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Chromatographic study of formation conditions of rhombododecahedral diamond crystals

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Abstract

The results of chromatographic study of the formation of rhombododecahedral diamonds synthesized in the Fe-Ni-(Ti)-C system at 5.5–6.0 GPa and 1350–1450°C are presented, including crystals with rounded surfaces of the rhombododecahedron with parallel striation, which are morphological analogues of natural diamonds abundant at various kimberlite, lamproite, and placer deposits. Chromatography was performed at 150°C with mechanical breakup of diamonds. The stable release of methane when diamonds of habit {110} are crushed is established. It is concluded that the appearance of the habit rhombododecahedron may be related not only to the effect of temperature and pressure on crystal growth but also to reductive conditions of crystallization. At the same time, the appearance of significant amounts of hydrocarbons in the system probably results in stopping of the growth of faces {110} and {100} and, instead, formation of specific surfaces that are composed of microscopic accessories faced by planes {111}.

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Authors and Affiliations

  1. Institute of Geology and Mineralogy, Siberian Branch, Russian Academy of Sciences, pr. Akademika Koptyuga 3, Novosibirsk, 630090, Russia

    E. I. Zhimulev, V. M. Sonin, A. I. Chepurov & A. A. Tomilenko

Authors
  1. E. I. Zhimulev
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  2. V. M. Sonin
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  3. A. I. Chepurov
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  4. A. A. Tomilenko
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Correspondence to V. M. Sonin.

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Original Russian Text © E.I. Zhimulev, V.M. Sonin, A.I. Chepurov, A.A. Tomilenko, 2009, published in Geologiya Rudnykh Mestorozhdenii, 2009, Vol. 51, No. 3, pp. 272–275.

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Zhimulev, E.I., Sonin, V.M., Chepurov, A.I. et al. Chromatographic study of formation conditions of rhombododecahedral diamond crystals. Geol. Ore Deposits 51, 243–246 (2009). https://doi.org/10.1134/S1075701509030064

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  • DOI: https://doi.org/10.1134/S1075701509030064

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