Calcium isotopic evidence for the mantle sources of carbonatites - INSU - Institut national des sciences de l'Univers Access content directly
Journal Articles Science Advances Year : 2020

Calcium isotopic evidence for the mantle sources of carbonatites

Abstract

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 0 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
Fichier principal
Vignette du fichier
eaba3269.full.pdf (755.75 Ko) Télécharger le fichier
Origin : Publication funded by an institution
Loading...

Dates and versions

insu-02916256 , version 1 (18-08-2020)

Licence

Attribution - NoDerivatives

Identifiers

Cite

Elsa Amsellem, Frédéric Moynier, Hervé Bertrand, Amaury Bouyon, João Mata, et al.. Calcium isotopic evidence for the mantle sources of carbonatites. Science Advances , 2020, 6 (23), pp.eaba3269. ⟨10.1126/sciadv.aba3269⟩. ⟨insu-02916256⟩
146 View
77 Download

Altmetric

Share

Gmail Facebook Twitter LinkedIn More