ASSESSMENT OF RESIDUAL GEOGENIC CARBON IN MORTARS CONCERNING RADIOCARBON DATING

IF 2 3区 地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS
Radiocarbon Pub Date : 2023-12-12 DOI:10.1017/rdc.2023.81
Jan Válek, Petr Kozlovcev, Anna Fialová, Kristýna Kotková, Dita Frankeová, Ivo Světlík, Kateřina Pachnerová Brabcová
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Abstract

Quicklime samples were collected from six vertical layers (L1–L6) of a feedstock calcined in a traditional single-batch wood-fired kiln and assessed. Three samples were well-burned and three under-burned. The quicklime was slaked in an excess of water and the presence of unburned particles was investigated after settling it into putty. The putty was assessed as bulk and also at three depth levels. Thermal analysis determined the CO2 residua in the quicklime samples. Cathodoluminescence detected individual unburned particles and image analysis was used for their quantification. Settling of the putties led to a considerable reduction of geogenic particles in the layers above the bottom. This was also confirmed by the stable isotope analysis. In the case of the putties made from well-burned quicklime, the δ13C values of samples L4 and L5 ranged from –25.5‰ to –20.5‰ VPDB, and the δ18O values ranged from –17.5‰ to –16.5‰ VPDB. The fractionation was likely affected by the division according to the particle size during the sedimentation. The results of the 14C analysis correlate with the quantified percentage of cathodoluminescent particles.

有关放射性碳年代测定的灰泥中残留地质碳的评估
从传统单批柴烧窑中煅烧的原料的六个垂直层(L1-L6)收集生石灰样品并进行评估。其中三个样品焙烧良好,三个焙烧不足。生石灰用过量的水浸泡,沉淀成腻子后调查未燃烧颗粒的存在情况。对腻子进行了散装和三个深度层次的评估。热分析确定了生石灰样品中的二氧化碳残留物。阴极荧光法可检测出单个未燃烧颗粒,并通过图像分析对其进行量化。腻子的沉降导致底部以上各层的地质颗粒大量减少。稳定同位素分析也证实了这一点。在由焙烧良好的生石灰制成的腻子中,样品 L4 和 L5 的 δ13C 值介于-25.5‰至-20.5‰ VPDB 之间,δ18O 值介于-17.5‰至-16.5‰ VPDB 之间。分馏可能受到沉积过程中按粒度划分的影响。14C 分析结果与阴极发光颗粒的量化百分比相关。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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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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