DEVELOPMENT OF A 14C PROTOCOL AT THE LMC14 FOR THE DATING OF CULTURAL HERITAGE MATERIALS: HISTORICAL MORTARS. PARTICIPATION IN THE MODIS INTERNATIONAL INTERCOMPARISON CAMPAIGN

IF 2 3区地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS Radiocarbon Pub Date : 2024-01-11 DOI:10.1017/rdc.2023.118

Christophe Moreau, Jean-Pascal Dumoulin, Maguy Jaber, Ingrid Caffy, Emmanuelle Delqué-Količ, Cédric Goulas, Stéphane Hain, Marion Perron, Valérie Setti, Marc Sieudat, Bruno Thellier, Lucile Beck

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Abstract

The absolute dating of mortar by accelerator mass spectrometry (AMS) has been the subject of renewed interest for several years. International intercomparison campaigns, called MODIS (MOrtar Dating Intercomparison Study), have been carried out. The first MODIS-1 campaign highlighted limitations in mortar dating, due to the similarity between the primary material to be dated (binder) and the contaminant (exogenous CaCO3). Methods have since emerged to overcome this problem and the need for a good preliminary characterization has been proven. The Laboratoire de Mesure du Carbone 14 (LMC14) took part in the second intercomparison campaign, MODIS2, by applying thermal decomposition increments to distinguish the carbonated binder, the organic matter contaminants (late in formation pyrogenic carbonate, LDH) and limestone. The LMC14 results on MODIS2 are quite conclusive on “pure” re-carbonated lime mortar binders containing little contaminant geological limestone but show their weaknesses for mortars heavily contaminated in Dolomites, which are difficult to discern from the binder. Recommendations for users of radiocarbon (14C) dating on mortar-based materials are made in the conclusion.

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在 LMC14 制定一项 14C 规程，用于确定文化遗产材料的年代：历史性迫击炮。参与莫迪斯国际相互比较活动

近年来，利用加速器质谱法（AMS）对灰泥进行绝对定年重新引起了人们的兴趣。开展了名为 MODIS（灰泥定年相互比较研究）的国际相互比较活动。第一次 MODIS-1 活动突出了灰泥定年的局限性，这是因为要定年的主要材料（粘结剂）和污染物（外源 CaCO3）之间存在相似性。此后，出现了一些方法来克服这一问题，并证明需要进行良好的初步特征描述。碳14测量实验室（LMC14）参加了第二次比对活动 MODIS2，利用热分解增量来区分碳化粘合剂、有机物污染物（形成后期的热成碳酸盐，LDH）和石灰石。MODIS2 上的 LMC14 结果对 "纯 "再碳化石灰砂浆粘合剂（含少量污染地质石灰岩）非常有说服力，但对受到白云石严重污染的砂浆则显示出其弱点，很难将其与粘合剂区分开来。结论中对砂浆材料的放射性碳（14C）年代测定用户提出了建议。

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来源期刊

Radiocarbon 地学-地球化学与地球物理

CiteScore

16.20

自引率

6.00%

发文量

审稿时长

6-12 weeks

期刊介绍： Radiocarbon serves as the leading international journal for technical and interpretive articles, date lists, and advancements in 14C and other radioisotopes relevant to archaeological, geophysical, oceanographic, and related dating methods. Established in 1959, it has published numerous seminal works and hosts the triennial International Radiocarbon Conference proceedings. The journal also features occasional special issues. Submissions encompass regular articles such as research reports, technical descriptions, and date lists, along with comments, letters to the editor, book reviews, and laboratory lists.