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

This study presents U-Pb 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...

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Bibliographic Details
Published in:Journal of analytical atomic spectrometry 2020, Vol.35 (1), p.2282-2297
Main Authors: Thompson, Jay M, Danyushevsky, Leonid V, Borovinskaya, Olga, Tanner, Martin
Format: Article
Language:English
Subjects:
Ablation
Accuracy
Geochronology
Inductively coupled plasma mass spectrometry
Isotopes
Laser ablation
Linearity
Mathematical analysis
Quadrupoles
Radiometric dating
Trace elements
Uncertainty analysis
Zircon
Zirconium
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Summary:This study presents U-Pb 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 U-Pb ages in the mineral zircon. The time-of-flight ICP-MS however shows slight non-linearity at high detector counts (>7000 for 238 U) producing a bias in zircon U-Pb ages from published values outside analytical uncertainty. Use of 235 U instead of 238 U is shown to resolve the inaccuracy in the U-Pb age at the expense of analytical precision due to lower abundance of 235 U. Trace element concentrations also measured along with U-Pb 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 U-Pb geochronology. This study presents U-Pb isotopic and trace element results from the mineral zircon measured by nanosecond laser ablation coupled to either a time-of-flight ICP-MS, a quadrupole ICP-MS or both via a split stream arrangement.
ISSN:0267-9477
1364-5544
DOI:10.1039/d0ja00252f