Geochronology
Geochronology
GChron
Articles | Volume 8, issue 3
Articles | Volume 8, issue 3
https://doi.org/10.5194/gchron-8-495-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/gchron-8-495-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 8, issue 3
Research article
 | 
10 Sep 2026
Research article |  | 10 Sep 2026

U-Pb dating of sub-ng g−1 U garnet by LA-MC-ICP-MS

Aratz Beranoaguirre, Leo J. Millonig, Richard Albert, Horst R. Marschall, and Axel Gerdes

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Short summary
We present a high-sensitivity laser ablation multi-collector inductively coupled plasma mass spectrometry (LA-MC-ICP-MS) method for in-situ U–Pb dating of garnet with under 1 ng g⁻¹ U. Using ion counters, geologically meaningful ages are obtained from garnets with up to three orders of magnitude less uranium than standard in-situ U–Pb dating. This expands garnet petrochronology to low-U metamorphic rocks.
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