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Carbonate 14C Background: Does It Have Multiple Personalities?

Published online by Cambridge University Press:  18 July 2016

Marie-Josée Nadeau ,
Pieter M Grootes ,
Antje Voelker ,
Frank Bruhn ,
Alexander Duhr  and
Angelika Oriwall
Marie-Josée Nadeau*
Affiliation:
Leibniz Labor, Christian-Albrechts University, Max-Eyth Strasse 11-13, 24118 Kiel, Germany
Pieter M Grootes
Affiliation:
Leibniz Labor, Christian-Albrechts University, Max-Eyth Strasse 11-13, 24118 Kiel, Germany
Antje Voelker
Affiliation:
Leibniz Labor, Christian-Albrechts University, Max-Eyth Strasse 11-13, 24118 Kiel, Germany
Frank Bruhn
Affiliation:
Leibniz Labor, Christian-Albrechts University, Max-Eyth Strasse 11-13, 24118 Kiel, Germany
Alexander Duhr
Affiliation:
Leibniz Labor, Christian-Albrechts University, Max-Eyth Strasse 11-13, 24118 Kiel, Germany
Angelika Oriwall
Affiliation:
Leibniz Labor, Christian-Albrechts University, Max-Eyth Strasse 11-13, 24118 Kiel, Germany
*
Corresponding author. Email: [email protected]
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Abstract

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Measurements of the radiocarbon concentration of several carbonate background materials, either mineral (IAEA C1 Carrara marble and Icelandic double spar) or biogenic (foraminifera and molluscs), show that the apparent ages of diverse materials can be quite different. Using 0.07 pMC obtained from mineral samples as a processing blank, the results from foraminifera and mollusc background samples, varying from 0.12 to 0.58 pMC (54.0-41.4 ka), show a species-specific contamination that reproduces over several individual shells and foraminifera from several sediment cores. Different cleaning attempts have proven ineffective, and even stronger measures such as progressive hydrolization or leaching of the samples prior to routine preparation, did not give any indication of the source of the contamination. In light of these results, the use of mineral background material in the evaluation of the age of older unknown samples of biogenic carbonate (>30 ka) proves inadequate. The use of background samples of the same species and provenance as the unknown samples is essential, and if such material is unavailable, generic biogenic samples such as mixed foraminifera samples should be used. The description of our new modular carbonate sample preparation system is also introduced.

Type
I. Becoming Better
Information
Radiocarbon , Volume 43 , Issue 2A: Proceedings of the 17th International Radiocarbon Conference (Part 1 of 3) , 2001 , pp. 169 - 176
Copyright
Copyright © The Arizona Board of Regents on behalf of the University of Arizona 

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