IMPURITIES AND CARBON ISOTOPE COMPOSITIONS OF MICRODIAMONDS WITH EXTRA FACES FROM THE UDACHNAYA KIMBERLITE PIPE
D.A. Zedgenizov, V.N. Reutsky, V.S. Shatsky, and E.N. Fedorova
Institute of Mineralogy and Petrography, Siberian Branch of the RAS,
3 prosp. Akad. Koptyuga, Novosibirsk, 630090, Russia
Keywords: Diamond, nitrogen, carbon isotope composition
Pages: 834-841
Abstract
Microdiamonds with extra faces from the Udachnaya kimberlite pipe have no morphologic analogs among the known microdiamonds. The cause of the appearance of such faces on octahedral microdiamonds is still obscure. The results obtained in this study shed light upon the defect-impurity and carbon isotope compositions of the Udachnaya microdiamonds with additional faces. Predominant nitrogen defects in the diamond structure are A and B1. Most of the microcrystals contain hydrogen impurities as well. A specific feature of these microdiamonds is low concentration and significant aggregation of nitrogen defects. The obtained values of  13C vary from -2.76 to -7.16 |
