North-eastward subduction followed by slab detachment to explain ophiolite obduction and Early Miocene volcanism in Northland, New Zealand
Oligocene-Miocene models for northern New Zealand, involving south-westward subduction to explain Early Miocene Northland volcanism, do not fit within the regional Southwest Pacific tectonic framework. A new model is proposed, which comprises a north-east-dipping South Loyalty basin slab that retreated south-westward in the Eocene-earliest Miocene and was continuous with the north-east-dipping subduction zone of New Caledonia. In the latest Oligocene, the trench reached the Northland passive...[Show more]
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