The Ngatutura Volcanics, Southwest Auckland

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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.

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