在 modis2 互比框架内确定和选择用于放射性碳年代测定的灰泥样本:两种比较程序

IF 2 3区 地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS Radiocarbon Pub Date : 2024-02-13 DOI:10.1017/rdc.2024.3
G Artioli, S Barone, M Fedi, A Galli, L Liccioli, M Martini, F Marzaioli, F Maspero, L Panzeri, I Passariello, G Ricci, M Secco, F Terrasi
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引用次数: 0

摘要

几十年来,人们一直在努力提高灰泥放射性碳年代测定法的准确性,并评估有关受检标本类型学结果的可靠性。在许多情况下,应用该方法的几个基本假设可能无法实现,例如:(a)煅烧过程中原生石灰岩完全解离,(b)钙质聚集体中所含的地质碳有效分离,(c)碳化时间短,以及(d)不存在次生方解石。世界各地的许多实验室都提出了不同的方法来选择合适的灰泥组分。2016 年组织了首次相互比较尝试,有 8 个国际实验室参与,旨在比较和统计处理不同实验室采用各自的表征和预处理方法对相同材料得出的结果(Hajdas 等人,2017 年;Hayen 等人,2017 年)。继第一步之后,2018 年在灰泥定年国际会议(法国波尔多)期间提出并建立了新的相互比较实验。我们选择了一组新的三个灰泥样本,并注意选择标准化材料(均质性、已知矿物成分、无外源夹杂物、已知预期年代)。这项工作介绍了参与相互比较的两个研究小组的成果。根据每个实验室的策略,对样品进行了特征描述、选择和年代测定。结果强调了原材料特征描述的重要性,以便更好地了解样品的矿物学和岩石学成分。这些信息可以帮助选择最合适的二氧化碳提取策略,进而帮助解释数据。
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CHARACTERIZATION AND SELECTION OF MORTAR SAMPLES FOR RADIOCARBON DATING IN THE FRAMEWORK OF THE MODIS2 INTERCOMPARISON: TWO COMPARED PROCEDURES
For several decades, many efforts have been dedicated to enhancing the accuracy of mortar radiocarbon dating and evaluating the reliability of the results concerning the typology of the examined specimens. Several assumptions that are fundamental for the application of the method may be in many cases not fulfilled, such as (a) complete primary limestone dissociation during calcination, (b) efficient separation of geogenic carbon contained in calcareous aggregates, (c) short carbonation time, and (d) absence of secondary calcite. Many laboratories all over the world have proposed different methods to select suitable fractions of mortar. The first intercomparison attempt, involving eight international laboratories, was organized in 2016 aiming at comparing and statistically treating the results obtained on the same materials by different laboratories with their own characterization and pre-treatment methods (Hajdas et al. 2017; Hayen et al. 2017). Following this first step, a new intercomparison experiment was proposed and set up in 2018 during the Mortar Dating International Meeting (Bordeaux, FR). A new set of three mortar samples was chosen, taking care of the selection of standardized materials (homogeneity, known mineralogical composition, absence of exogenous inclusions, known expected age). This work describes the results of two research teams involved in the intercomparison. The samples were characterized, selected, and dated depending on each laboratory strategy. The results stress the importance of the characterization of the raw material is to better understand the mineralogical and petrographical composition of the samples. Such information can support the choice of the most appropriate strategy for the extraction of CO2 and then for data interpretation.
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来源期刊
Radiocarbon
Radiocarbon 地学-地球化学与地球物理
CiteScore
16.20
自引率
6.00%
发文量
85
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.
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