The Ngatutura Volcanics, Southwest Auckland
- 1 June 1975
- journal article
- research article
- Published by Taylor & Francis in Journal of the Royal Society of New Zealand
- Vol. 5 (2), 163-178
- https://doi.org/10.1080/03036758.1975.10419370
Abstract
Basaltic volcanism occurred in three centres at Ohuka, southwest Auckland, in response to late Pliocene-early Pleistocene fault movements. Eruption took place at, or close to, sea level, and volcanoclastic deposits at each centre include agglomerates, sub-aqueous breccias of terrestrial origin, and laharic breccias. Associated flow and dyke rocks are well-jointed, fine-grained alkali olivine basalts which display little variation in their petrographic, mineralogical, and che:nical characters.Keywords
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