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

Christian Timm (), Bryan Davy, Karsten Haase, Kaj A. Hoernle, Ian J. Graham, Cornel E. J. de Ronde, Jon Woodhead, Dan Bassett, Folkmar Hauff, Nick Mortimer, Hannu C. Seebeck, Richard J. Wysoczanski, Fabio Caratori-Tontini and John A. Gamble
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Christian Timm: GNS Science
Bryan Davy: GNS Science
Karsten Haase: Geozentrum Nordbayern, Universität Erlangen-Nürnberg
Kaj A. Hoernle: GEOMAR Helmholtz Centre for Ocean Research, FB4
Ian J. Graham: GNS Science
Cornel E. J. de Ronde: GNS Science
Jon Woodhead: School of Earth Sciences, University of Melbourne
Dan Bassett: University of Oxford
Folkmar Hauff: GEOMAR Helmholtz Centre for Ocean Research, FB4
Nick Mortimer: GNS Science
Hannu C. Seebeck: GNS Science
Richard J. Wysoczanski: National Institute of Water and Atmospheric Research
Fabio Caratori-Tontini: GNS Science
John A. Gamble: School of Geography, Environment and Earth Sciences, Victoria University of Wellington

Nature Communications, 2014, vol. 5, issue 1, 1-9

Abstract: Abstract Large igneous province subduction is a rare process on Earth. A modern example is the subduction of the oceanic Hikurangi Plateau beneath the southern Kermadec arc, offshore New Zealand. This segment of the arc has the largest total lava volume erupted and the highest volcano density of the entire Kermadec arc. Here we show that Kermadec arc lavas south of ~32°S have elevated Pb and Sr and low Nd isotope ratios, which argues, together with increasing seafloor depth, forearc retreat and crustal thinning, for initial Hikurangi Plateau—Kermadec arc collision ~250 km north of its present position. The combined data set indicates that a much larger portion of the Hikurangi Plateau (the missing Ontong Java Nui piece) than previously believed has already been subducted. Oblique plate convergence caused southward migration of the thickened and buoyant oceanic plateau crust, creating a buoyant ‘Hikurangi’ mélange beneath the Moho that interacts with ascending arc melts.

Date: 2014
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DOI: 10.1038/ncomms5923

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