Reported data for Lu, Hf mass fractions and ¹⁷⁶Hf/¹⁷⁷Hf isotopic ratios of mafic-ultramafic rock reference materials (RMs) are rare at present, hampering the comparison of data quality between difference laboratories. Herein, we measured the Lu and Hf mass fractions and the ¹⁷⁶Hf/¹⁷⁷Hf isotopic ratios of ten mafic-ultramafic rock RMs, including OKUM (komatiite), WPR-1 (serpentinised peridotite), NIM-N (norite), NIM-P (pyroxenite), UB-N (serpentinised peridotite), JP-1 (peridotite), NIM-D (dunite), MUH-1 (serpentinised harzburgite), HARZ01 (harzburgite), DTS-2b (dunite), which contain extremely low amounts of Lu and Hf (Lu, 2–150 ng g⁻¹; Hf, 5–500 ng g⁻¹). All measurements were conducted on a Neptune Plus multi-collector inductively coupled plasma-mass spectrometer employing an Aridus II desolvator inlet system and Jet sample/X skimmer cone configuration. The following RMs, OKUM, WPR-1, UB-N, JP-1, NIM-D, HARZ01 and DTS-2b, have ¹⁷⁶Hf/¹⁷⁷Hf precision of less than 60 ppm (2s) at test portions of 0.06 to 0.3 g, and are good ultramafic RMs for Lu-Hf systems. In contrast, significant Hf mass fraction and isotopic variability were observed in NIM-N, NIM-P and MUH-1 at test portion masses of 0.1 to 0.3 g. Collectively, our study provides a new database that can be used by the geochemical community for evaluating the Lu-Hf system of mafic-ultramafic rocks.

中文翻译：

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多收集器电感耦合等离子体质谱法测定镁铁质-超镁铁质岩石标准物质中 Lu 和 Hf 的质量分数和 176Hf/177Hf 比

目前镁铁质-超镁铁质岩石标准物质（RM）的Lu、Hf质量分数和¹⁷⁶ Hf/ ^{177 Hf同位素比的报道数据很少，阻碍了不同实验室之间数据质量的比较。}在此，我们测量了 10 种镁铁质-超镁铁质岩石 RM 的 Lu 和 Hf 质量分数以及¹⁷⁶ Hf/ ¹⁷⁷ Hf 同位素比，包括 OKUM（科马提岩）、WPR-1（蛇纹橄榄岩）、NIM-N（苏长岩）、NIM- P（辉石岩）、UB-N（蛇纹石化橄榄岩）、JP-1（橄榄岩）、NIM-D（纯橄榄岩）、MUH-1（蛇纹石化方辉橄榄岩）、HARZ01（方辉橄榄岩）、DTS-2b（纯橄榄岩），其中含有极其丰富的少量的 Lu 和 Hf（Lu，2–150 ng g ⁻¹；Hf，5–500 ng g ⁻¹）。所有测量均在 Neptune Plus 多接收器电感耦合等离子体质谱仪上进行，该质谱仪采用 Aridus II 去溶剂化器入口系统和 Jet 样品/X 截取锥配置。以下 RM、OKUM、WPR-1、UB-N、JP-1、NIM-D、HARZ01 和 DTS-2b在 0.06 至 0.06 的测试部分具有小于 60 ppm (2 s ) 的¹⁷⁶ Hf/ ¹⁷⁷ Hf 精度0.3 g，是用于 Lu-Hf 系统的良好超镁铁质 RM。相反，在测试部分质量为 0.1 至 0.3 g 的 NIM-N、NIM-P 和 MUH-1 中观察到显着的 Hf 质量分数和同位素变异性。总的来说，我们的研究提供了一个新的数据库，可供地球化学界用来评估镁铁质-超镁铁质岩石的 Lu-Hf 系统。