The paper addresses a fluid phase conserved in inclusions in diamond, which were synthesized in the metal–carbon system in the presence of silicate material at 5.5 GPa and 1500°C. Natural olivine and alkaline basaltic glass were used as silicate material. It was found that the diamonds contain 130 different volatile compounds dominated by medium (С5–С12) and heavy (С13–С18) aliphatic hydrocarbons, which correspond to the presence of a highly reducing fluid in the crystallization medium. The comparison of obtained data with composition of fluid inclusions, which were found in natural diamonds and contain significant amount of medium and heavy aliphatic hydrocarbons of the С5–С18 series, indicates that some natural diamonds could be formed in highly reducing mantle conditions in the presence of metal liquids.
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We are grateful to A.V. Bobrov for his invitation to this special issue. Two anonymous reviewers are thanked for useful critical comments.
Microimages of diamond crystals were obtained using Nanostructure Center for Collective Use.
Gas chromatography–mass spectrometry studies were made with financial support of the Russian Science Foundation (project no. 19-17-00128). Raman spectroscopy of phases was conducted in the framework of the Russian Foundation for Basic Research (project no. 18–05–00761).
Translated by M. Bogina
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Tomilenko, A.A., Chepurov, A.A., Sonin, V.M. et al. Composition of Volatiles Captured by Diamonds during Growth in the Metal–Carbon–Silicate System at High Pressure and High Temperature. Geochem. Int. 59, 840–850 (2021). https://doi.org/10.1134/S0016702921080085
- high pressure
- high temperature
- gas chromatogramphy–mass spectrometry