The Compositional Peculiarities of Microinclusions in Diamonds from the Lomonosov Deposit (Arkhangelsk Province)

— The data on the composition of microinclusions in diamonds from the Lomonosov deposits are reported for the first time. The studied diamonds include “coated” ( n = 5) and cubic ( n = 5) crystals. The estimated range of the degree of nitrogen aggregation in diamonds (4–39% B1) does not support thei...

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Bibliographic Details
Published in:Geochemistry international 2019-09, Vol.57 (9), p.973-980
Main Authors: Kriulina, G. Yu, Iskrina, A. V., Zedgenizov, D. A., Bobrov, A. V., Garanin, V. K.
Format: Article
Language:English
Subjects:
Aggregation
Biotite
Composition
Crystals
Diamond films
Diamond mining
Diamonds
Earth and Environmental Science
Earth Sciences
Geochemistry
High temperature
Kimberlite
Magma
Magmatism
Phosphorus pentoxide
Silicates
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Summary:— The data on the composition of microinclusions in diamonds from the Lomonosov deposits are reported for the first time. The studied diamonds include “coated” ( n = 5) and cubic ( n = 5) crystals. The estimated range of the degree of nitrogen aggregation in diamonds (4–39% B1) does not support their direct links with kimberlite magmatism; however, their short occurrence in the mantle at higher temperatures is probable as well. The composition of melt/fluid microinclusions in these samples varies from essentially carbonatitic to significantly silicate. It is shown that the contents of MgO, CaO, Na 2 O, Cl, and P 2 O 5 decrease with increasing content of silicates and water. Different mechanisms of the generation and evolution of diamond-forming media are discussed to explain the observed variations.
ISSN:0016-7029
1556-1968
DOI:10.1134/S0016702919090052