<abstract xml:lang="en" xmlns="http://www.w3.org/1999/xhtml"><p>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.</p></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.

Residual Osl Signals from Modern Greenlandic River Sediments

Department of Physical Geography and Quaternary Geology, Stockholm University, SE-106 91 Stockholm, Sweden

Nordic Laboratory for Luminescence Dating, Aarhus University, Risø National Laboratory, DK-4000 Roskilde, Denmark

Geochronometria

{"article-title":"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)...

Residual Osl Signals from Modern Greenlandic River Sediments

Publié en ligne: 14 févr. 2007

Pages: 1 - 9

DOI: https://doi.org/10.2478/v10003-007-0001-6

Mots clés
luminescence dating, OSL, glaciofluvial, fluvial, bleaching, Greenland

This content is open access.

Residual Osl Signals from Modern Greenlandic River Sediments

Publié en ligne: 14 févr. 2007

Pages: 1 - 9

DOI: https://doi.org/10.2478/v10003-007-0001-6

Mots clésluminescence dating, OSL, glaciofluvial, fluvial, bleaching, Greenland

This content is open access.

Mots clés
luminescence dating, OSL, glaciofluvial, fluvial, bleaching, Greenland