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Evidence of ghost plagioclase signature induced by kinetic fractionation of europium in the Earth’s mantle

Author

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  • Romain Tilhac

    (Consejo Superior de Investigaciones Científicas (CSIC) – Universidad de Granada (UGR))

  • Károly Hidas

    (Centro Nacional Instituto Geológico y Minero de España (IGME), CSIC, Project Office of Granada)

  • Beñat Oliveira

    (Macquarie University
    Western Sydney Local Health District)

  • Carlos J. Garrido

    (Consejo Superior de Investigaciones Científicas (CSIC) – Universidad de Granada (UGR))

Abstract

Crustal recycling in the Earth’s mantle is fingerprinted by trace-element and isotopic proxies in oceanic basalts. Positive Eu and Sr anomalies in primitive lavas and melt inclusions that are not otherwise enriched in Al2O3 are often interpreted as reflecting the presence of recycled, plagioclase-rich oceanic crust in their mantle source – referred to as “ghost plagioclase” signatures. Here, we report natural evidence of Eu anomalies and extreme crystal-scale heterogeneity developed kinetically in mantle peridotite clinopyroxene. Numerical modelling shows that diffusional fractionation between clinopyroxene and melts can account for this intra-crystal heterogeneity and generate Eu anomalies without requiring plagioclase. We demonstrate that kinetically induced Eu anomalies are likely to develop at temperatures, redox conditions and transport timescales compatible with the genesis of mid-ocean ridge and ocean island basalts. Our results show that, in the absence of converging lines of evidence such as radiogenic isotope data, ghost plagioclase signatures are not an unequivocal proxy for the presence of recycled crust in oceanic basalt sources.

Suggested Citation

  • Romain Tilhac & Károly Hidas & Beñat Oliveira & Carlos J. Garrido, 2023. "Evidence of ghost plagioclase signature induced by kinetic fractionation of europium in the Earth’s mantle," Nature Communications, Nature, vol. 14(1), pages 1-8, December.
  • Handle: RePEc:nat:natcom:v:14:y:2023:i:1:d:10.1038_s41467-023-36753-0
    DOI: 10.1038/s41467-023-36753-0
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    References listed on IDEAS

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    1. P. D. Asimow & C. H. Langmuir, 2003. "The importance of water to oceanic mantle melting regimes," Nature, Nature, vol. 421(6925), pages 815-820, February.
    2. Zhong-Yuan Ren & Stephanie Ingle & Eiichi Takahashi & Naoto Hirano & Takafumi Hirata, 2005. "The chemical structure of the Hawaiian mantle plume," Nature, Nature, vol. 436(7052), pages 837-840, August.
    3. K. H. Rubin & I. van der Zander & M. C. Smith & E. C. Bergmanis, 2005. "Minimum speed limit for ocean ridge magmatism from 210Pb–226Ra–230Th disequilibria," Nature, Nature, vol. 437(7058), pages 534-538, September.
    4. Alexander V. Sobolev & Albrecht W. Hofmann & Igor K. Nikogosian, 2000. "Recycled oceanic crust observed in ‘ghost plagioclase’ within the source of Mauna Loa lavas," Nature, Nature, vol. 404(6781), pages 986-990, April.
    5. Yaoling Niu & Roger Hékinian, 1997. "Spreading-rate dependence of the extent of mantle melting beneath ocean ridges," Nature, Nature, vol. 385(6614), pages 326-329, January.
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