keywords

  • Geology
  • luminescence dating
  • OSL
  • glaciofluvial
  • fluvial
  • bleaching
  • Greenland

Other

Published
  • ISSN: 1897-1695
Helena Alexandersson
E-mail: helena [dot] alexanderson [at] geol [dot] lu [dot] se

Professor

Quaternary Sciences

+46 46 222 44 83

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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.