The KNW rutile—a natural reference material for microbeam U–Pb age and trace element determination†

IF 3.1 2区 化学 Q2 CHEMISTRY, ANALYTICAL
Jia Meng, Shitou Wu, Hao Wang, Yueheng Yang, Chao Huang, Chao Zhang, Wenqiang Yang, Jiarun Tu, Shuiyuan Yang, Qian Ma, Qian Wang, Lei Xu and Liewen Xie
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引用次数: 0

Abstract

Rutile is an accessory mineral that is widely distributed in magmatic, metamorphic, and sedimentary rocks. Thus, rutile U–Pb geochronology and geochemistry (e.g., Zr-in-rutile thermometry) can provide important information on the geological evolution of a region. Accurate and precise in situ U–Pb dating and trace element content measurement require well-characterized reference materials to correct matrix-dependent elemental fractionation. We present a natural rutile reference material (the KNW rutile) for microbeam U–Pb age and trace element determination. The KNW rutile was collected from a pegmatite in Kragerø, Norway, which is ∼20 km east of the location where the R10 rutile was sampled. It is ∼21 mm × 10 mm × 8 mm in size, with a total mass of ∼30 g. The KNW rutile has a homogeneous U–Pb age, as shown by numerous LA-ICP-MS spot analyses (weighted mean 206Pb/238U age = 1089.5 ± 3.3 Ma; MSWD = 2.7; n = 229). KNW rutile contains very little common Pb with only 12 of 241 spot analyses showing an amount of common Pb (f206: 0–20%). Seven ID-TIMS analyses produced a concordia age of 1088.2 ± 1.5 Ma (MSWD = 0.63) and a weighted mean 206Pb/238U age of 1088.2 ± 1.9 Ma (MSWD = 0.19), which is our recommended U–Pb age. The degree of homogeneous distributions of eleven trace elements was evaluated using LA-ICP-MS and EPMA. V, Cr, Nb, Sc, Zr, and Hf are sufficiently homogeneously distributed, whereas Ta, U, Pb, Fe, and W are heterogeneous. The determination of reference values for Zr and other trace elements as well as their uncertainties at the 95% confidence level followed International Organization for Standardization (ISO) guidelines and the certification protocol of the International Association of Geoanalysts (IAG) closely. The KNW rutile has a Zr content of 1183 ± 198 μg g−1 (95% confidence level). The KNW rutile is a useful addition to the reference materials previously distributed for microbeam U–Pb age and trace element determination.

Abstract Image

Abstract Image

KNW 金红石--用于微束 U-Pb 年龄和痕量元素测定的天然参考材料
金红石是一种附属矿物,广泛分布于岩浆岩、变质岩和沉积岩中。因此,金红石的 U-Pb 地球年代学和地球化学(如金红石中的锌热量测定法)可以提供有关一个地区地质演变的重要信息。准确和精确的原位 U-Pb 测年和痕量元素含量测量需要特性良好的参照材料,以校正基质相关的元素分馏。我们介绍了一种用于微束 U-Pb 年龄和痕量元素测定的天然金红石参照材料(KNW 金红石)。KNW 金红石是从挪威克拉格罗的一个伟晶岩中采集的,该伟晶岩位于 R10 金红石采样地点以东 20 千米。大量的 LA-ICP-MS 点分析表明,KNW 金红石具有均匀的 U-Pb 年龄(加权平均 206Pb/238U 年龄 = 1089.5 ± 3.3 Ma;MSWD = 2.7;n = 229)。KNW 金红石中的普通铅含量极低,241 项点分析中只有 12 项显示出一定量的普通铅(f206:0-20%)。七项 ID-TIMS 分析得出的一致年龄为 1088.2 ± 1.5 Ma(MSWD = 0.63),加权平均 206Pb/238U 年龄为 1088.2 ± 1.9 Ma(MSWD = 0.19),这是我们推荐的 U-Pb 年龄。利用 LA-ICP-MS 和 EPMA 评估了 11 种微量元素的均匀分布程度。V、Cr、Nb、Sc、Zr 和 Hf 的分布足够均匀,而 Ta、U、Pb、Fe 和 W 的分布则不均匀。Zr 和其他微量元素参考值及其 95% 置信度的不确定性的确定严格遵循国际标准化组织 (ISO) 的指导方针和国际地质分析师协会 (IAG) 的认证协议。KNW 金红石的锆含量为 1183 ± 198 μg g-1(95% 置信度)。KNW 金红石是对以前分发的微束 U-Pb 年龄和微量元素测定参考材料的有益补充。
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来源期刊
CiteScore
6.20
自引率
26.50%
发文量
228
审稿时长
1.7 months
期刊介绍: Innovative research on the fundamental theory and application of spectrometric techniques.
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