Residual Doses in Recent Alluvial Sediments From the Ardenne (S Belgium)
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Laboratory of Mineralogy and Petrology (Luminescence Research Group), Geological Institute, Ghent University, Krijgslaan 281 (S8), B-9000 Gent, Belgium
Unité de Géographie physique et Quaternaire, Hydrographie et géomorphologie fluviatile, Institut de Géographie, B-4000 Liège, Belgium
Online publication date: 2007-10-18
Publication date: 2007-12-01
Geochronometria 2007;28:1-8
We report on our first investigations into the potential of optical dating for determining the rate of river flood sedimentation in the Ardenne region (S Belgium). Two samples collected from a recent alluvial deposit were used to investigate the extent of resetting in different particle size fractions of quartz (4-11 μm, 63-90 μm, 90-125 μm, 125-180 μm, 180-212 μm and 212-250 μm) as well as in polymineral fine (4-11 μm) grains. Both samples show satisfactory OSL and IRSL characteristics. The IRSL signals from the polymineral fine grains yield an equivalent dose (De) of 3-4 Gy, while a De of 0.3-0.6 Gy was measured using large aliquots of quartz. Small aliquot analyses of 63-90 μm and 212-250 μm quartz grains confirm that the coarser fraction contains more grains with lower De's. Furthermore, for a modern sample (< 3 years old), ~60% of the aliquots yields a De consistent with zero, indicating that these contain only well-bleached grains. These findings suggest that it might be possible to extract the true burial dose from dose distributions measured using small aliquots of coarse-grained (e.g. 212-250 μm) quartz.
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