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

IF 1.8 4区地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS

Lithosphere 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

Lithosphere GEOCHEMISTRY & GEOPHYSICS-GEOLOGY

CiteScore

3.80

自引率

16.70%

发文量

284

审稿时长

>12 weeks

期刊介绍： The open access journal will have an expanded scope covering research in all areas of earth, planetary, and environmental sciences, providing a unique publishing choice for authors in the geoscience community.