Implications for OSL dating of young sediments(<100 years old): a comparison of OSL ages with independent ages

• 1、CAEP, MOE Key Laboratory of West China's Environmental Systems

Abstract：We explore the use of quartz optically stimulated luminescence dating of young aeolian dust deposits for reconstructing high-resolution chronology on a time scale of decadals. Samples potentially experiencing long/short transpotation are taken from surface layer of buildings on the northern bank of the Yellow River, Lanzhou, China. The maxmium ages of dust deposits are known from historical sources. De values were calculated basing on the luminescent signals measured using SAR protocol in middle aliquots, and range from 0.16 Gy to 1.78 Gy, indicating that the residual luminescent signals can not be ignored. The potential Optical Stimulated Luminescence ages were estimated using dose rate obtained in loess samples on the Loess Plateau in China. And the final results show that even the minimal De components were taken into account, the OSL age of the youngest samples is estimated to be 32 years, which is obviously older than the history of the building. It is thus concluded that luminescent signals of dusts are possibly unbleached before they were buried, however, the Optical Stimulated Luminescence ages and high-resolution chronology can be obtained on time scale of decades. Besides, more caution should be paid to the application of quartz OSL dating on decadal timescale.

keywords： Aeolian dusts OSL signal bleaching

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