Mortar Radiocarbon Dating: Preliminary Accuracy Evaluation of a Novel Methodology

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• 作者：Fabio Marzaioli ; Carmine Lubritto ; Sara Nonni ; Isabella Passariello ; Manuela Capano ; Filippo Terrasi
• 刊名：Analytical Chemistry
• 出版年：2011
• 出版时间：March 15, 2011
• 年：2011
• 卷：83
• 期：6
• 页码：2038-2045
• 全文大小：933K
• 年卷期：v.83,no.6(March 15, 2011)
• ISSN：1520-6882

文摘

Mortars represent a class of building and art materials that are widespread at archeological sites from the Neolithic period on. After about 50 years of experimentation, the possibility to evaluate their absolute chronology by means of radiocarbon (¹⁴C) remains still uncertain. With the use of a simplified mortar production process in the laboratory environment, this study shows the overall feasibility of a novel physical pretreatment for the isolation of the atmospheric ¹⁴CO₂ (i.e., binder) signal absorbed by the mortars during their setting. This methodology is based on the assumption that an ultrasonic attack in liquid phase isolates a suspension of binder carbonates from bulk mortars. Isotopic (¹³C and ¹⁴C), % C, X-ray diffractometry (XRD), and scanning electron microscopy (SEM) analyses were performed to characterize the proposed methodology. The applied protocol allows suppression of the fossil carbon (C) contamination originating from the incomplete burning of the limestone during the quick lime production, providing unbiased dating for 鈥渓aboratory鈥?mortars produced operating at historically adopted burning temperatures.