Lu–Hf isotopic systematics is a powerful tool and gained importance as a geochemical tracer in geosciences. A multi‐collector inductively coupled plasma mass spectrometer coupled with a laser ablation system has been used to perform zircon hafnium (Hf) isotopic analysis, and protocol is established for measurement of Hf isotopes. Toward this, two zircon standards, Z91500 and Plesovice, have been used for Hf isotopic measurements at four different spot sizes (50, 40, 25, and 20 μm). The isotopic data for ≥25 μm have an excellent agreement with published data, but for 20 μm, the results are erroneous and irrelevant to geological application. It has been observed that Hf beam intensity has a linear relation to the volume of the target (RM) ablated. ¹⁷⁸Hf/¹⁷⁷Hf ratio and ɛHf for both standards are comparable with the published recommended values. The present study indicates that ¹⁷⁶Lu/¹⁷⁷Hf ratio for Z91500 is more homogeneous than Plesovice zircon. The ¹⁷⁶Hf/¹⁷⁷Hf isotopic ratio for 50 and 25 μm shows an excellent agreement with the previously reported data. However, for 40‐μm spot size, a slightly higher but negative offset of −123 and −105 ppm in ¹⁷⁶Hf/¹⁷⁷Hf ratio have been observed for Plesovice and 91500, respectively.

中文翻译：

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通过LA‐MC‐ICPMS在锆石标准液中以可变空间分辨率进行原位Hf同位素测量的分析品质因数的变化

Lu-Hf同位素系统学是一种功能强大的工具，在地球科学中作为地球化学示踪剂已变得越来越重要。多收集器电感耦合等离子体质谱仪结合激光烧蚀系统已用于进行锆con（Hf）同位素分析，并建立了用于测量Hf同位素的方案。为此，两个锆石标准品Z91500和Plesovice已用于四种不同光斑尺寸（50、40、25和20μm）的Hf同位素测量。≥25μm的同位素数据与已发表的数据有很好的一致性，但是对于20μm的同位素数据是错误的，与地质应用无关。已经观察到，Hf光束强度与被烧蚀的目标（RM）的体积具有线性关系。^178高/ ¹⁷⁷两种标准的Hf比和ɛHf与公布的推荐值相当。本研究表明，Z91500的¹⁷⁶ Lu / ¹⁷⁷ Hf比比Plesovice锆石更均匀。50和25μm的¹⁷⁶ Hf / ¹⁷⁷ Hf同位素比与先前报道的数据非常吻合。但是，对于40μm的光斑尺寸，Plesovice和91500分别观察到在¹⁷⁶ Hf / ¹⁷⁷ Hf比中稍高但为负的-123和-105 ppm的负偏移。