Skip to Main Content
GEOREF RECORD

Structural characteristics of shungite carbon subjected to contact metamorphism overprinted by greenschist-facies regional metamorphism

Svetlana Y. Chazhengina and Vladimir V. Kovalevski
Structural characteristics of shungite carbon subjected to contact metamorphism overprinted by greenschist-facies regional metamorphism (in Geo-Raman X, Jean Dubessy (editor))
European Journal of Mineralogy (December 2013) 25 (5): 835-843

Abstract

Shungite rocks of Karelia (Russia) form a large, diverse group of black sedimentary-volcanic Proterozoic (2.0 Ga) rocks with giant elemental carbon reserves (>25 X 10 (super 10) tonnes). The complex metamorphic history of these rocks and the unusual structural characteristics of shungite carbon have made it the subject of attention and controversy. The structure and microstructure of shungite carbon, subjected to contact metamorphism by intrusive dolerite sills overprinted by greenschist-facies regional metamorphism, were studied by Raman spectroscopy (RS), transmission electron microscopy (TEM), and selected-area electron diffraction (SAED). The RS, TEM and SAED data have revealed the characteristic structural features of shungite acquired during contact metamorphism and eventually preserved despite the subsequent metamorphic event. The microstructure of shungite affected by the most intense metamorphic transformation of all the analysed samples is characterized by hollow nanospheres with diameters of approximately 100 nm and a wall thickness of up to 10 nm ( approximately 30 graphene layers). The maximum degree of structural order in this shungite was recorded by RS study (R2 ca. 0.47) at the contact with the intrusive dolerite sills.


ISSN: 0935-1221
EISSN: 1617-4011
Serial Title: European Journal of Mineralogy
Serial Volume: 25
Serial Issue: 5
Title: Structural characteristics of shungite carbon subjected to contact metamorphism overprinted by greenschist-facies regional metamorphism
Title: Geo-Raman X
Author(s): Chazhengina, Svetlana Y.Kovalevski, Vladimir V.
Author(s): Dubessy, Jeaneditor
Affiliation: Russian Academy of Sciences, Institute of Geology, Petrozavodsk, Russian Federation
Affiliation: Universite de Lorraine, Nancy, France
Pages: 835-843
Published: 201312
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Germany
Meeting name: 10th Geo-Raman meeting
Meeting location: Nancy, FRA, France
Meeting date: 20120611June 11-13, 2012
References: 38
Accession Number: 2014-004523
Categories: Igneous and metamorphic petrology
Document Type: Serial Conference document
Bibliographic Level: Analytic
Illustration Description: illus. incl. 2 tables
N60°40'00" - N66°40'00", E29°19'60" - E37°55'00"
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: 201404
Close Modal

or Create an Account

Close Modal
Close Modal