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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.

SUBMITTER: Golowin R

PROVIDER: S-EPMC5309764 | biostudies-literature | 2017 Feb

REPOSITORIES: biostudies-literature

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

Golowin Roman R Portnyagin Maxim M Hoernle Kaj K Hauff Folkmar F Gurenko Andrey A Garbe-Schönberg Dieter D Werner Reinhard R Turner Simon S

Nature communications 20170209

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 ma ...[more]

PMID: 28181497

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Dataset Information

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

Publications

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

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