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Russian Geology and Geophysics

2022 year, number 3


T.V. Kedrova1, I.N. Bogush1, N.N. Zinchuk1, L.D. Bardukhinov1, A.N. Lipashova1, V.P. Afanasiev2
1PAO ALROSA, Chernyshevskoe sh. 16, Mirny, 678170, Russia
2V.S. Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences, pr. Akademika Koptyuga 3, Novosibirsk, 630090, Russia
Keywords: Diamonds, placers, Nakyn kimberlite field


The paper presents the results of studies of diamonds from Early Jurassic sediments making up the Nyurbinskoe buried placer of the Nakyn kimberlite field, unique in diamond reserves. The main task was to identify the patterns of diamond distribution in the deposits of the Dyakhtar strata (lower deposit) and the Ukugut Formation (upper deposit) within the placer. A comparative analysis of the typomorphic features of diamonds from the upper and lower deposits of the placer was carried out. Variations in the contents of crystals with certain properties that form the image of a diamond-bearing geologic object have been revealed. The zonal distribution of diamonds by characteristics in sedimentary deposits, regardless of their age, has been established. The properties of diamonds and their associations change within the placer, which is due to their redeposition during the Early Jurassic sedimentation.