Synthetic zircon doped with hafnium and rare earth elements: A reference material for in situ hafnium isotope analysis

Autor: Janne Blichert-Toft, Scott D. Samson, John M. Hanchar, Rebecca Lam, Bruno Dhuime, Christopher M. Fisher, Jeffery D. Vervoort
Přispěvatelé: Department of Earth Sciences [St. John's], Memorial University of Newfoundland [St. John's], Department of Earth Sciences [Syracuse], Syracuse University, Department of Earth Sciences [St Andrews], University of St Andrews [Scotland], School of Earth Sciences [Bristol], University of Bristol [Bristol], Laboratoire de Géologie de Lyon - Terre, Planètes, Environnement [Lyon] (LGL-TPE), Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-École normale supérieure - Lyon (ENS Lyon), School of Earth and Environmental Sciences, Washington State University (WSU), INCO Innovation Centre, Memorial Unversity of Newfoundland, Mineralogical Society of America, Canadian Natural Sciences and Research Council (NSERC), University of Newfoundland, INSU : Institut National des Sciences de l'Univers, NERC : NE/E005225/1Memorial, Department of Earth and Environmental Sciences, George Washington University, The George Washington University (GW), Laboratoire de Sciences de la Terre (LST), Memorial University of Newfoundland = Université Memorial de Terre-Neuve [St. John's, Canada] (MUN), Laboratoire de Géologie de Lyon - Terre, Planètes, Environnement (LGL-TPE), École normale supérieure de Lyon (ENS de Lyon)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut national des sciences de l'Univers (INSU - CNRS)-Université Jean Monnet - Saint-Étienne (UJM)-Centre National de la Recherche Scientifique (CNRS), Université de Lyon-Université de Lyon-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)
Jazyk: angličtina
Rok vydání: 2011
Předmět:
Zdroj: Chemical Geology
Chemical Geology, Elsevier, 2011, 286 (1-2), pp.32-47. ⟨10.1016/j.chemgeo.2011.04.013⟩
Chemical Geology, 2011, 286 (1-2), pp.32-47. ⟨10.1016/j.chemgeo.2011.04.013⟩
ISSN: 0009-2541
DOI: 10.1016/j.chemgeo.2011.04.013⟩
Popis: International audience; A series of flux-grown synthetic zircon crystals doped with Hf and selected rare earth elements (REE) were produced for use as a potential reference material for Lu-Hf isotopic analysis of zircon by in situ laser ablation multi-collector inductively-coupled plasma mass spectrometry (LA-MC-ICPMS). The synthetic zircon crystals were doped such as to produce a large range of REE/Hf, allowing for a robust means of monitoring and correcting the sometimes large (176)Yb and (176)Lu isobaric interferences on the low-abundance (176)Hf in natural zircon, as well as potential oxide interferences from Gd, Tb, and Dy. The synthetic zircon crystals have a homogeneous Hf isotopic composition, both within and between grains, as documented by solution MC-ICPMS analyses of Hf chemically separated from multiple fragments of zircon from three different syntheses, and 321 laser ablation MC-ICPMS analyses done in two different laboratories. An additional 110 in situ analyses of natural zircon crystals reveal identical behavior of natural and synthetic zircon during Hf isotope analysis by laser ablation. Hence, the synthetic zircon crystals provide a means of monitoring a wide range of Yb and Lu interferences (up to 50% of the total signal intensity at mass 176) during routine isotopic analysis for geological studies. They also may be helpful in developing improved laboratory protocols for accurate in situ Lu-Hf isotopic measurement of natural zircon. The present data illustrate the importance of the (176)Yb interference correction on (176)Hf, which can result in large biases if not properly applied to natural samples with their variable and often high (176)Yb/(177)Hf. This study definitively shows that use of high-REE/Hf synthetic zircon standards for calibrating the Yb mass bias correction is more accurate than use of Yb-doped natural Hf solutions. Finally, the results of the present work suggest that synthetic minerals may prove useful as both in situ method development tools and isotopic reference materials.
Databáze: OpenAIRE
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