Homogenization of carbonate-bearing microinclusions in diamond at PT parameters of the upper mantle


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The staged high-pressure annealing of natural cubic diamonds with numerous melt microinclusions from the Internatsional’naya kimberlite pipe was studied experimentally. The results mainly show that the carbonate phases, the daughter phases in partially crystallized microinclusions in diamonds, may undergo phase transformations under the mantle PT conditions. Most likely, partial melting and further dissolution of dolomite in the carbonate–silicate melt (homogenization of inclusions) occur in inclusions. The experimental data on the staged high-pressure annealing of diamonds with melt microinclusions allow us to estimate the temperature of their homogenization as 1400–1500°C. Thus, cubic diamonds from the Internatsional’naya pipe could have been formed under quite high temperatures corresponding to the lithosphere/asthenosphere boundary. However, it should be noted that the effect of selective capture of inclusions with partial loss of volatiles in relation to the composition of the crystallization medium is not excluded during the growth. This may increase the temperature of their homogenization significantly between 1400 and 1500°C.

Sobre autores

A. Ragozin

Sobolev Institute of Geology and Mineralogy, Siberian Branch; Novosibirsk State University

Autor responsável pela correspondência
Email: ragoz@igm.nsc.ru
Rússia, Akad Koptyuga pr. 3, Novosibirsk, 630090; Novosibirsk

Yu. Palyanov

Sobolev Institute of Geology and Mineralogy, Siberian Branch; Novosibirsk State University

Email: ragoz@igm.nsc.ru
Rússia, Akad Koptyuga pr. 3, Novosibirsk, 630090; Novosibirsk

D. Zedgenizov

Sobolev Institute of Geology and Mineralogy, Siberian Branch; Novosibirsk State University

Email: ragoz@igm.nsc.ru
Rússia, Akad Koptyuga pr. 3, Novosibirsk, 630090; Novosibirsk

A. Kalinin

Sobolev Institute of Geology and Mineralogy, Siberian Branch; Novosibirsk State University

Email: ragoz@igm.nsc.ru
Rússia, Akad Koptyuga pr. 3, Novosibirsk, 630090; Novosibirsk

V. Shatsky

Sobolev Institute of Geology and Mineralogy, Siberian Branch; Novosibirsk State University; Vinogradov Institute of Geochemistry, Siberian Branch

Email: ragoz@igm.nsc.ru
Rússia, Akad Koptyuga pr. 3, Novosibirsk, 630090; Novosibirsk; ul. Favorskogo 1a, Irkutsk, 650033

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