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The first finding of graphite inclusion in diamond from mantle rocks: The result of the study of eclogite xenolith from Udachnaya pipe (Siberian craton)

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Abstract

A xenolith of eclogite from the kimberlite pipe Udachnaya–East, Yakutia Grt+Cpx+Ky + S + Coe/Qtz + Dia + Gr has been studied. Graphite inclusions in diamond have been studied in detail by Confocal Raman (CR) mapping. The graphite inclusion in diamond has a highly ordered structure and is characterized by a substantial shift in the band (about 1580 cm–1) by 7 cm–1, indicating a significant residual strain in the inclusion. According to the results of FTIR spectroscopic studies of diamond crystals, a high degree of nitrogen aggregation has been detected: it is present mainly in form A, which means an “ancient” age of the diamonds. In the xenolith studied, the diamond formation occurred about 1 Byr, long before their transport by the kimberlite melt, and the conditions of the final equilibrium were temperatures of 1020 ± 40°C at 4.7 GPa. Thus, these graphite inclusions found in a diamond are the first evidence of crystallization of metastable graphite in a diamond stability field. They were formed in rocks of the upper mantle significantly below (≥20 km) the graphite-diamond equilibrium line.

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Authors and Affiliations

  1. Sobolev Institute of Geology and Mineralogy, Siberian Branch, Russian Academy of Sciences, pr. Akad. Koptyuga 3, Novosibirsk, 119037, Russia

    D. S. Mikhailenko, A. V. Korsakov, A. V. Golovin & N. P. Pohilenko

  2. Novosibirsk State University, Novosibirsk, Russia

    A. V. Korsakov, A. V. Golovin & N. P. Pohilenko

  3. Institute of Natural Sciences, Ural Federal University, Yekaterinburg, Russia

    P. S. Zelenovskiy

Authors
  1. D. S. Mikhailenko
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  2. A. V. Korsakov
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  3. A. V. Golovin
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  4. P. S. Zelenovskiy
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  5. N. P. Pohilenko
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Correspondence to D. S. Mikhailenko.

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Original Russian Text © D.S. Mikhailenko, A.V. Korsakov, A.V. Golovin, P.S. Zelenovskiy, N.P. Pohilenko, 2016, published in Doklady Akademii Nauk, 2016, Vol. 469, No. 6, pp. 717–720.

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Mikhailenko, D.S., Korsakov, A.V., Golovin, A.V. et al. The first finding of graphite inclusion in diamond from mantle rocks: The result of the study of eclogite xenolith from Udachnaya pipe (Siberian craton). Dokl. Earth Sc. 469, 870–873 (2016). https://doi.org/10.1134/S1028334X16080250

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  • DOI: https://doi.org/10.1134/S1028334X16080250

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