Apatite Fission-Track Dating: A Comparative Study of Ages Obtained by the Automated Counting LA-ICP-MS and External Detector Methodologies

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2024-07-16 DOI:10.2113/2023/lithosphere_2023_260

R. Lugo-Zazueta, A. Gleadow, Barry P. Kohn, H. Sahu, Mauricio A. Bermúdez

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引用次数: 0

Abstract

Laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) in combination with developments in digital microscopy, image analysis, and computer software has allowed the implementation of an automated counting approach for the apatite fission-track (AFT) analysis. We refer to this approach as the “automated counting-LA-ICP-MS” (ACLA) method. Two major components comprise the ACLA method: (i) the digital counting of spontaneous tracks performed on high-resolution images captured from apatite grains and (ii) the measurement of 238U content in apatite by LA-ICP-MS. This study includes ACLA analyses from Fish Canyon Tuff (FCT) and Durango apatite standard crystals. Furthermore, a comparative age study between the ACLA and conventional external detector method (EDM) strategies was performed on a set of thirteen granitoid samples from northwestern Mexico and four granitic samples from the eastern Dharwar craton (EDC), India. ACLA analyses on FCT yielded an AFT age of 28.1 ± 0.6 (1σ) and 28.8 ± 1.1 (1σ) Ma for Durango apatite, whereas reported EDM ages are 27.5 ± 0.5 and 31.4 ± 0.5 Ma, respectively. Calculated AFT ages using the ACLA method from northwestern Mexico samples range from 11.1 ± 1.1 to 42.0 ± 3.6 Ma (EDM ages range from 10.0 ± 0.8 to 54.0 ± 3.0 Ma), whereas AFT ages from the EDC samples range from 147 ± 3.1 to 220.5 ± 12.5 Ma (EDM ages range from 120.9 ± 4.5 to 197.1 ± 19.4 Ma). Based on a statistical comparison with ages previously determined by the conventional EDM on the same samples and considering their 2σ uncertainties, these ages are in good agreement.

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磷灰石裂变轨道定年：自动计数 LA-ICP-MS 和外部探测器方法获得的年龄比较研究

激光烧蚀电感耦合等离子体质谱法（LA-ICP-MS）与数字显微镜、图像分析和计算机软件的发展相结合，实现了磷灰石裂变轨迹（AFT）分析的自动计数方法。我们将这种方法称为 "自动计数-LA-ICP-MS"（ACLA）方法。ACLA 方法由两个主要部分组成：(i) 在从磷灰石晶粒捕获的高分辨率图像上对自发轨道进行数字计数；(ii) 通过 LA-ICP-MS 测量磷灰石中的 238U 含量。这项研究包括对鱼峡谷凝灰岩（FCT）和杜兰戈磷灰石标准晶体的 ACLA 分析。此外，还对来自墨西哥西北部的 13 个花岗岩样本和来自印度东部达尔沃克拉顿（EDC）的 4 个花岗岩样本进行了 ACLA 与传统外部探测器方法（EDM）之间的年龄对比研究。对 FCT 的 ACLA 分析得出杜兰戈磷灰石的 AFT 年龄为 28.1 ± 0.6 (1σ) Ma 和 28.8 ± 1.1 (1σ) Ma，而报告的 EDM 年龄分别为 27.5 ± 0.5 Ma 和 31.4 ± 0.5 Ma。墨西哥西北部样本采用 ACLA 方法计算的 AFT 年龄为 11.1 ± 1.1 至 42.0 ± 3.6 Ma（EDM 年龄为 10.0 ± 0.8 至 54.0 ± 3.0 Ma），而 EDC 样本的 AFT 年龄为 147 ± 3.1 至 220.5 ± 12.5 Ma（EDM 年龄为 120.9 ± 4.5 至 197.1 ± 19.4 Ma）。根据与之前在相同样品上通过传统 EDM 方法测定的年龄进行的统计比较，并考虑到其 2σ 不确定性，这些年龄具有很好的一致性。

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.