Radiocarbon and blue optically stimulated luminescence chronologies of the Oitavos consolidated dune (Western Portugal)

Prudncio, M. I., Marques, R., Rebelo, L., Cook, G. T. , Cardoso, G. O., Naysmith, P. , Freeman, S. T. , Franco, D. and Brito, P. (2007) Radiocarbon and blue optically stimulated luminescence chronologies of the Oitavos consolidated dune (Western Portugal). Radiocarbon, 49(2), pp. 1145-1151.

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Publisher's URL: https://journals.uair.arizona.edu/index.php/radiocarbon/article/view/3005

Abstract

The dune of Oitavos, the underlying paleosol, and Helix sp. gastropod shells found within the paleosol were dated using a combination of radiocarbon and blue optically stimulated luminescence (OSL). The organic component of the paleosol produced a significantly older age (~20,000 cal BP) than the OSL age measurement (~15,000 yr), while 14C age measurements on the inorganic component and the gastropods produced ages of ~35,000 yr and ~34,000 yr, respectively. Rare-earth element analyses provide evidence that the gastropods incorporate geological carbonate, making them an unreliable indicator of the age of the paleosol. We propose that the 14C age of the small organic component of the paleosol is also likely to be unreliable due to incorporation of residual material. The OSL age measurement of the upper paleosol (~15,000 yr) is consistent with the age for the base of the dune (~14,500 yr). The younger OSL age for the top of the dune (~12,000 yr) suggests that it was built up by at least 2 sand pulses or that there was a remobilization of material at the top during its evolution, prior to consolidation.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Cook, Professor Gordon and Freeman, Professor Stewart and Naysmith, Mr Philip
Authors: Prudncio, M. I., Marques, R., Rebelo, L., Cook, G. T., Cardoso, G. O., Naysmith, P., Freeman, S. T., Franco, D., and Brito, P.
College/School:College of Science and Engineering > Scottish Universities Environmental Research Centre
Journal Name:Radiocarbon
Publisher:University of Arizona
ISSN:0033-8222
Copyright Holders:Copyright © 2007 The Authors
First Published:First published in Radiocarbon 49(2):1145-1151
Publisher Policy:Reproduced under a Creative Commons License

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