Boninite-like intraplate magmas from Manihiki Plateau require ultra-depleted and enriched source components

Roman Golowin (), Maxim Portnyagin, Kaj Hoernle, Folkmar Hauff, Andrey Gurenko, Dieter Garbe-Schönberg, Reinhard Werner and Simon Turner
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Roman Golowin: GEOMAR Helmholtz Centre for Ocean Research Kiel
Maxim Portnyagin: GEOMAR Helmholtz Centre for Ocean Research Kiel
Kaj Hoernle: GEOMAR Helmholtz Centre for Ocean Research Kiel
Folkmar Hauff: GEOMAR Helmholtz Centre for Ocean Research Kiel
Andrey Gurenko: Centre de Recherches Pétrographiques et Géochimiques, UMR 7358, Université de Lorraine
Dieter Garbe-Schönberg: Christian-Albrechts-University of Kiel
Reinhard Werner: GEOMAR Helmholtz Centre for Ocean Research Kiel
Simon Turner: Macquarie University

Nature Communications, 2017, vol. 8, issue 1, 1-10

Abstract: Abstract The Ontong Java and Manihiki oceanic plateaus are believed to have formed through high-degree melting of a mantle plume head. Boninite-like, low-Ti basement rocks at Manihiki, however, imply a more complex magma genesis compared with Ontong Java basement lavas that can be generated by ∼30% melting of a primitive mantle source. Here we show that the trace element and isotope compositions of low-Ti Manihiki rocks can best be explained by re-melting of an ultra-depleted source (possibly a common mantle component in the Ontong Java and Manihiki plume sources) re-enriched by ≤1% of an ocean-island-basalt-like melt component. Unlike boninites formed via hydrous flux melting of refractory mantle at subduction zones, these boninite-like intraplate rocks formed through adiabatic decompression melting of refractory plume material that has been metasomatized by ocean-island-basalt-like melts. Our results suggest that caution is required before assuming all Archaean boninites were formed in association with subduction processes.

Date: 2017
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DOI: 10.1038/ncomms14322

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