Radial Mosaic Internal Structure of Rounded Diamond Crystals from Alluvial Placers of Siberian platform | Sciact - CRIS-system of Boreskov Institute of Catalysis

Radial Mosaic Internal Structure of Rounded Diamond Crystals from Alluvial Placers of Siberian platform Full article

Journal

Mineralogy and Petrology
ISSN: 0930-0708 , E-ISSN: 1438-1168

Output data

Year: 2016, Volume: 110, Number: 6, Pages: 861-875 Pages count : 15 DOI: 10.1007/s00710-016-0456-0

Tags

Diamond; Diffraction of backscattered electrons; Internal structure; Radial mosaic pattern; Splitting; X-ray topography

Authors

Ragozin A.L. ^1,2 , Zedgenizov D.A. ^1,2 , Kuper K.E. ³ , Shatsky V.S. ^1,2,4

Affiliations

1	V.S. Sobolev Institute of Geology and Mineralogy, Siberian Branch Russian Academy of Sciences, Novosibirsk, Russia
2	Novosibirsk State University, Novosibirsk, Russia
3	Budker Institute of Nuclear Physics, Siberian Branch Russian Academy of Sciences, Novosibirsk, Russia
4	A.P. Vinogradov Institute of Geochemistry, Siberian Branch Russian Academy of Sciences, Irkutsk, Russia

The specific gray to almost black diamonds of rounded morphology are especially typical in alluvial placers of the northeastern part of the Siberian platform. The results of study of internal structure of these diamonds are presented. X-ray topography and birefringence patterns of polished plates of studied diamonds show their radial mosaic structure. Diamonds consists of slightly misorientated (up to 20′) subindividuals which are combined to mosaic wedge-shaped sectors. Electron back-scatter diffraction technique has demonstrated that subindividuals are often combined in the single large blocks (subgrains). The whole crystals commonly consist of several large subgrains misoriented up to 5° to one another. The total nitrogen content of these diamonds vary in the range 900–3300 ppm and nitrogen aggregation state (NB/(NB + NA)*100) from 25 to 64 %. Rounded diamond crystals of variety V are suggested to have been formed at the high growth rate caused by the high oversaturation of carbon in the crystallization medium. It may result in the splitting of growing crystal and their radial mosaic structure as a sequence. High content of structural nitrogen defects and the great number of mechanical impurities – various mineral and fluid inclusions may also favor to generation of this structure.

Ragozin A.L. , Zedgenizov D.A. , Kuper K.E. , Shatsky V.S.
Radial Mosaic Internal Structure of Rounded Diamond Crystals from Alluvial Placers of Siberian platform
Mineralogy and Petrology. 2016. V.110. N6. P.861-875. DOI: 10.1007/s00710-016-0456-0 WOS Scopus РИНЦ ANCAN OpenAlex

Submitted:	Feb 26, 2016
Accepted:	Jul 13, 2016
Published online:	Jul 25, 2016
Published print:	Dec 1, 2016

Web of science:	WOS:000388834300010
Scopus:	2-s2.0-84979561651
Elibrary:	29464932
Chemical Abstracts:	2016:1221844
Chemical Abstracts (print):	169:204004
OpenAlex:	W2486755499

DB	Citing
Web of science	15
Scopus	16
OpenAlex	16