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This study presents a new high-precision 40 Ar/ 39 Ar age for the Devonian hot-spring system at Rhynie. Hydrothermal K-feldspar sampled from two veins that represent feeder conduits and a hydrothermally altered andesite wall rock, date the hydrothermal activity, the fossilised biota, and syn – K-feldspar gold mineralization at 403.9±2.1Ma (2σ). Oxygen isotope data for the parent fluid...