泄漏的天文钟:与 CA-TIMS 相比,激光烧蚀锆石 U-Pb 测定中系统性隐性铅损失的证据

IF 2.2 3区 地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY
Terra Nova Pub Date : 2024-08-06 DOI:10.1111/ter.12742
Benjamin L. Howard, Glenn R. Sharman, James L. Crowley, Ellen Reat Wersan
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引用次数: 0

摘要

通过激光烧蚀-电感耦合等离子体质谱法(LA-ICP-MS)对锆石进行铀-铅定年,已成为确定结晶岩年龄以及(元)沉积岩产地和最大沉积年龄的主要方法。虽然化学研磨已成为减轻通过高分辨率热电离质谱(CA-TIMS)测定年代的锆石中铅损失的标准方法,但激光烧蚀测定年代很少伴有化学研磨。我们通过分析来自相同锆石晶体的大型配对分析数据库,评估了通过 LA-ICP-MS 获得的 U-Pb 日期相对于 CA-TIMS 的准确性。我们发现,激光烧蚀法获得的 206Pb/238U 日期比 CA-TIMS 法获得的日期要年轻,碎屑锆石(-2.0%)比火成岩或变质岩锆石(-0.9%)的偏移更大。尽管与 "基质效应 "有关的系统性偏差可能是一个促成因素,但我们的分析表明,在激光烧蚀 U-Pb 数据集中,未减轻的隐性铅损失可能很普遍。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
The leaky chronometer: Evidence for systematic cryptic Pb loss in laser ablation U‐Pb dating of zircon relative to CA‐TIMS
U–Pb dating of zircon via laser ablation‐inductively coupled plasma‐mass spectrometry (LA‐ICP‐MS) has become a primary method for determining the age of crystalline rocks and the provenance and maximum depositional age of (meta)sedimentary rocks. Although chemical abrasion has become a standard approach for mitigating Pb loss in zircon dated via high‐resolution thermal ionization mass spectrometry (CA‐TIMS), laser ablation dating is rarely accompanied by chemical abrasion. We evaluate the accuracy of U–Pb dates acquired via LA‐ICP‐MS relative to CA‐TIMS through analysis of a large database of paired analyses from the same zircon crystals. We show that laser ablation 206Pb/238U dates are systematically younger than their CA‐TIMS counterparts, with a greater shift in detrital zircon (−2.0%) versus igneous or metamorphic zircon (−0.9%). Although systematic biases related to “matrix effects” may be a contributing factor, our analysis suggests that unmitigated cryptic Pb loss is likely widespread in laser ablation U–Pb datasets.
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来源期刊
Terra Nova
Terra Nova 地学-地球科学综合
CiteScore
4.80
自引率
8.30%
发文量
59
审稿时长
2.3 months
期刊介绍: Terra Nova publishes short, innovative and provocative papers of interest to a wide readership and covering the broadest spectrum of the Solid Earth and Planetary Sciences. Terra Nova encompasses geology, geophysics and geochemistry, and extends to the fluid envelopes (atmosphere, ocean, environment) whenever coupling with the Solid Earth is involved.
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