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; Simon Turner

doi:10.1038/ncomms14322

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, Simon Turner

^*Corresponding author for this work

Research output: Contribution to journal › Article

22 Citations (Scopus)

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.

Original language	English
Article number	14322
Pages (from-to)	1-10
Number of pages	10
Journal	Nature Communications
Volume	8
DOIs	https://doi.org/10.1038/ncomms14322
Publication status	Published - 9 Feb 2017

Bibliographical note

Copyright the Author(s) 2017. Version archived for private and non-commercial use with the permission of the author/s and according to publisher conditions. For further rights please contact the publisher.

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title = "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.",

author = "Roman Golowin and Maxim Portnyagin and Kaj Hoernle and Folkmar Hauff and Andrey Gurenko and Dieter Garbe-Sch{\"o}nberg and Reinhard Werner and Simon Turner",

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AU - Golowin, Roman

AU - Portnyagin, Maxim

AU - Hoernle, Kaj

AU - Hauff, Folkmar

AU - Gurenko, Andrey

AU - Garbe-Schönberg, Dieter

AU - Werner, Reinhard

AU - Turner, Simon

N1 - Copyright the Author(s) 2017. Version archived for private and non-commercial use with the permission of the author/s and according to publisher conditions. For further rights please contact the publisher.

PY - 2017/2/9

Y1 - 2017/2/9

N2 - 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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