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Onion-like carbon in impact diamonds from the Popigai astrobleme

Tatyana Shumilova, Viktoria K. Kis, Viktor Masaitis, Sergey Isaenko and Boris Makeev
Onion-like carbon in impact diamonds from the Popigai astrobleme
European Journal of Mineralogy (February 2014) 26 (2): 267-277


Phase composition and nanostructure of layered and irregular massive impact diamond grains from the Popigai astrobleme have been investigated by Raman spectroscopy and high-resolution electron microscopy and the conditions of phase transformations are discussed. Several coexisting carbon phases forming tight aggregates have been found, including cubic and hexagonal diamond polymorphs, graphite, amorphous carbon, fullerene-like/onion-like carbon. The latter is described within impact diamonds for the first time. It is proposed that the formation of onion-like carbon, in both layered and massive impact diamond grains, is connected with high-pressure graphite transformation or post-pressure stress cooling which causes the partial back transformation of diamond nanocrystallites to sp (super 2) carbon. However, a possible relict origin of the fullerene-like carbon from the impacted initial sedimentary rocks with fullerenes and fullerene-like substances, like shungite or coal, can not be excluded. The difference between micro- and nanostructures of layered and irregular massive impact grains is presented.

ISSN: 0935-1221
EISSN: 1617-4011
Serial Title: European Journal of Mineralogy
Serial Volume: 26
Serial Issue: 2
Title: Onion-like carbon in impact diamonds from the Popigai astrobleme
Affiliation: Russian Academy of Sciences, Institute of Geology of Komi Science Center, Syktyvkar, Russian Federation
Pages: 267-277
Published: 201402
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Germany
References: 52
Accession Number: 2014-028705
Categories: Mineralogy of non-silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 1 table
N71°39'00" - N71°39'00", E111°10'60" - E111°10'60"
Secondary Affiliation: Institute of Technical Physics and Materials Science, HUN, HungaryA. P. Karpinsky Russian Geological Research Institute, RUS, Russian Federation
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, copyright, Schweizerbart'sche Verlagsbuchhandlung. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201418
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