Nanodiamond Formation at the Lithogenesis and Low-Stages of Regional Metamorphism

Samples of gilsonite from Adzharia, anthraxolite and graphite of coal from Taimyr, shungite from Karelia, and anthracite from Donbass are studied using Raman spectroscopy. Peaks at 1600 cm −1 , indicating the presence of nanographite, are recorded in all samples. The anthracite sample from Donbass,...

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Bibliographic Details
Published in:Doklady earth sciences 2018-02, Vol.478 (2), p.214-218
Main Authors: Simakov, S. K., Melnik, N. N., Vyalov, V. I.
Format: Article
Language:English
Subjects:
Analytical methods
Anthracite
Diamonds
Earth and Environmental Science
Earth Sciences
Geochemistry
Graphite
Lithogenesis
Metamorphic rocks
Metamorphism
Metamorphism (Geology)
Nanostructure
Raman spectroscopy
Schist
Schists
Spectroscopy
Zeolites
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Summary:Samples of gilsonite from Adzharia, anthraxolite and graphite of coal from Taimyr, shungite from Karelia, and anthracite from Donbass are studied using Raman spectroscopy. Peaks at 1600 cm −1 , indicating the presence of nanographite, are recorded in all samples. The anthracite sample from Donbass, 1330 cm −1 , corresponds to the sp 3 -line of carbon hybridization conforming to a nanodiamond. It is concluded that in nature diamonds can be formed at late stages of lithogenesis (catagensis, metagenesis), and for coals, it can occur at the zeolite stage of regional metamorphism of rocks, before the green schist stage.
ISSN:1028-334X
1531-8354
DOI:10.1134/S1028334X18020095