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Impact of air, laser pulse width and fluence on U-Pb dating of zircons by LA-ICPMS

Citation

Thompson, JM and Meffre, S and Danyushevsky, L, Impact of air, laser pulse width and fluence on U-Pb dating of zircons by LA-ICPMS, Journal of Analytical Atomic Spectrometry, 33, (2) pp. 221-230. ISSN 0267-9477 (2018) [Refereed Article]

Copyright Statement

The Royal Society of Chemistry 2018

DOI: doi:10.1039/C7JA00357A

Abstract

The accuracy of zircon UPb dating by LA-ICPMS is limited by matrix effects related to differences in UPb fractionation between an unknown and the calibration standard. Zircon radiation dose has a strong influence on the ablation rate, which in turn affects the amount of UPb fractionation and subsequent age calculations. Presented in this study is a previously unrecognized source of uncertainty in LA-ICPMS UPb ages due to variations of atmospheric air absorbed onto the surfaces of samples. Laser properties such as fluence (J cm−2) will change the laser ablation rate, and therefore the degree of UPb fractionation, and this can change the amount of zircon matrix effect. To improve the accuracy of UPb dating by LA-ICPMS, a systematic error component related to radiation dose needs to be included, or alternatively a correction to UPb dates can be applied as a function of radiation dose relative to the primary calibration standard. This study proposes a method to calculate a correction factor for the zircon matrix effect by measurement of several zircon reference materials with varying radiation dosages.

Item Details

Item Type:Refereed Article
Keywords:zircon, dating
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 (Ms Jen Thompson)
UTAS Author:Meffre, S (Dr Sebastien Meffre)
UTAS Author:Danyushevsky, L (Professor Leonid Danyushevsky)
ID Code:126598
Year Published:2018
Funding Support:Australian Research Council (CE0561595)
Web of Science® Times Cited:9
Deposited By:CODES ARC
Deposited On:2018-06-19
Last Modified:2019-03-12
Downloads:0

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