Variabilidad en la micro-dosimetría beta del sedimento como principal causa de dispersión en la datación OSL de los depósitos fluviales costeros fini-pleistocenos conservados en la Cuenca del Río Mero (A Coruña, Galicia, España)

  1. CARLOS ARCE-CHAMORRO 1
  2. JORGE SANJURJO-SÁNCHEZ 1
  1. 1 Universidade da Coruña. Unidade de Xeocronoloxía- Instituto Universitario de Xeoloxía
Revista:
Cadernos do Laboratorio Xeolóxico de Laxe: Revista de xeoloxía galega e do hercínico peninsular

ISSN: 0213-4497

Año de publicación: 2020

Número: 42

Páginas: 169-192

Tipo: Artículo

DOI: 10.17979/CADLAXE.2020.42.0.7308 DIALNET GOOGLE SCHOLAR lock_openAcceso abierto editor

Otras publicaciones en: Cadernos do Laboratorio Xeolóxico de Laxe: Revista de xeoloxía galega e do hercínico peninsular

Objetivos de desarrollo sostenible

Resumen

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 grainsizes, 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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