Abstract
Abstract K‐Ar age measurements using the 40Ar/39Ar total fusion technique on nephrite from two occurrences in the Great Serpentine Belt southeast of Tamworth yielded ages of 273 ± 5.8 and 280 ± 5.6 m.y. The K‐Ar ages indicate that tectonic emplacement, during which the nephrite was produced as a reaction product between ultra‐mafic rock and country rock, occurred early in the Permian about 275–280 m.y. ago.
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