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Wood 14C Dating with AixMICADAS: Methods and Application to Tree-Ring Sequences from the Younger Dryas Event in the Southern French Alps

Published online by Cambridge University Press:  18 September 2017

Manuela Capano ,
Cécile Miramont ,
Frédéric Guibal ,
Bernd Kromer ,
Thibaut Tuna ,
Yoann Fagault  and
Edouard Bard
Manuela Capano*
Affiliation:
CEREGE, Aix-Marseille University, CNRS, IRD, Collège de France, Technopôle de l’Arbois, BP 80, F-13545 Aix-en-Provence, France
Cécile Miramont
Affiliation:
IMBE, Aix-Marseille University, CNRS, IRD, Avignon University, Technopôle de l’Arbois, 13545 Aix-en-Provence, France
Frédéric Guibal
Affiliation:
IMBE, Aix-Marseille University, CNRS, IRD, Avignon University, Technopôle de l’Arbois, 13545 Aix-en-Provence, France
Bernd Kromer
Affiliation:
Institute of Environmental Physics, University of Heidelberg, Germany
Thibaut Tuna
Affiliation:
CEREGE, Aix-Marseille University, CNRS, IRD, Collège de France, Technopôle de l’Arbois, BP 80, F-13545 Aix-en-Provence, France
Yoann Fagault
Affiliation:
CEREGE, Aix-Marseille University, CNRS, IRD, Collège de France, Technopôle de l’Arbois, BP 80, F-13545 Aix-en-Provence, France
Edouard Bard*
Affiliation:
CEREGE, Aix-Marseille University, CNRS, IRD, Collège de France, Technopôle de l’Arbois, BP 80, F-13545 Aix-en-Provence, France
*
*Corresponding authors. Email: capano@cerege.fr; bard@cerege.fr.
*Corresponding authors. Email: capano@cerege.fr; bard@cerege.fr.
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Abstract

The AixMICADAS facility is in part dedicated to research on radiocarbon (14C) calibration by means of various archives. For this purpose, we are improving upon the capacity to accurately date subfossil wood. In the current study, nine chemical pretreatment protocols are tested on six wood samples of known ages. The optimization based on 14C ages, 13C/12C ratios, carbon % and overall mass yield % leads us to favor the acid-base-acid-bleaching pretreatment (ABA-B). This efficient method is shown to provide a residue of holocellulose with optimal blanks equivalent to an age of 51,300 14C BP with a standard deviation of 1500 yr based on 25 analyses. The seven wood samples from the Sixth International Radiocarbon Intercomparison (SIRI) are then analyzed as a further verification of the accuracy of our method. As a first scientific contribution, we studied two tree-ring sequences from subfossil pines (Barb12 and Barb17) collected in the southern French Alps. New 14C analyses were performed at high resolution (every third year) and are shown to agree well with results obtained previously by high precision β-counting on CO2 from large samples at lower resolution for Barb17 and accelerator mass spectrometry (AMS) data for Barb12. The new 14C series are then matched to the Kauri and YDB chronologies: the new sequence of Barb12-17 tentatively corresponds to the interval between 12,836 and 12,594 cal BP within the Younger Dryas cold period. The 14C comparison between the Barb12-17 sequence from France and the Kauri sequence from New Zealand allows calculating the 14C Inter-Hemispheric Gradient (IHG), with an average value of ca. 57 yr. The IHG stayed relatively high throughout the studied period. Interestingly, the IHG exhibits a transient maximum value (ca. 100 yr) during the period of rapid Δ14C rise (12,750–12,720 cal BP), a behavior that could be due to a delayed response of the Southern Hemisphere.

Keywords

14C calibrationABAcellulose extractioninterhemispheric 14C gradientSIRI 2013subfossil woodYounger Dryas event

Information

Type
Research Article
Information
Radiocarbon , Volume 60 , Issue 1 , February 2018 , pp. 51 - 74
Copyright
© 2017 by the Arizona Board of Regents on behalf of the University of Arizona 

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