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Carlos Arce-Chamorro
Unidade de Xeocronoloxía- Instituto Universitario de Xeoloxía, Universidade da Coruña. ESCI, Campus de Elviña. 15071, A Coruña, España
Jorge Sanjurjo-Sánchez
Unidade de Xeocronoloxía- Instituto Universitario de Xeoloxía, Universidade da Coruña. ESCI, Campus de Elviña. 15071, A Coruña, España
Vol. 42 (2020), Articles, pages 169-192
Submitted: Dec 17, 2020 Published: Dec 28, 2020
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In this work, we have estimated the equivalent dose (De) from the OSL signal from quartz, for fluvial deposits of the Upper Pleistocene in the Mero River basin (A Coruña, Galicia, Spain) and preserved in the Ria of Coruña coastal margin (NW Iberian Peninsule). Such deposits show De distributions more scattered than expected, providing unexpected high over-dispersion percentages of the mean (OD> 20%). These values are usually correlated to incomplete-bleaching of the OSL signal due to the transport of quartz grains under turbulent conditions as a consequence of high suspended sediment loads. However, both distribution plots and normality-test show normal, symmetric and central distributions. No evidence of two or more populations in aliquots due to two groups of grains, namely y (i) one group of grains with well-bleached signals before the last burial event and (ii) another group of grains which an inherited signal from a previous burial episode. Moreover, Dose-Recovery experiments on quartz grains show that the high dispersion is due to external and not internal factors. Thus, we have analyzed the activity concentration of radioisotopes in samples and the concentration of potassium in several grain-sizes, to assess if the origin of over-dispersion is microdosimetry caused by 40K from potassium, given the low dose rates (Dr) measured in samples. Results show that this is the most probable cause of dispersion, and no evidence of partial bleaching is found.

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