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Cathodoluminescence and Laser-Induced Fluorescence of Calcium Carbonate: A Review of Screening Methods for Radiocarbon Dating of Ancient Lime Mortars

Published online by Cambridge University Press:  28 April 2020

Michael B Toffolo Open the ORCID record for Michael B Toffolo [Opens in a new window] ,
Giulia Ricci Open the ORCID record for Giulia Ricci [Opens in a new window] ,
Rémy Chapoulie ,
Luisa Caneve  and
Ifat Kaplan-Ashiri
Michael B Toffolo*
Affiliation:
Institut de Recherche sur les Archéomatériaux-Centre de Recherche en Physique Appliquée à l’Archéologie (IRAMAT-CRP2A), UMR 5060 CNRS, Université Bordeaux Montaigne, 8 Esplanade des Antilles, Pessac33607, France
Giulia Ricci*
Affiliation:
Dipartimento di Geoscienze, Università degli Studi di Padova, Via Giovanni Gradenigo 6, Padova35131, Italy
Rémy Chapoulie
Affiliation:
Institut de Recherche sur les Archéomatériaux-Centre de Recherche en Physique Appliquée à l’Archéologie (IRAMAT-CRP2A), UMR 5060 CNRS, Université Bordeaux Montaigne, 8 Esplanade des Antilles, Pessac33607, France
Luisa Caneve
Affiliation:
ENEA, Technical Unit for the Development of Applications of Radiations, CR Frascati, Via Enrico Fermi 45, Frascati00044, Italy
Ifat Kaplan-Ashiri
Affiliation:
Department of Chemical Research Support, Weizmann Institute of Science, 234 Herzl Street, Rehovot7610001, Israel
*
*Corresponding authors. Michael Toffolo and Giulia Ricci contributed equally to this work. Email: [email protected]; [email protected].
*Corresponding authors. Michael Toffolo and Giulia Ricci contributed equally to this work. Email: [email protected]; [email protected].
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Abstract

Accurate radiocarbon (14C) dating of lime mortars requires a thorough mineralogical characterization of binders in order to verify the presence of carbon-bearing contaminants. In the last 20 years, cathodoluminescence (CL) has been widely used for the identification of geologic calcium carbonate (CaCO3) aggregates and unreacted lime lumps within the particle size fraction selected for carbon recovery. These components are major sources of older and younger carbon, respectively, and should be removed to obtain accurate age determinations. More recently, laser-induced fluorescence (LIF) has provided another means of investigating the preservation state and composition of CaCO3 binders. Considered the growing interest of the mortar dating community in the latest advancements of these analytical methods, here we review the principles of CL and LIF of CaCO3, their instrument setup, and their application to the characterization of ancient lime mortars used for 14C dating. In addition, we provide examples of SEM-CL and LIF analyses using high-resolution instrumentation, we discuss current issues and propose future lines of research.

Keywords

calcium carbonatecathodoluminescencefluorescencemortarplaster
Type
Research Article
Information
Radiocarbon , Volume 62 , Issue 3: MoDIM 2018 Proceedings of the Mortar Dating International Meeting , June 2020 , pp. 545 - 564
Copyright
© 2020 by the Arizona Board of Regents on behalf of the University of Arizona

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Footnotes

Selected Papers from the Mortar Dating International Meeting, Pessac, France, 25–27 Oct. 2018

References

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