RW-1独居石的进一步表征：氧和钕同位素微分析的新型工作参考材料,Minerals

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RW-1独居石的进一步表征：氧和钕同位素微分析的新型工作参考材料
Minerals ( IF 2.2 ) Pub Date : 2019-09-26 , DOI: 10.3390/min9100583
Wu , Li , Ling , Yang , Li , Li , Mao , Li , Putlitz

独居石的氧（O）和钕（Nd）同位素组成提供了理想的变质和热液活动示踪剂。用微束技术校准基质效应并监测独居石O-Nd同位素的外部精度，例如二次离子质谱（SIMS）和激光烧蚀-多收集器-电感耦合等离子体质谱（LA-MC-ICPMS），需要特征明确的天然独居石标准物以进行精确的微束测量。但是，可用的标准数量有限，阻碍了独居石O-Nd同位素的应用。在这里，我们报告RW-1独居石作为O-Nd同位素微束分析的潜在新工作参考材料。通过电子探针微分析（EPMA），SIMS进行微束测量，LA-MC-ICPMS和10–24 µm规模已证实，它在元素和O–Nd同位素组成中均是均质的。SIMS测量得出δ¹⁸ O值在一定范围内与通过激光氟化技术获得的值一致。通过热电离质谱（TIMS）对Nd同位素进行的精确分析与LA-MC-ICPMS分析的平均结果一致。我们建议δ ¹⁸ O = 6.30‰±0.16‰（2SD）和¹⁴³的Nd / ¹⁴⁴的Nd = 0.512282±0.000011（2SD）作为参考值用于RW-1独居石。

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Further Characterization of the RW-1 Monazite: A New Working Reference Material for Oxygen and Neodymium Isotopic Microanalysis

The oxygen (O) and neodymium (Nd) isotopic composition of monazite provides an ideal tracer of metamorphism and hydrothermal activity. Calibration of the matrix effect and monitoring of the external precision of monazite O–Nd isotopes with microbeam techniques, such as secondary ion mass spectrometry (SIMS) and laser ablation-multicollector-inductively coupled plasma-mass spectrometry (LA-MC-ICPMS), require well-characterized natural monazite standards for precise microbeam measurements. However, the limited number of standards available is impeding the application of monazite O–Nd isotopes. Here, we report on the RW-1 monazite as a potential new working reference material for microbeam analysis of O–Nd isotopes. Microbeam measurements by electron probe microanalysis (EPMA), SIMS, and LA-MC-ICPMS at 10–24 µm scales have confirmed that it is homogeneous in both elemental and O–Nd isotopic compositions. SIMS measurements yield δ¹⁸O values consistent, within errors, with those obtained by laser fluorination techniques. Precise analyses of Nd isotope by thermal ionization mass spectrometry (TIMS) are consistent with mean results of LA-MC-ICPMS analyses. We recommend δ¹⁸O = 6.30‰ ± 0.16‰ (2SD) and ¹⁴³Nd/¹⁴⁴Nd = 0.512282 ± 0.000011 (2SD) as being the reference values for the RW-1 monazite.

更新日期：2019-09-26

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