Hostname: page-component-586b7cd67f-tf8b9 Total loading time: 0 Render date: 2024-11-29T01:47:24.186Z Has data issue: false hasContentIssue false
  • English
  • Français

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: [email protected]
Rights & Permissions [Opens in a new window]

Abstract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

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 

References

Goodfriend, GA, Stipp, JJ. 1983. Limestone and the problem of radiocarbon dating of land-snail shell carbonate. Geology 11(10):575–7.Google Scholar
Gouveia, MA, Prudêncio, MI, Freitas, MC, Martinho, E, Cabral, JMP. 1987. Interference from uranium fission products in the determination of rare earths, zirconium and ruthenium by instrumental neutron activation analysis in rocks and minerals. Journal of Radioanalytical and Nuclear Chemistry 114(2):309–18.CrossRefGoogle Scholar
Govindaraju, K. 1994. Compilation of working values and sample description for 383 geostandards. Geostandards Newsletter 18. Special Issue. p 1–158.Google Scholar
Haskin, LA, Helmke, PA, Paster, TP, Allen, RO. 1971. Rare earths in meteoritic, terrestrial, and lunar matter. In: Brunfelt, AO, Steinnes, E, editors. Activation Analysis in Geochemistry and Cosmochemistry. Oslo: Universitetsforlaget. p 201–18.Google Scholar
Marques, MM, Ramos, M. 1983. Note sur les formations dunaires actuelles et fossiles des environs de Lisbonne [Note on the current and fossil dune formations of the surroundings of Lisbon, Portugal]. In: Vidal-Romani, JR, Vilas-Martin, F, editors. VI Reunion do Grupo Español de Traballo de Quaternário. Cuadernos do Lab-oratorio Xeolóxico de Laxe 5:597–8. In French.Google Scholar
Moniz, C. 1992. Análise de fracturação. Exemplos de aplicação nas dunas consolidadas de Oitavos e Praia da Aguda. Tema das provas de aptidão pedagógica e capacidade científica, Departamento de Geologia (F.C.U.L.). Lisbon: Universidade de Lisboa. In Portuguese.Google Scholar
Pannell, CL. 2004. Report on the preliminary gastropod findings from Uamh An Ard Achadh (High Pasture Cave), Kilbride, Strath, Isle of Skye, Scotland (NG 5943 1971). Glasgow: University of Glasgow.Google Scholar
Rebêlo, LP. 1998. Dinâmica do sistema dunar do Guincho Oitavos. In: Actas do V Congresso Nacional de Geologia, Lisboa. Comunicações do Instituto Geológico e Mineiro. Tomo 84, Fascículo 1, C83-C84. In Portuguese.Google Scholar
Rebêlo, LP. 2004. Evolução e dinâmica dos sistemas dunares da Manta Rota e do Guincho-Oitavos: dois sistemas distintos na Evolução das dunas costeiras em Portugal [PhD dissertation]. Dissertação referente às provas de acesso à categoria de Investigador Auxiliar do Instituto Geológico e Mineiro (IGM). Alfragide: IGM. 205 p. In Portuguese.Google Scholar
Richter, D, Zink, AJC, Przegietka, KR, Cardoso, GO, Gouveia, MA, Prudêncio, MI. 2003. Source calibrations and blind test results from the new Luminescence Dating Laboratory at the Instituto Tecnológico e Nuclear, Sacavém, Portugal. Ancient TL 21(1):43–8.Google Scholar
Slota, PJ Jr, Jull, AJT, Linick, TW, Toolin, LJ. 1987. Preparation of small samples for 14C accelerator targets by catalytic reduction of CO. Radiocarbon 29(2):303–6.Google Scholar