At archaeological sites located on islands or near the coast, the potential exists for lipid extracts of potsherds to contain fatty acids (FA) from both aquatic and terrestrial organisms, meaning that consideration must be given to marine reservoir effects (MRE) in radiocarbon (14C) analyses. Here we studied the site of Bornais (Outer Hebrides, UK) where a local MRE, ΔR of –65 ± 45 yr was determined through the paired 14C determinations of terrestrial and marine faunal bones. Lipid analysis of 49 potsherds, revealed aquatic biomarkers in 45% of the vessels, and δ13C values of C16:0 and C18:0 FAs revealed ruminant and marine product mixing for 71% of the vessels. Compound-specific 14C analysis (CSRA) of FAs yielded intermediate 14C ages between those of terrestrial and marine bones from the same contexts, confirming an MRE existed. A database containing δ13C values for FAs from reference terrestrial and marine organisms provided endmembers for calculating the percentage marine-derived C (%marine) in FAs. We show that lipid 14C dates can be corrected using determined %marine and ΔR values, such that pottery vessels from coastal locations can be 14C dated by CSRA of FAs.

中文翻译：

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保存在考古陶器中的混合海洋/陆地脂质的化合物特异性放射性碳、稳定碳同位素和生物标志物分析

在位于岛屿或海岸附近的考古遗址，陶片的脂质提取物可能含有来自水生和陆生生物的脂肪酸（FA），这意味着必须考虑放射性碳中的海洋储层效应（MRE）。14C) 分析。在这里，我们研究了 Bornais（英国外赫布里底群岛）的地点，通过配对确定当地 MRE，ΔR 为 –65 ± 45 yr14C 陆地和海洋动物骨骼的测定。对 49 个陶片进行脂质分析，发现 45% 的容器中有水生生物标志物，而 δ13C 的 C 值16:0和 C18:0FAs 显示 71% 的船只有反刍动物和海产品混合。化合物特异性14FA 的 C 分析 (CSRA) 产生中间体14来自相同环境的陆地和海洋骨骼之间的 C 年龄，证实了 MRE 的存在。包含 δ 的数据库13来自参考陆地和海洋生物的 FA 的 C 值提供了计算海洋衍生 C 百分比的端元（%海洋) 在 FA 中。我们证明了脂质14C 日期可以使用确定的更正%海洋和 ΔR 值，这样沿海地区的陶器可以14C 由 FA 的 CSRA 注明日期。