New Data on Diamond–Graphite Relationships in the Gneisses of the Kokchetav Massif (Northern Kazakhstan)

The results of studying an aggregate of graphite-and-diamond crystal in tourmaline 5 μm of the Kokchetav massif by the method of transmission electron microscopy are presented. The detail studies of the interface between the crystals of graphite and diamond have revealed the absence of disordered gr...

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Published inDoklady earth sciences Vol. 480; no. 2; pp. 814 - 817
Main Authors Mikhailenko, D. S., Shchepetova, O. V., Musiyachenko, K. A., Korsakov, A. V., Ohfuji, Hiroaki, Pekov, I. V.
Format Journal Article
LanguageEnglish
Published Moscow Pleiades Publishing 01.06.2018
Springer
Springer Nature B.V
Subjects
Coexistence
Crystallization
Crystals
Deformation
Diamonds
Earth and Environmental Science
Earth Sciences
Electron microscopy
Geochemistry
Gneiss
Graphite
Graphitization
Kinking
Lithium compounds
Stability
Tourmaline
Transmission electron microscopy
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Summary:The results of studying an aggregate of graphite-and-diamond crystal in tourmaline 5 μm of the Kokchetav massif by the method of transmission electron microscopy are presented. The detail studies of the interface between the crystals of graphite and diamond have revealed the absence of disordered graphite that is detail partially graphitized diamond. Intense deformation changes in the graphite crystal occurred after it was captured by tourmaline at the regression stage, which led to considerable kinking of the graphite crystal along the a-axis. Thus, the coexistence of graphite and diamond crystals cannot be unambiguously interpreted as a product of partial diamond graphitization. Graphite could have crystallized syngenetic with a diamond crystal or at the retrograde stage in the graphite stability field.
ISSN:1028-334X
1531-8354
DOI:10.1134/S1028334X18060272