Geochronology
Geochronology
GChron
Articles | Volume 8, issue 1
Articles | Volume 8, issue 1
https://doi.org/10.5194/gchron-8-63-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/gchron-8-63-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 8, issue 1
Research article
 | 
26 Jan 2026
Research article |  | 26 Jan 2026

Improving crystallization and eruption age estimation using U-Th disequilibrium dating of young volcanic zircon

Zoe Moser, Marcel Guillong, Chetan Nathwani, Kurumi Iwahashi, Razvan-Gabriel Popa, and Olivier Bachmann

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Short summary
To improve U-Th zircon dating, we optimized a U-Th-Pb double-dating strategy for young zircon (150–300 ka). We found that the overall U-Th age spectrum is consistent whether assuming a constant melt composition or constant U/Th fractionation between zircon and melt, but testing the representability of the measured glass with the youngest isochron intercept proved essential. A Bayesian model with a uniform prior distribution gave the most accurate estimates of eruption timing for U-Th datasets.
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