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COMPARING DIRECT CARBONATE AND STANDARD GRAPHITE 14C DETERMINATIONS OF BIOGENIC CARBONATES
Radiocarbon ( IF 8.3 ) Pub Date : 2021-01-19 , DOI: 10.1017/rdc.2020.131 Jordon Bright , Chris Ebert , Matthew A Kosnik , John R Southon , Katherine Whitacre , Paolo G Albano , Carola Flores , Thomas K Frazer , Quan Hua , Michal Kowalewski , Julieta C Martinelli , David Oakley , Wesley G Parker , Michael Retelle , Matias do Nascimento Ritter , Marcelo M Rivadeneira , Daniele Scarponi , Yurena Yanes , Martin Zuschin , Darrell S Kaufman
Radiocarbon ( IF 8.3 ) Pub Date : 2021-01-19 , DOI: 10.1017/rdc.2020.131 Jordon Bright , Chris Ebert , Matthew A Kosnik , John R Southon , Katherine Whitacre , Paolo G Albano , Carola Flores , Thomas K Frazer , Quan Hua , Michal Kowalewski , Julieta C Martinelli , David Oakley , Wesley G Parker , Michael Retelle , Matias do Nascimento Ritter , Marcelo M Rivadeneira , Daniele Scarponi , Yurena Yanes , Martin Zuschin , Darrell S Kaufman
The direct carbonate procedure for accelerator mass spectrometry radiocarbon (AMS 14 C) dating of submilligram samples of biogenic carbonate without graphitization is becoming widely used in a variety of studies. We compare the results of 153 paired direct carbonate and standard graphite 14 C determinations on single specimens of an assortment of biogenic carbonates. A reduced major axis regression shows a strong relationship between direct carbonate and graphite percent Modern Carbon (pMC) values (m = 0.996; 95% CI [0.991–1.001]). An analysis of differences and a 95% confidence interval on pMC values reveals that there is no significant difference between direct carbonate and graphite pMC values for 76% of analyzed specimens, although variation in direct carbonate pMC is underestimated. The difference between the two methods is typically within 2 pMC, with 61% of direct carbonate pMC measurements being higher than their paired graphite counterpart. Of the 36 specimens that did yield significant differences, all but three missed the 95% significance threshold by 1.2 pMC or less. These results show that direct carbonate 14 C dating of biogenic carbonates is a cost-effective and efficient complement to standard graphite 14 C dating.
中文翻译:
比较直接碳酸盐和标准石墨 14C 对生物碳酸盐的测定
加速器质谱放射性碳(AMS)的直接碳酸盐程序14 C) 未经石墨化的亚毫克生物碳酸盐样品的测年正广泛用于各种研究。我们比较了 153 对直接碳酸盐和标准石墨的结果14 对各种生物碳酸盐的单个样品进行 C 测定。简化的长轴回归显示直接碳酸盐和石墨百分比现代碳 (pMC) 值之间有很强的关系(m = 0.996;95% CI [0.991–1.001])。对 pMC 值的差异和 95% 置信区间的分析表明,对于 76% 的分析样品,直接碳酸盐和石墨 pMC 值之间没有显着差异,尽管直接碳酸盐 pMC 的变化被低估了。这两种方法之间的差异通常在 2 pMC 之内,其中 61% 的直接碳酸盐 pMC 测量值高于其配对石墨对应物。在确实产生显着差异的 36 个样本中,除 3 个样本外,其余样本均以 1.2 pMC 或更少的幅度错过了 95% 的显着性阈值。这些结果表明,直接碳酸盐14 生物成因碳酸盐的 C 测年是对标准石墨的经济高效的补充14 C约会。
更新日期:2021-01-19
中文翻译:
比较直接碳酸盐和标准石墨 14C 对生物碳酸盐的测定
加速器质谱放射性碳(AMS)的直接碳酸盐程序