Abstract Four lime mortar samples from the Mérida amphitheatre in Spain were dated in 2001 and re-dated in 2019 with refined dating methods and focus on carbon dioxide that was released in late CO2 fractions when dissolved in phosphoric acid. The samples were difficult to date because they contained highly soluble, young carbonate contamination that dominated the carbon dioxide from the early stages of the reaction with the acid in the hydrolysis process. They were also rather hydraulic and rich in magnesium, which could have caused delayed hardening. However, there was very little dead carbon contamination so that late carbon dioxide fraction gave uniform 14C ages, pointing to a late 1st c. AD Flavian, or later age of the amphitheatre.

中文翻译：

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西班牙梅里达的罗马圆形剧场 ˗Augustan 还是 Flavian？砂浆碳酸盐的放射性碳测年结果

摘要 来自西班牙梅里达圆形剧场的四份石灰砂浆样品于 2001 年测年，并于 2019 年通过改进的测年方法重新测年，重点关注溶解在磷酸中的晚期 CO2 部分中释放的二氧化碳。样品很难确定日期，因为它们含有高度可溶的年轻碳酸盐污染物，在水解过程中与酸反应的早期阶段，这些污染物在二氧化碳中占主导地位。它们也相当水硬，富含镁，这可能会导致延迟硬化。然而，几乎没有死碳污染，因此晚期二氧化碳部分给出了统一的 14C 年龄，指向 1 世纪晚期。AD Flavian，或圆形剧场的晚期时代。