碳酸盐样品中CO2的同位素重置:对氧和团块同位素分析的影响

IF 3.6 2区 地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS
Philip Staudigel , Miguel Bernecker , Allison Curley , Niels Meijer , Lkhamsuren Bayarjargal , Martin Dietzel , Jens Fiebig
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引用次数: 0

摘要

CO2和含水相之间的交换是碳酸盐衍生CO2的氧和团块同位素分析中始终存在的问题。在这里,我们已经确定了许多天然和合成碳酸盐以及含碳酸盐的材料,这些材料在普通酸浴酸化过程中始终重置分析物CO2的δ18O,∆47和∆48值,从而导致制备噪声。从质量平衡的角度来看,这类似于二氧化碳和一种小的水污染物之间的同位素交换:这表明某些样品即使在真空干燥器中待了几个月也不能有效干燥。这种效果可以在离线实验中复制,允许在不危及日常实验室操作的情况下明确识别有问题的样品。我们进一步描述了实验室最佳实践,其中这种影响的风险被有效地最小化,允许快速识别有问题的样品:例如,在分析序列之前使用极低∆47值的碳酸盐标准(例如ETH-1和ETH-2),可以快速识别这些问题。这突出了分析碳酸盐和平衡二氧化碳标准材料的重要性,因为这些影响不容易被识别和消除。我们提出这一报告的目的是希望它能帮助其他实验室提高数据质量,并开始讨论使用“外来”块状和团块同位素组成的额外碳酸盐标准的潜在必要性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Isotopic resetting of CO2 in the presence of carbonate samples: Implications for oxygen- and clumped-isotope analyses
Exchange between CO2 and water-containing phases is a consistent problem during oxygen and clumped isotope analysis of carbonate-derived CO2. Here, we have identified numerous natural and synthetic carbonates and carbonate-bearing materials that consistently reset the δ18O, ∆47 and ∆48 values of analyte CO2 during acidification in a common acid bath and, thereby, contribute to preparation noise. From a mass-balance perspective, this resembles the isotopic exchange between CO2 and a small water contaminant: indicating that certain samples cannot be effectively dried, even after several months in a vacuum drier. This effect can be replicated in off-line experiments, allowing for problematic samples to be unambiguously identified without endangering day-to-day lab operations. We further describe laboratory best-practices wherein the risk of this effect is effectively minimized, allowing for rapid identification of problematic samples: for example, the use of carbonate standards with extremely low ∆47 values (e.g. ETH-1 and ETH-2) before an analytical sequence allows such issues to be rapidly identified. This highlights the importance of analyzing both carbonate and equilibrated CO2 standard materials, as these effects could not otherwise be easily identified and eliminated. We present this report in expectation that it will assist other laboratories to improve data quality, as well as to start a conversation about the potential necessity for additional carbonate standards with “exotic” bulk and clumped isotope compositions.
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来源期刊
Chemical Geology
Chemical Geology 地学-地球化学与地球物理
CiteScore
7.20
自引率
10.30%
发文量
374
审稿时长
3.6 months
期刊介绍: Chemical Geology is an international journal that publishes original research papers on isotopic and elemental geochemistry, geochronology and cosmochemistry. The Journal focuses on chemical processes in igneous, metamorphic, and sedimentary petrology, low- and high-temperature aqueous solutions, biogeochemistry, the environment and cosmochemistry. Papers that are field, experimentally, or computationally based are appropriate if they are of broad international interest. The Journal generally does not publish papers that are primarily of regional or local interest, or which are primarily focused on remediation and applied geochemistry. The Journal also welcomes innovative papers dealing with significant analytical advances that are of wide interest in the community and extend significantly beyond the scope of what would be included in the methods section of a standard research paper.
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