Primordial neon and the deep mantle origin of kimberlites

Andrea Giuliani (), Mark D. Kurz, Peter H. Barry, Joshua M. Curtice, Finlay M. Stuart, Senan Oesch, Quentin Charbonnier, Bradley J. Peters, Janne M. Koornneef, Kristoffer Szilas and D. Graham Pearson
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Andrea Giuliani: ETH Zurich
Mark D. Kurz: Woods Hole Oceanographic Institution
Peter H. Barry: Woods Hole Oceanographic Institution
Joshua M. Curtice: Woods Hole Oceanographic Institution
Finlay M. Stuart: Scottish Universities Environmental Research Centre
Senan Oesch: ETH Zurich
Quentin Charbonnier: ETH Zurich
Bradley J. Peters: ETH Zurich
Janne M. Koornneef: Vrije Universiteit Amsterdam
Kristoffer Szilas: University of Copenhagen
D. Graham Pearson: University of Alberta

Nature Communications, 2025, vol. 16, issue 1, 1-13

Abstract: Abstract The genesis of kimberlites is unclear despite the economic and scientific interest surrounding these diamond-bearing magmas. One critical question is whether they tap ancient, deep mantle domains or the shallow convecting mantle with partial melting triggered by plumes or plate tectonics. To address this question, we report the He-Ne-Ar isotopic compositions of magmatic fluids trapped in olivine from kimberlites worldwide. The kimberlites which have been least affected by addition of deeply subducted or metasomatic components have Ne isotopes less nucleogenic than the upper mantle, hence requiring a deep-mantle origin. This is corroborated by previous evidence of small negative W isotope anomalies and kimberlite location along age-progressive hot-spot tracks. The lack of strong primordial He isotope signatures indicates overprinting by lithospheric and crustal components, which suggests that Ne isotopes are more robust tracers of deep-mantle contributions in intraplate continental magmas. The most geochemically depleted kimberlites may preserve deep remnants of early-Earth heterogeneities.

Date: 2025
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DOI: 10.1038/s41467-025-58625-5

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