Geochronology
Geochronology
GChron
Articles | Volume 8, issue 3
Articles | Volume 8, issue 3
https://doi.org/10.5194/gchron-8-387-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/gchron-8-387-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 8, issue 3
Research article
 | 
08 Jul 2026
Research article |  | 08 Jul 2026

Dating circulations of hydrothermal fluids in the crystalline basements of unconformity-related metal deposits using in situ Rb ∕ Sr geochronology: proof of concept

Quentin Boulogne, Gaétan Milesi, Chantal Peiffert, Emmy Fischer, Christophe Ballouard, Mehdi Serdoun, Thomas Obin, Andreï Lecomte, Pierre Martz, Andrew Kaczowka, and Julien Mercadier

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Short summary
This study investigates Rb–Sr system behavior in hydrothermally altered muscovite using in-situ LA-ICP-MS/MS (Laser Ablation-Inductively Coupled Plasma-Tandem Mass Spectrometry) analyses from the Athabasca Basin. Unaltered muscovite records Paleoproterozoic crystallization ages, whereas muscovite altered to illite and sudoite yields a consistent age of ~1640 Ma, corresponding to alteration halos related to unconformity-type uranium deposits. These results highlight the potential of Rb–Sr dating to constrain hydrothermal processes and fluid–rock interactions.
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