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

Author

Listed:
  • Jing-Yao Xu

    (Chinese Academy of Sciences
    Chinese Academy of Sciences)

  • Andrea Giuliani

    (ETH Zurich)

  • Qiu-Li Li

    (Chinese Academy of Sciences
    Chinese Academy of Sciences
    University of Chinese Academy of Sciences)

  • Kai Lu

    (Chinese Academy of Sciences
    University of Chinese Academy of Sciences)

  • Joan Carles Melgarejo

    (University of Barcelona)

  • William L. Griffin

    (Macquarie University)

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.

Suggested Citation

  • Jing-Yao Xu & Andrea Giuliani & Qiu-Li Li & Kai Lu & Joan Carles Melgarejo & William L. Griffin, 2021. "Light oxygen isotopes in mantle-derived magmas reflect assimilation of sub-continental lithospheric mantle material," Nature Communications, Nature, vol. 12(1), pages 1-13, December.
    • Handle: RePEc:nat:natcom:v:12:y:2021:i:1:d:10.1038_s41467-021-26668-z
    DOI: 10.1038/s41467-021-26668-z
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    References listed on IDEAS

    as
    1. Jon Woodhead & Janet Hergt & Andrea Giuliani & Roland Maas & David Phillips & D. Graham Pearson & Geoff Nowell, 2019. "Kimberlites reveal 2.5-billion-year evolution of a deep, isolated mantle reservoir," Nature, Nature, vol. 573(7775), pages 578-581, September.
    2. John M. Eiler & Pierre Schiano & Nami Kitchen & Edward M. Stolper, 2000. "Oxygen-isotope evidence for recycled crust in the sources of mid-ocean-ridge basalts," Nature, Nature, vol. 403(6769), pages 530-534, February.
    3. Trond H. Torsvik & Kevin Burke & Bernhard Steinberger & Susan J. Webb & Lewis D. Ashwal, 2010. "Diamonds sampled by plumes from the core–mantle boundary," Nature, Nature, vol. 466(7304), pages 352-355, July.
    4. James K. Russell & Lucy A. Porritt & Yan Lavallée & Donald B. Dingwell, 2012. "Kimberlite ascent by assimilation-fuelled buoyancy," Nature, Nature, vol. 481(7381), pages 352-356, January.
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