1. bookVolume 26 (2007): Issue -1 (March 2007)
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eISSN
1897-1695
ISSN
1733-8387
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04 Jul 2007
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1 time per year
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English
Open Access

Residual Osl Signals from Modern Greenlandic River Sediments

Published Online: 14 Feb 2007
Volume & Issue: Volume 26 (2007) - Issue -1 (March 2007)
Page range: 1 - 9
Journal Details
License
Format
Journal
eISSN
1897-1695
ISSN
1733-8387
First Published
04 Jul 2007
Publication timeframe
1 time per year
Languages
English
Residual Osl Signals from Modern Greenlandic River Sediments

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 (~1.1 Gy) than sand grains (~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 (~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°C are used.

Keywords

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