Abstract
A great number of publications are devoted to inclusions in natural diamonds, because these data allow us to reconstruct the crystallization conditions of diamonds at a great depth and to obtain unique information on deep geologic processes as a whole. The main attention of researchers has been focused on perfect octahedral diamond crystals, whereas inclusions of diamond crystals of cubic habit (hereafter, cubic diamonds) remained poorly studied for many years. This was caused by a low transparency of most cubic crystals, their micrometer size, and the presence of heterogeneous inclusions. These attributes substantially complicate the traditional study with an electron microprobe [1]. Recent investigations of cubic diamond crystals from various deposits all over the world have shown that they contain many unusual melt or fluid microinclusions of complex carbonatite composition [1‐4]. Melt sulfide microinclusions were revealed in cubic diamond crystals from the Yakutian deposits [3]. However, the published information on the composition of specific mineral phases contained in cubic diamond crystals as inclusions remains scanty. Analytic electron microscopy is a very efficient method of studying microinclusions incorporated into translucent crystals. This method is a combination of transmission and scanning electron microscopy with energy-dispersive analysis. We used this method to study mineral inclusions in imperfect translucent diamond crystals of various types [5 and references therein]. In particular, the inclusions in a few cubic crystals from deposits in northern China were investigated with this method [6, 7]. The aim of this study was to use analytical electron microscopy for the examination the mineral microinclusions in cubic diamond crystals from deposits in the Siberian Craton. In the course of this study, we examined whitish gray crystals from the Yubileinaya kimberlite pipe (samples 1 and 2), gray and greenish yellow crystals from the Aikhal pipe (samples 3 and 4), black crystals
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