Articles | Volume 34, issue 6
Research article
 | Highlight paper
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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Cited articles

Angel, R. J. and Nestola, F.: A century of mineral structures: How well do we know them?, Am. Mineral., 101, 1036–1045,, 2016. 
Ashchepkov, I. V., Kuligin, S. S., Vladykin, N. V., Downes, H., Vavilov, M. A., Nigmatulina, E. N., Babushkina, S. A., Tychkov, N. S., and Khmelnikova, O. S.: Comparison of mantle lithosphere beneath early Triassic kimberlite fields in Siberian craton reconstructed from deep-seated xenocrysts, Geosci. Front., 7, 639–662,, 2016. 
Aulbach, S. and Stachel, T.: Evidence for oxygen-conserving diamond formation in redox-buffered subducted oceanic crust sampled as eclogite, Nat. Commun., 13, 1924,, 2022. 
Aulbach, S. and Stagno, V.: Evidence for a reducing Archean ambient mantle and its effects on the carbon cycle, Geology, 44, 751–754,, 2016. 
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.