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Some specific features of genesis of microdiamonds of octahedral and cubic habit from kimberlites of the Udachnaya Pipe (Yakutia) inferred from carbon isotopes and main impurity defects

V. N. Reutsky and D. A. Zedgenizov
Some specific features of genesis of microdiamonds of octahedral and cubic habit from kimberlites of the Udachnaya Pipe (Yakutia) inferred from carbon isotopes and main impurity defects
Russian Geology and Geophysics (March 2007) 48 (3): 299-304

Abstract

Microdiamonds (crystals smaller than 1 mm) of octahedral and cubic habit from Udachnaya kimberlite pipe (Yakutia) have been compared in order to distinguish genetic features inferred from carbon isotopic composition and impurity defects. Microdiamonds of cubic habit from the Udachnaya kimberlite pipe have a fibrous internal structure and a high content of nitrogen impurity (400-3000 ppm). Octahedral microdiamonds from the same deposit are distinguished by a low nitrogen content of 0 to 500 ppm and zoning structure. The isotopic composition of carbon (delta (super 13) C is -4.7 ppm for octahedra and -4.5 ppm for cuboids) suggests a common source of carbon for these morphologic groups. The studied characteristics can be due to crystallization of octahedra from carbon dissolved in the melt, and cuboids, under the conditions of the hampered diffusion of carbon.


ISSN: 1068-7971
Serial Title: Russian Geology and Geophysics
Serial Volume: 48
Serial Issue: 3
Title: Some specific features of genesis of microdiamonds of octahedral and cubic habit from kimberlites of the Udachnaya Pipe (Yakutia) inferred from carbon isotopes and main impurity defects
Affiliation: Russian Academy of Sciences, Siberian Division, V. Sobolev Institute of Geology and Mineralogy, Novosibirsk, Russian Federation
Pages: 299-304
Published: 200703
Text Language: English
Publisher: Allerton Press, New York, NY, United States
Accession Number: 2019-005477
Categories: Mineralogy of non-silicates
Document Type: Serial
Bibliographic Level: Analytic
Annotation: Based on Publisher-supplied data
N66°25'60" - N66°25'60", E112°19'00" - E112°19'00"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2019, American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands
Update Code: 201906
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