Melt inclusions provide unique insights into magmatic sources and processes. This study presents a method for simultaneously measuring Pb isotopes and trace elements in melt inclusions using a 193 nm excimer laser ablation system coupled to a multiple‐collector inductively coupled plasma‐mass spectrometer (MC‐ICP‐MS) and a sector‐field ICP‐MS (SF‐ICP‐MS). The ablated aerosol was split with a Y‐shaped connector into two gas streams, which were simultaneously transported into two mass spectrometers. Lead isotopes were measured on the MC‐ICP‐MS, while trace element concentrations were determined on the SF‐ICP‐MS. Little analytical bias was observed when the aerosol is divided into variable proportions (5:5, 6:4, 7:3, 8:2–9:1) to the two instruments. The precision and accuracy of this method were evaluated by analyzing five geological reference glasses with two laser spot diameters (33, and 45 μm). All the 33 measured trace element concentrations are consistent with the reference values (±10%) and have precisions less than 15% (2RSD). The precisions of the ²⁰⁸Pb/²⁰⁶Pb, and ²⁰⁷Pb/²⁰⁶Pb ratios correlate with Pb concentrations. From BHVO‐2G (Pb = 1.6 ppm) to TB‐1G (Pb = 16.1 ppm), the precision on these ratios improve from about 0.4%–0.2% with a 33 μm laser spot diameter. The mean Pb isotope ratios for the five reference glasses are within 0.15% of the reference values. Using our new method, Pb isotope ratios and trace element contents of plagioclase‐hosted melt inclusions in a mid‐ocean ridge basalt from the Indian Ocean were measured.

中文翻译：

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用LASS-ICP-MS同时测定熔体夹杂物中的Pb同位素比和痕量元素浓度

熔体包裹体提供了对岩浆来源和过程的独特见解。这项研究提出了一种使用193 nm受激准分子激光烧蚀系统，多收集器电感耦合等离子体质谱仪（MC-ICP-MS）和扇形场ICP-MS同时测量熔体中Pb同位素和痕量元素的方法MS（SF‐ICP‐MS）。烧蚀后的气溶胶通过Y型连接器分成两股气流，并同时输送到两台质谱仪中。在MC‐ICP‐MS上测量铅同位素，而在SF‐ICP‐MS上测定痕量元素浓度。当将气雾剂分成两种仪器的可变比例（5：5、6：4、7：3、8：2–9：1）时，几乎观察不到分析偏差。通过分析五个具有两个激光光斑直径（33和45μm）的地质参考玻璃，评估了该方法的精度和准确性。所测量的所有33种痕量元素浓度均与参考值一致（±10％），并且精度低于15％（2RSD）。的精度²⁰⁸ Pb / ²⁰⁶ Pb和²⁰⁷ Pb / ²⁰⁶ Pb的比例与Pb浓度相关。从BHVO-2G（Pb = 1.6 ppm）到TB-1G（Pb = 16.1 ppm），使用33μm激光光斑直径时，这些比率的精度从约0.4％-0.2％提高。五个参考玻璃的平均Pb同位素比在参考值的0.15％以内。使用我们的新方法，测量了印度洋中洋脊玄武岩中斜长石溶质包裹体中铅的同位素比和微量元素含量。