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Influence of the Sulfur Concentration in a Fe–S Melt on Diamond Preservation under P–T Conditions of the Earth’s Mantle

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Abstract

The results of experiments on dissolution of diamond in a Fe melt with variable concentrations of S at high P–T parameters are presented. It is established that the maximal degree of diamond dissolution occurs at a sulfur concentration of 15 wt %. With decreasing or increasing S content, dissolution of diamond slows down and almost does not occur during the period of the experiment (60 min), when the “eutectic” composition is gained. In contrast to a pure Fe melt, the presence of S decreases the carbon solubility and, therefore, reduces the aggressiveness of metal melt in relation to diamonds, thus, stimulating their preservation in the Earth’s mantle, especially if the concentration of S exceeds that in the “eutectic” composition.

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Authors and Affiliations

  1. Sobolev Institute of Geology and Mineralogy, Siberian Branch, Russian Academy of Sciences, Novosibirsk, 630090, Russia

    V. M. Sonin, E. I. Zhimulev, A. A. Chepurov, A. I. Chepurov & N. P. Pokhilenko

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  1. V. M. Sonin
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  2. E. I. Zhimulev
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  3. A. A. Chepurov
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  4. A. I. Chepurov
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  5. N. P. Pokhilenko
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Correspondence to V. M. Sonin.

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Original Russian Text © V.M. Sonin, E.I. Zhimulev, A.A. Chepurov, A.I. Chepurov, N.P. Pokhilenko, 2018, published in Doklady Akademii Nauk, 2018, Vol. 481, No. 2.

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Sonin, V.M., Zhimulev, E.I., Chepurov, A.A. et al. Influence of the Sulfur Concentration in a Fe–S Melt on Diamond Preservation under P–T Conditions of the Earth’s Mantle. Dokl. Earth Sc. 481, 922–924 (2018). https://doi.org/10.1134/S1028334X1807019X

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  • DOI: https://doi.org/10.1134/S1028334X1807019X

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