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Residual OSL signals from modern Greenlandic river sediments
Stockholm University, Faculty of Science, Department of Physical Geography and Quaternary Geology.
2007 (English)In: Geochronometria, ISSN 1897-1695, Vol. 26, 1-9 p.Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
2007. Vol. 26, 1-9 p.
URN: urn:nbn:se:su:diva-12772DOI: doi:10.2478/v10003-007-0001-6ISI: 000246628600001OAI: diva2:179292
Available from: 2008-02-02 Created: 2008-02-02 Last updated: 2011-01-11Bibliographically approved

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Alexanderson, Helena
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Department of Physical Geography and Quaternary Geology

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