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Helena Alexandersson

Helena Alexanderson

Professor

Helena Alexandersson

Residual OSL signals from modern Greenlandic river sediments

Author

  • Helena Alexanderson

Summary, in 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.

Publishing year

2007

Language

English

Pages

1-9

Publication/Series

Geochronometria

Volume

26

Document type

Journal article

Publisher

WIND-J WOJEWODA PUBLISHING CO.

Topic

  • Geology

Keywords

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

Status

Published

ISBN/ISSN/Other

  • ISSN: 1897-1695