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

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.
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Submitted on : Friday, March 25, 2022 - 10:24:43 AM
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Roman Golowin, Maxim Portnyagin, Kaj Hoernle, Folkmar Hauff, Andrey Gurenko, et al.. Boninite-like intraplate magmas from Manihiki Plateau require ultra-depleted and enriched source components. Nature Communications, Nature Publishing Group, 2017, 8, pp.14322. ⟨10.1038/ncomms14322⟩. ⟨insu-03619403⟩

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