首页|In-run measuring (HfO)-Hf-177-O-16/Hf-177 as a routine technique for in-situ Hf isotopic compositions analysis in zirconium-bearing minerals by laser ablation MC-ICP-MS

In-run measuring (HfO)-Hf-177-O-16/Hf-177 as a routine technique for in-situ Hf isotopic compositions analysis in zirconium-bearing minerals by laser ablation MC-ICP-MS

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  • NSTL
  • Elsevier
Problems with REE oxide interferences during in-situ Hf isotope analysis in zirconium-bearing minerals can give rise to inaccuracies in the obtained dataset. In this study, we present an in-run 177Hf16O/177Hf measurement protocol pertaining to in-situ Hf isotope analysis by laser ablation multi-collector inductively coupled plasma mass spectrometry (LA-MC-ICP-MS) as a routine method, allowing for a robust real-time method of monitoring the oxide formation rates and offering a method to monitor REE oxide interferences (e.g., Gd and Dy). For this purpose, we set up a static data collection mode to measure Hf isotopes and 177Hf16O signals concurrently in-run. By analyzing zirconium-bearing minerals characterized with a broad range of Dy/Hf and Gd/Hf ratios (e.g., zircon: typically, 0.0001-0.022 for Dy/Hf and 0.00002-0.013 for Gd/Hf; zirconolite: typically, >0.2 for Dy/Hf and > 0.4 for Gd/Hf; eudialyte: typically, >0.1 for Dy/Hf and > 0.1 for Gd/Hf), influences of oxide formation rate on 176Hf/177Hf ratios are investigated via the present in-run method. The level of oxide formation during the analysis is found to impact the measurement accuracy, especially for samples with higher REE/Hf ratios. Therefore, it is imperative that oxide ratios should be routinely monitored for daily in-situ Hf isotope analysis along with oxide formation rates. In addition, based on results of the present work, a higher REE/Hf zircon, like SA02 zircon, is strongly recommended as the primary refence material for routine in-situ analysis of Hf isotopic compositions in zircons to carefully test the accuracy of analysis for zircons.

Hf isotopesIn-situ analysisOxidesReal -time methodLA-MC-ICP-MSZirconium-bearing mineralINDUCTIVELY-COUPLED PLASMARARE-EARTH-ELEMENTSNATURAL REFERENCE MATERIALU-PB GEOCHRONOLOGYMASS SPECTROMETRYOXIDE IONSCOMPLEX ZIRCONSPOLYATOMIC IONSRATIO ANALYSISTRACE-ELEMENT

Huang, Chao、Yang, Yueheng、Wang, Hao、Xie, Liewen、Wu, Shitou、Xu, Lei、Yang, Jinhui、Wu, Fuyuan

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Chinese Acad Sci

2022

10.1016/j.sab.2022.106486

Spectrochimica Acta

Spectrochimica Acta

ISSN：0584-8547
年,卷(期)：2022.194
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