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Radiocarbon and Blue Optically Stimulated Luminescence Chronologies of the Oitavos Consolidated Dune (Western Portugal)

Published online by Cambridge University Press:  18 July 2016

M I Prudêncio ,
R Marques ,
L Rebelo ,
G T Cook ,
G O Cardoso ,
P Naysmith ,
S P H T Freeman ,
D Franco ,
P Brito  and
M I Dias
M I Prudêncio*
Affiliation:
Instituto Tecnológico e Nuclear, EN 10, Sacavém, 2686-953, Portugal
R Marques
Affiliation:
Instituto Tecnológico e Nuclear, EN 10, Sacavém, 2686-953, Portugal
L Rebelo
Affiliation:
Departamento de Geologia Marinha, Instituto Nacional de Engenharia, Tecnologia e InovaçÃo (INETI), Lisbon, Portugal
G T Cook
Affiliation:
SUERC, Scottish Enterprise Technology Park, East Kilbride, G75 0QF, United Kingdom
G O Cardoso
Affiliation:
Instituto Tecnológico e Nuclear, EN 10, Sacavém, 2686-953, Portugal
P Naysmith
Affiliation:
SUERC, Scottish Enterprise Technology Park, East Kilbride, G75 0QF, United Kingdom
S P H T Freeman
Affiliation:
SUERC, Scottish Enterprise Technology Park, East Kilbride, G75 0QF, United Kingdom
D Franco
Affiliation:
Instituto Tecnológico e Nuclear, EN 10, Sacavém, 2686-953, Portugal
P Brito
Affiliation:
Departamento de Geologia Marinha, Instituto Nacional de Engenharia, Tecnologia e InovaçÃo (INETI), Lisbon, Portugal
M I Dias
Affiliation:
Instituto Tecnológico e Nuclear, EN 10, Sacavém, 2686-953, Portugal
*
Corresponding author. Email: iprudenc@itn.pt
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Abstract

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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.

Type
Articles
Information
Radiocarbon , Volume 49 , Issue 2 , 2007 , pp. 1145 - 1151
Copyright
Copyright © 2007 by the Arizona Board of Regents on behalf of the University of Arizona 

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