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Article Dans Une Revue (Article De Synthèse) Quaternary Geochronology Année : 2024

Testing the accuracy of single-grain OSL dating on Eemian quartz samples

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Single-grain OSL dating of quartz is a popular approach to OSL dating, even when incomplete bleaching is not likely to be significant. However, little testing of the accuracy of single-grain dating has been published; particularly for samples older than 50 ka. In this study, we investigate the accuracy of single-grain quartz OSL dating, when a significant number of individual grains are no longer able to accurately measure the burial dose because of saturation effects. We compare standard multi-grain OSL results with those obtained from single-grain OSL measurements for five OIS substage 5e (Eemian) samples (∼128 ka). We show that for these samples, standard multi-grain quartz dose estimation results in dose estimates in good agreement with the predicted doses (four of the five samples recover age control), but that standard frequentist single-grain dating procedures significantly underestimate the age controls, i.e. the measured to predicted dose range between 0.42±0.03 and 0.84±0.06, where the underestimation increases with increasing relative number of grains in saturation. Attempting to remove the inevitable bias in the dose estimation resulting from a significant number of saturated grains (by using the Dc criterion) reduced the underestimation, i.e. the measured to predicted dose range between 0.63±0.05 and 0.94±0.08, but only the sample with the smallest absorbed dose is consistent with the age control. Using Bayesian analysis (“BayLum”) the ratio of measured to predicted dose range between 0.75±0.07 and 1.14±0.08, but only two of the five samples agree with the independent age control. Our results have implications for the evaluation of single-grain OSL dating of quartz in the 100-200 Gy natural dose range.
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insu-04660561 , version 1 (24-07-2024)

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Frederik H Baumgarten, Kristina J Thomsen, Guillaume Guérin, Jan-Pieter Buylaert, Andrew S Murray. Testing the accuracy of single-grain OSL dating on Eemian quartz samples. Quaternary Geochronology, In press, pp.101602. ⟨10.1016/j.quageo.2024.101602⟩. ⟨insu-04660561⟩
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