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The relatively low initial Os ratios for both Lisheen (0.253 ± 0.045) and Silvermines (0.453 ± 0.006) are compatible with derivation of Os from these magmas, or from the Caledonian basement that underlies the ore deposits.

Recent paleomagnetic data from Lisheen have been interpreted to indicate post-Variscan epigenetic mineralization at ca.

277 Ma, much younger than previously proposed and in apparent contradiction with Variscan thrust deformation of the ores.

Consequently, genetic models for ore formation are poorly constrained and remain controversial.

The Irish Midlands region contains one of the world’s largest hydrothermal Zn-Pb ore districts, but uncertainty exists in the timing of mineralization relative to host rock ages.

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