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Abstract
The fission-track dating technique has been applied to glassy pseudotachylites from the Alpine Fault Zone of South Island, New Zealand. Of five samples investigated, only one proved sufficientlyglassy to be dated. It yielded a corrected age of 430 000 ± 100 000 years. From the Quaternary uplift rates across the fault zone, crude estimates suggest that the material was generated by slip at a depth of at least 2.2 ± 1.0 km.