Residual OSL signals from modern greenlandic river sediments

• Autorzy: Alexanderson, H.
• Języki publikacji: EN

Abstrakty

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.

Słowa kluczowe

EN

luminescence dating; OSL dating; glaciofluvial; fluvial; bleaching; Greenland

• Czasopismo: Geochronometria
• Rocznik: 2007
• Tom: Vol. 26
• Strony: 1-9
• Opis fizyczny: Bibliogr. 40 poz., rys., tab.

Twórcy

autor

Alexanderson, H.

• Department of Physical Geography and Quaternary Geology,Stockholm University, SE-106 91 Stockholm, Sweden, Nordic Laboratory for Luminescence Dating,Aarhus University, Riso National Laboratory, DK-4000 Roskilde, Denmark,

Bibliografia

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