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Time-of-flight ICP-MS laser ablation zircon geochronology: Assessment and comparison against quadrupole ICP-MS

Citation

Thompson, JM and Danyushevsky, LV and Borovinskaya, O and Tanner, M, Time-of-flight ICP-MS laser ablation zircon geochronology: Assessment and comparison against quadrupole ICP-MS, Journal of Analytical Atomic Spectrometry, 35, (10) pp. 2282-2297. ISSN 0267-9477 (2020) [Refereed Article]

Copyright Statement

This journal is The Royal Society of Chemistry 2020

DOI: doi:10.1039/d0ja00252f

Abstract

This study presents UPb isotopic results from the mineral zircon measured by nanosecond laser ablation coupled to either a time-of-flight inductively coupled plasma mass spectrometer (ICP-MS), a quadrupole ICP-MS or both via a split stream arrangement. Results show both ICP-MS types produce similar levels of precision and accuracy for most UPb ages in the mineral zircon. The time-of-flight ICP-MS however shows slight non-linearity at high detector counts (> 7000 for 238U) producing a bias in zircon UPb ages from published values outside analytical uncertainty. Use of 235U instead of 238U is shown to resolve the inaccuracy in the UPb age at the expense of analytical precision due to lower abundance of 235U. Trace element concentrations also measured along with UPb isotope data in zircon show the time-of-flight ICP-MS to provide similar accuracy and precision as the quadrupole ICP-MS, except for isotopes in regions around high intensity major element peaks (e.g. Zr) where accuracy and levels of detection of the time-of-flight ICP-MS are matrix dependent relative to the quadrupole ICP-MS. A comparison is made between the analytical capabilities of the time-of-flight ICP-MS and the quadrupole ICP-MS highlighting some advantages and disadvantages of the time-of-flight technology for zircon UPb geochronology.

Item Details

Item Type:Refereed Article
Keywords:zircon, LA-ICPMS, time of flight MS, split stream LA-ICPMS
Research Division:Earth Sciences
Research Group:Geology
Research Field:Geochronology
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the earth sciences
UTAS Author:Thompson, JM (Mr Jay Thompson)
UTAS Author:Danyushevsky, LV (Professor Leonid Danyushevsky)
ID Code:144704
Year Published:2020
Funding Support:Australian Research Council (IH130200004)
Web of Science® Times Cited:1
Deposited By:CODES ARC
Deposited On:2021-06-06
Last Modified:2021-07-28
Downloads:0

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