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Issue 1, 2017
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U–Pb age determination for zircons using laser ablation-ICP-mass spectrometry equipped with six multiple-ion counting detectors

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Abstract

Precise zircon U–Pb age determinations have been made on Plešovice zircon using laser ablation-multiple ion counting-inductively coupled plasma-mass spectrometry (LA-MIC-ICP-MS). To achieve high precision and high spatial resolution age determination, multiple ion counting using six electron multipliers was employed. The intensities of Hg–Pb–U isotope (202Hg, 204(Hg + Pb), 206Pb, 207Pb, 208Pb, and 238U) signals were monitored simultaneously without mass scanning. In static acquisition mode, the resultant 238U–206Pb concordia age for Plešovice was 336.3 ± 1.9 Ma, demonstrating improved precision over that achieved using a magnetic sector-based single-collector-ICP-MS, which was 340.3 ± 3.5 Ma for Plešovice. A high duty cycle can be achieved, along with a short integration time or a small sample volume for analysis, allowing high spatial resolution. More importantly, downhole fractionation can be reduced with a shallow ablation pit. To take full advantage of the setup, a one-second LA analysis (8 laser shots with an 8 Hz repetition rate) was adopted for U–Pb age determination. The resultant concordia age for Plešovice was 339.5 ± 6.7 Ma, demonstrating that the repeatability and laboratory bias precision of the resultant age data were comparable to conventional ablation with a single-collector-ICP-MS. The depths and crater diameters of the ablation pits were, respectively, about >1 μm and 25 μm. The data presented herein demonstrate clearly that multiple ion counting-ICP-MS can become a fast and user-friendly tool for use in U–Pb zircon geochronology.

Graphical abstract: U–Pb age determination for zircons using laser ablation-ICP-mass spectrometry equipped with six multiple-ion counting detectors

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Supplementary files

Article information


Submitted
25 Aug 2016
Accepted
20 Oct 2016
First published
20 Oct 2016

J. Anal. At. Spectrom., 2017,32, 88-95
Article type
Paper

U–Pb age determination for zircons using laser ablation-ICP-mass spectrometry equipped with six multiple-ion counting detectors

K. Hattori, S. Sakata, M. Tanaka, Y. Orihashi and T. Hirata, J. Anal. At. Spectrom., 2017, 32, 88
DOI: 10.1039/C6JA00311G

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