Light oxygen isotopes in mantle-derived magmas reflect assimilation of sub-continental lithospheric mantle material

Jing-Yao Xu, Andrea Giuliani, Qiu-Li Li (), Kai Lu, Joan Carles Melgarejo and William L. Griffin
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Jing-Yao Xu: Chinese Academy of Sciences
Andrea Giuliani: ETH Zurich
Qiu-Li Li: Chinese Academy of Sciences
Kai Lu: Chinese Academy of Sciences
Joan Carles Melgarejo: University of Barcelona
William L. Griffin: Macquarie University

Nature Communications, 2021, vol. 12, issue 1, 1-13

Abstract: Abstract Oxygen isotope ratios in mantle-derived magmas that differ from typical mantle values are generally attributed to crustal contamination, deeply subducted crustal material in the mantle source or primordial heterogeneities. Here we provide an alternative view for the origin of light oxygen-isotope signatures in mantle-derived magmas using kimberlites, carbonate-rich magmas that assimilate mantle debris during ascent. Olivine grains in kimberlites are commonly zoned between a mantle-derived core and a magmatic rim, thus constraining the compositions of both mantle wall-rocks and melt phase. Secondary ion mass spectrometry (SIMS) analyses of olivine in worldwide kimberlites show a remarkable correlation between mean oxygen-isotope compositions of cores and rims from mantle-like 18O/16O to lower ‘crustal’ values. This observation indicates that kimberlites entraining low-18O/16O olivine xenocrysts are modified by assimilation of low-18O/16O sub-continental lithospheric mantle material. Interaction with geochemically-enriched domains of the sub-continental lithospheric mantle can therefore be an important source of apparently ‘crustal’ signatures in mantle-derived magmas.

Date: 2021
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DOI: 10.1038/s41467-021-26668-z

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