Calcium isotopic evidence for the mantle sources of carbonatites | Zendy

Elsa Amsellem | Zendy; Frédéric Moynier | Zendy; Hervé Bertrand | Zendy; Amaury Bouyon | Zendy; João Mata | Zendy; Sebastian Tappe | Zendy; James M.D. Day | Zendy

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Calcium isotopic evidence for the mantle sources of carbonatites

Author(s) -

Elsa Amsellem,

Frédéric Moynier,

Hervé Bertrand,

Amaury Bouyon,

João Mata,

Sebastian Tappe,

James M.D. Day

Publication year - 2020

Publication title -

science advances

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 5.928

H-Index - 146

ISSN - 2375-2548

DOI - 10.1126/sciadv.aba3269

Subject(s) - carbonatite , mantle (geology) , geology , geochemistry , igneous rock , basalt , isotopic signature , silicate , calcium carbonate , isotope , mineralogy , chemistry , physics , organic chemistry , quantum mechanics

The origin of carbonatites-igneous rocks with more than 50% of carbonate minerals-and whether they originate from a primary mantle source or from recycling of surface materials are still debated. Calcium isotopes have the potential to resolve the origin of carbonatites, since marine carbonates are enriched in the lighter isotopes of Ca compared to the mantle. Here, we report the Ca isotopic compositions for 74 carbonatites and associated silicate rocks from continental and oceanic settings, spanning from 3 billion years ago to the present day, together with O and C isotopic ratios for 37 samples. Calcium-, Mg-, and Fe-rich carbonatites have isotopically lighter Ca than mantle-derived rocks such as basalts and fall within the range of isotopically light Ca from ancient marine carbonates. This signature reflects the composition of the source, which is isotopically light and is consistent with recycling of surface carbonate materials into the mantle.

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