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Large igneous province subduction is a rare process on Earth. A modern example is the\udsubduction of the oceanic Hikurangi Plateau beneath the southern Kermadec arc, offshore\udNew Zealand. This segment of the arc has the largest total lava volume erupted and the\udhighest volcano density of the entire Kermadec arc. Here we show that Kermadec arc lavas\udsouth of B32°S have elevated Pb and Sr and low Nd isotope ratios, which argues, together\udwith increasing seafloor depth, forearc retreat and crustal thinning, for initial Hikurangi\udPlateau—Kermadec arc collision B250 km north of its present position. The combined data\udset indicates that a much larger portion of the Hikurangi Plateau (the missing Ontong Java\udNui piece) than previously believed has already been subducted. Oblique plate convergence\udcaused southward migration of the thickened and buoyant oceanic plateau crust, creating a\udbuoyant ‘Hikurangi’ me´lange beneath the Moho that interacts with ascending arc melts

Subduction of the oceanic Hikurangi Plateau and its impact on the Kermadec arc