Potassium-argon ages for the Dunedin volcano and outlying volcanics

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Abstract

Potassium-argon ages for nine rocks from the Dunedin volcano range from 13.1 ± 0.1 m.y, for Initial Eruptive Phase trachyte, to 10.1 ± 0.2 m.y. for a Third Main Eruptive Phase phonolite. The earliest of these dates defines an event in Southland (or, less probably, in earliest Taranaki) time; the full span of the activity was within the Miocene. Ages of about 15 to 16m.y. and 12.8 ± 0.2 m.y. are recorded for two representatives of the Waipiata Volcanic Formation, and serve to date the onset of major movements of the Kaikoura Orogeny in eastern Otago. The K-Ar results for rocks which have been examined paleomagnetically are compared with the polarity time scale derived from oceanic magnetic anomaly profiles. © 1973 Taylor & Francis Group, LLC.

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McDougall, I., & Coombs, D. S. (1973). Potassium-argon ages for the Dunedin volcano and outlying volcanics. New Zealand Journal of Geology and Geophysics, 16(2), 179–188. https://doi.org/10.1080/00288306.1973.10431451

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