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.
| Language | English |
|---|---|
| Article number | 14322 |
| Pages | 1-10 |
| Number of pages | 10 |
| Journal | Nature Communications |
| Volume | 8 |
| DOIs | |
| Publication status | Published - 9 Feb 2017 |
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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.Cite this
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Boninite-like intraplate magmas from Manihiki Plateau require ultra-depleted and enriched source components. / Golowin, Roman; Portnyagin, Maxim; Hoernle, Kaj; Hauff, Folkmar; Gurenko, Andrey; Garbe-Schönberg, Dieter; Werner, Reinhard; Turner, Simon.
In: Nature Communications, Vol. 8, 14322, 09.02.2017, p. 1-10.Research output: Contribution to journal › Article › Research › peer-review
TY - JOUR
T1 - Boninite-like intraplate magmas from Manihiki Plateau require ultra-depleted and enriched source components
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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=85012154118&partnerID=8YFLogxK
U2 - 10.1038/ncomms14322
DO - 10.1038/ncomms14322
M3 - Article
VL - 8
SP - 1
EP - 10
JO - Nature Communications
T2 - Nature Communications
JF - Nature Communications
SN - 2041-1723
M1 - 14322
ER -