Geochronology
Geochronology
GChron
Articles | Volume 7, issue 3
Articles | Volume 7, issue 3
https://doi.org/10.5194/gchron-7-309-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/gchron-7-309-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 7, issue 3
Research article
 | 
06 Aug 2025
Research article |  | 06 Aug 2025

Zircon micro-inclusions as an obstacle for in situ garnet U–Pb geochronology: an example from the As Sifah eclogite locality, Oman

Jesse B. Walters, Joshua M. Garber, Aratz Beranoaguirre, Leo J. Millonig, Axel Gerdes, Tobias Grützner, and Horst R. Marschall

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Short summary
Garnet U–Pb dating is useful for dating geologic events. However, contamination by U-rich minerals included in garnet is a risk. Inclusions are often spotted by high-U spikes or large errors in the age. We dated garnets in metamorphic rocks and calculated ages 10–15 Myr older than expected, reflecting contamination by the mineral zircon. We provide recommendations for identifying contamination and suggest that the bulk dating of zircon inclusions in garnet may also provide valuable information.
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