Polák, Ladislav, Ackerman, Lukáš, Magna, Tomáš, Rapprich, Vladislav, Bizimis, Michael, Giebel, Robert Johannes, Dahlgren, Sven, Čejková, Bohuslava and Béguelin, Paul
2026.
Neodymium isotope constraints from global carbonatites on the possible presence of a long-lived enriched mantle reservoir.
Lithos: Journal of Petrology, Mineralogy and Geochemistry
538-53
, 108599.
10.1016/j.lithos.2026.108599
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Abstract
The occurrence of mantle-derived carbonatites in the geologic record since ∼3 billion years ago (Ga) allows to track the evolution of carbon-bearing mantle sources throughout much of the Earth's history. There appears to be continuing evidence for a significant proportion of subducted marine sedimentary material into the mantle sources of many carbonatites, attested by large ranges in εSr(i) from 7 to 73 and in εNd(i) from −10 to +0.5 which is different to conventional carbonatites originating from asthenospheric mantle with a limited contribution from enriched mantle sources; yet, neither sedimentary recycling via subduction nor common mantle metasomatism can explain highly unradiogenic and correlated initial 143Nd/144Nd ratios with εNd(i) values as low as −18.3, observed in many worldwide carbonatites with emplacement ages ranging from ∼2.0 Ga to 30 Ma. Here, we argue that these carbonatites require derivation from a long-lived mantle reservoir characterized by low-Sm/Nd (<0.17). These signatures can be best explained by admixture of an ancient, low-Sm/Nd slab-derived component that must have been incorporated into the mantle source parental to these low-143Nd/144Nd carbonatites at least 2.7 billion years ago.
| Item Type: | Article |
|---|---|
| Date Type: | Publication |
| Status: | Published |
| Schools: | Schools > Earth and Environmental Sciences |
| Additional Information: | RRS policy applied |
| Publisher: | Elsevier |
| ISSN: | 0024-4937 |
| Date of First Compliant Deposit: | 9 June 2026 |
| Date of Acceptance: | 7 May 2026 |
| Last Modified: | 02 Aug 2026 07:45 |
| URI: | https://orca.cardiff.ac.uk/id/eprint/187062 |
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