比较 MICADAS 气体源、直接碳酸盐和标准石墨对生物碳酸盐的 14C 测定结果

IF 2 3区 地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS
Radiocarbon Pub Date : 2024-04-29 DOI:10.1017/rdc.2024.45
Jordon Bright, Chris Ebert, Carola Flores, Paul G Harnik, John Warren Huntley, Michał Kowalewski, Roger W Portell, Michael Retelle, Edward A G Schuur, Darrell S Kaufman
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引用次数: 0

摘要

美国亚利桑那州弗拉格斯塔夫的北亚利桑那大学(Northern Arizona University)最近安装了带气体界面系统(GIS)的 MIni CArbon DAting 系统(MICADAS),用于测定生物碳酸盐酸溶解释放的二氧化碳气体中的 14C 含量。我们比较了 48 个配对石墨、GIS 和直接碳酸盐 14C 测定的软体动物贝壳和回声虫测试结果。GIS 样本大小介于 0.5 至 1.5 毫克之间,时间跨度为 0.1 至 45.1 ka BP(n = 42)。缩小的主轴回归显示,GIS 与石墨现代碳百分率(pMC)值之间的关系密切(m = 1.011;95% CI [0.997-1.023],R2 = 0.999),优于直接碳酸盐与石墨值之间的关系(m = 0.978;95% CI [0.959-0.999],R2 = 0.997)。60% 的 GIS pMC 值与石墨对应值的误差在 ±0.5 pMC 范围内,而直接碳酸盐 pMC 值的误差为 26%。GIS 分析的精度在 6.5 ka BP 时约为±70 14C 年,在 12.5 ka BP 时降至约±130 14C 年。这一精度与直接碳酸盐的精度相当,大约是石墨精度的五倍。6 个新近纪软体动物和回声类样本在分析为直接碳酸盐时得出了有限年龄,但在分析为石墨或 GIS 时却得出了非无限年龄。我们的研究结果表明,对生物碳酸盐进行 GIS 14C 测定要优于直接碳酸盐 14C 测定,当不需要石墨 14C 测定的精确性时,GIS 是标准石墨 14C 测定的有效替代方法。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Comparing MICADAS gas source, direct carbonate, and standard graphite 14C determinations of biogenic carbonate

Northern Arizona University, Flagstaff, Arizona, USA, recently installed a MIni CArbon DAting System (MICADAS) with a gas interface system (GIS) for determining the 14C content of CO2 gas released by the acid dissolution of biogenic carbonates. We compare 48 paired graphite, GIS, and direct carbonate 14C determinations of individual mollusk shells and echinoid tests. GIS sample sizes ranged between 0.5 and 1.5 mg and span 0.1 to 45.1 ka BP (n = 42). A reduced major axis regression shows a strong relationship between GIS and graphite percent Modern Carbon (pMC) values (m = 1.011; 95% CI [0.997–1.023], R2 = 0.999) that is superior to the relationship between the direct carbonate and graphite values (m = 0.978; 95% CI [0.959-0.999], R2 = 0.997). Sixty percent of GIS pMC values are within ±0.5 pMC of their graphite counterparts, compared to 26% of direct carbonate pMC values. The precision of GIS analyses is approximately ±70 14C yrs to 6.5 ka BP and decreases to approximately ±130 14C yrs at 12.5 ka BP. This precision is on par with direct carbonate and is approximately five times larger than for graphite. Six Plio-Pleistocene mollusk and echinoid samples yield finite ages when analyzed as direct carbonate but yield non-finite ages when analyzed as graphite or as GIS. Our results show that GIS 14C dating of biogenic carbonates is preferable to direct carbonate 14C dating and is an efficient alternative to standard graphite 14C dating when the precision of graphite 14C dating is not required.

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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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