In situ determination of hafnium isotopes from rutile using LA-MC-ICP-MS
In situ determination of hafnium isotopes from rutile using LA-MC-ICP-MS
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使用 LA-MC-ICP-MS 原位测定金红石中的铪同位素
DOI：
10.1007/s11430-015-5215-2
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发表时间：
2015
期刊：
影响因子：
--
通讯作者：
Huang Chao
中科院分区：
文献类型：
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作者：
Li Yang;Yang YueHeng;Jiao ShuJuan;Wu FuYuan;Yang JinHui;Xie LieWen;Huang Chao
激光烧蚀铪同位素分析已广泛应用于富铪矿物（锆石/斜锆石/钙钛矿/真透辉石），而贫铪矿物（100 ppm）的研究报道较少。介绍了一种激光烧蚀多接收电感耦合等离子体质谱（LA-MC-ICP-MS）原位分析金红石中铪同位素的方法。金红石U-Pb定年标准物质JDX显示出均匀的铪同位素比值，其176 Hf/177 Hf =0.281795±0.000015（2SD，n=33）和176 Lu/177 Hf =0.000018± 0.00004（2SD，n=17），表明JDX有可能作为一种新的铪同位素测量标准物质。我们还测量了其他金红石U-Pb定年标准物质（R10，Sugluk-4和PCA-S207）的铪同位素组成，其176 Hf/177 Hf值与以前报道的结果相似，这证实了我们开发的分析方法可以获得准确和精确的铪同位素组成。通过对华北孔兹岩带不同地体高温和超高温麻粒岩的铪同位素组成和金红石U-Pb年龄的分析，结合同一地区的锆石结果，认为该麻粒岩的变质演化历史比以往认为的要复杂得多。
The hafnium isotopic analysis using laser ablation has been widely conducted on Hf-rich minerals (zircon/baddeleyite/calzirtite/eudialyte), however, little work has been reported on Hf-poor (<100 ppm) minerals. This work presents a detailed procedure of in situ hafnium isotopic analysis from rutile using laser ablation multiple collector inductively coupled plasma mass spectrometry (LA-MC-ICP-MS). The rutile U-Pb dating reference material JDX shows homogeneous hafnium isotopic ratios, with 176Hf/177Hf=0.281795±0.000015 (2SD, n=33) and 176Lu/177Hf=0.000018±0.000004 (2SD, n=17) that suggest the possibility of using JDX as a new reference material hafnium isotopic measurement. We also measure hafnium isotopic compositions of other rutile U-Pb dating reference material (R10, Sugluk-4 and PCA-S207) and the 176Hf/177Hf values are similar to previously reported results, which confirms that we can acquire accurate and precise hafnium isotopic compositions using our developed analytical protocol. We analyzed hafnium isotopic compositions and U-Pb ages of rutile in high-temperature and ultrahigh-temperature granulites from various terrains of the Khondalite Belt from the North China Craton, combined with zircon results in the same area, suggesting that the metamorphic evolution history of the granulite is much more complicated than previously thought.