![]() ![]() In the latest Oligocene, the trench reached the Northland passive margin, which was pulled it into the mantle by the slab, resulting in obduction of the Northland allochthon. 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. 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. North‐eastward subduction followed by slab detachment to explain ophiolite obduction and Early Miocene volcanism in Northland, New Zealand North‐eastward subduction followed by slab detachment to explain ophiolite obduction and Early.
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