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Residual OSL signals from modern Greenlandic river sediments

Alexanderson, Helena LU (2007) In Geochronometria 26. p.1-9
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 (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... (More)
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. (Less)
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author
publishing date
type
Contribution to journal
publication status
published
subject
keywords
luminescence dating, OSL, glaciofluvial, fluvial, bleaching, Greenland
in
Geochronometria
volume
26
pages
1 - 9
publisher
WIND-J WOJEWODA PUBLISHING CO.
external identifiers
  • wos:000246628600001
  • scopus:34547540845
ISSN
1897-1695
DOI
10.2478/v10003-007-0001-6
language
English
LU publication?
no
id
683cca35-0515-4170-83a5-9ac04dcd8b0c (old id 4450055)
date added to LUP
2014-05-26 09:28:45
date last changed
2017-09-10 03:49:48
@article{683cca35-0515-4170-83a5-9ac04dcd8b0c,
  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 (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.},
  author       = {Alexanderson, Helena},
  issn         = {1897-1695},
  keyword      = {luminescence dating,OSL,glaciofluvial,fluvial,bleaching,Greenland},
  language     = {eng},
  pages        = {1--9},
  publisher    = {WIND-J WOJEWODA PUBLISHING CO.},
  series       = {Geochronometria},
  title        = {Residual OSL signals from modern Greenlandic river sediments},
  url          = {http://dx.doi.org/10.2478/v10003-007-0001-6},
  volume       = {26},
  year         = {2007},
}