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2007 vol. 26
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RESEARCH PAPER
Residual Osl Signals from Modern Greenlandic River Sediments
Helena Alexanderson
 
 
 
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Online publication date: 2007-02-14
 
 
Publication date: 2007-01-01
 
 
Geochronometria 2007;26:1-9
DOI: https://doi.org/10.2478/v10003-007-0001-6
 
 
Article (PDF)
References (40)
 
KEYWORDS
luminescence dating
OSL
glaciofluvial
fluvial
bleaching
Greenland
 
ABSTRACT
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.
 
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