European Journal of Mineralogy
European Journal of Mineralogy
European Journal of Mineralogy
Articles | Volume 34, issue 6
Articles | Volume 34, issue 6
https://doi.org/10.5194/ejm-34-549-2022
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/ejm-34-549-2022
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 34, issue 6
Research article
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15 Nov 2022
Research article | Highlight paper |  | 15 Nov 2022

Relatively oxidized conditions for diamond formation at Udachnaya (Siberia)

Luca Faccincani, Valerio Cerantola, Fabrizio Nestola, Paolo Nimis, Luca Ziberna, Leonardo Pasqualetto, Aleksandr I. Chumakov, Jeffrey W. Harris, and Massimo Coltorti

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Latest update: 05 Nov 2025
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Short summary
We determined the physical conditions at the time of its entrapment for an inclusion pair hosted in a Siberian diamond (Udachnaya kimberlite) and found that it equilibrated under relatively oxidized conditions, near the enstatite–magnesite–olivine–diamond (EMOD) buffer, similarly to Udachnaya xenoliths originating from comparable depths. These results can be reconciled with models suggesting relatively oxidized, water-rich CHO fluids as the most likely parents for lithospheric diamonds.
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