IRSL and post-IR IRSL residual doses recorded in modern dust samples from the Chinese Loess Plateau
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Nordic Laboratory for Luminescence Dating, Department of Earth Sciences, Aarhus University, Risø DTU, DK-4000, Roskilde, Denmark
Laboratory of Mineralogy and Petrology, Department of Geology and Soil Science, Ghent University, B-9000, Ghent, Belgium
School of Geographical and Oceanographical Sciences, Nanjing University, Nanjing, 210093, China
Online publication date: 2011-09-22
Publication date: 2011-12-01
Geochronometria 2011;38(4):432-440
Using a set of modern/young (0 to about 200 years old) dust samples collected from the Chinese Loess Plateau the bleachability of IRSL measured at 50°C (IR50) and post-IR50 elevated temperature IRSL (measured at 225°C and at 290°C) is investigated by measuring the apparent (residual) doses recorded by these signals. Doses recorded by quartz OSL are used as a reference. Allowing for differences in dose rates it seems that both IRSL and post-IR IRSL signals yield residual doses that are significantly larger than the doses measured in quartz. These residual doses can be largely explained by thermal transfer caused by preheating. Nevertheless, we advise against the use of a low temperature preheat (<200°C) with IR50 to date loess samples because, as has been reported before, the signal appears to be thermally unstable. In general, we conclude that it may not be advisable to apply post-IR IRSL dating to Chinese loess samples where residuals of up to ∼20 Gy are a significant fraction of the total dose. However, these residuals quickly become unimportant when dating older samples, and this is the age range in which post-IR IRSL dating is likely to be most useful.
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