Residual OSL signals from modern Greenlandic river sediments

Forskningsoutput: TidskriftsbidragArtikel i vetenskaplig tidskrift

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.

Detaljer

Författare
Externa organisationer
  • Stockholms universitet
  • Aarhus University
Forskningsområden

Ämnesklassifikation (UKÄ) – OBLIGATORISK

  • Geologi

Nyckelord

Originalspråkengelska
Sidor (från-till)1-9
TidskriftGeochronometria
Volym26
StatusPublished - 2007
PublikationskategoriForskning
Peer review utfördJa
Externt publiceradJa