Quantifying long-term reproducibility of zircon reference materials by U-Pb LA-ICP-MS dating
Date
14/07/2022Metadata
Show full item recordAbstract
Inter-session excess variance of U/Pb and Pb/Pb ratios in LA-ICP-MS zircon dating is the largest contributor to systematic errors, which in turn limit the accuracy of age determinations. Quantifying long-term excess variance of reference materials allows for the estimation of excess variance in samples, but such compilations are not available in the literature. Here, we present the results of over 100 measurement sessions over 6 years for seven common zircon reference materials and calculate a characteristic excess variance for each. For 206Pb/238U ages, these values (2s) are as follows: AusZ7-1 = 1.7% (115 sessions), AusZ7-5 = 0% (74), OD-3 = 0.6% (19), Temora2 = 1.2% (86), Plešovice = 1.1% (100), 91500 = 1.0% (146) and Mud Tank = 3.0% (12). For 207Pb/206Pb ages, smaller excess variances are observed: Temora2 = 0.3%, Plešovice = 0.4%, Mud Tank = 1.7% and 91500 = 0.4%. These values are well-constrained estimates of inter-session excess variance for the ETH Zürich LA-ICP-MS laboratory using a sector-field ICP-MS, and may provide either a first-order estimate for other laboratories or a value to compare against their own reference material compilations.
Citation
Sliwinski , J T , Guillong , M , Horstwood , M S A & Bachmann , O 2022 , ' Quantifying long-term reproducibility of zircon reference materials by U-Pb LA-ICP-MS dating ' , Geostandards and Geoanalytical Research , vol. Early View . https://doi.org/10.1111/ggr.12442
Publication
Geostandards and Geoanalytical Research
Status
Peer reviewed
ISSN
1639-4488Type
Journal article
Description
This study was supported by ETH Research Grant ETH‐34 15‐2. Open access funding provided by Eidgenossische Technische Hochschule Zurich.Collections
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