Fibrous diamonds from the placers of the northeastern Siberian Platform

Carbonate and silicate crystallization media

D. A. Zedgenizov*, A. L. Ragozin, V. S. Shatsky, D. Araujo, W. L. Griffin

*Corresponding author for this work

Research output: Contribution to journalArticle

50 Citations (Scopus)

Abstract

The first data are presented on the compositions of microinclusions in fibrous diamonds from the Ebelyakh placers, northeastern Siberian Platform. Their fluid/melt microinclusions are of silicate or carbonate compositions. In general, the trace element patterns for the microinclusions correspond to kimberlites and carbonatites. The major-element composition differs significantly; for example, the microinclusions are considerably enriched in K and Na. In two of the studied diamonds, the microinclusion compositions differ considerably in the cores and rims. In one of them, the composition of the medium changes from chloride-carbonate to predominantly carbonate (sample HI-90); in the other one, from carbonate to silicate (sample HI-98). Similar carbon isotope characteristics of diamonds with microinclusions of two contrasting media might suggest their crystallization from a mantle reservoir with the same carbon isotope characteristics. The geochemical features of the microinclusions in the placer diamonds revealed their relationship with protokimberlitic carbonate-silicate fluids. Such fluids might result from the metasomatic interaction of volatiles and/or the low-degree partial melting of peridotite and eclogite substrates.

Original languageEnglish
Pages (from-to)1298-1309
Number of pages12
JournalRussian Geology and Geophysics
Volume52
Issue number11
DOIs
Publication statusPublished - Nov 2011

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