Louisville seamount subduction and its implication on mantle flow beneath the central Tonga–Kermadec arc

Christian Timm (), Daniel Bassett, Ian J. Graham, Matthew I. Leybourne, Cornel E. J. de Ronde, Jon Woodhead, Daniel Layton-Matthews and Anthony B. Watts
Additional contact information
Christian Timm: GNS Science
Daniel Bassett: University of Oxford
Ian J. Graham: GNS Science
Matthew I. Leybourne: GNS Science
Cornel E. J. de Ronde: GNS Science
Jon Woodhead: School of Earth Sciences, University of Melbourne
Daniel Layton-Matthews: Queen’s University
Anthony B. Watts: University of Oxford

Nature Communications, 2013, vol. 4, issue 1, 1-9

Abstract: Abstract Subduction of intraplate seamounts beneath a geochemically depleted mantle wedge provides a seldom opportunity to trace element recycling and mantle flow in subduction zones. Here we present trace element and Sr, Nd and Pb isotopic compositions of lavas from the central Tonga–Kermadec arc, west of the contemporary Louisville–Tonga trench intersection, to provide new insights into the effects of Louisville seamount subduction. Elevated 206Pb/204Pb, 208Pb/204Pb, 86Sr/87Sr in lavas from the central Tonga–Kermadec arc front are consistent with localized input of subducted alkaline Louisville material (lavas and volcaniclastics) into sub-arc partial melts. Furthermore, absolute Pacific Plate motion models indicate an anticlockwise rotation in the subducted Louisville seamount chain that, combined with estimates of the timing of fluid release from the subducting slab, suggests primarily trench-normal mantle flow beneath the central Tonga–Kermadec arc system.

Date: 2013
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DOI: 10.1038/ncomms2702

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