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Fibrous diamonds from the placers of the northeastern Siberian Platform : carbonate and silicate crystallization media

Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.14/163884

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Title: Fibrous diamonds from the placers of the northeastern Siberian Platform : carbonate and silicate crystallization media
Related: Russian geology and geophysics, Vol. 52, Issue 11, (2011), p.1298-1309
DOI: 10.1016/j.rgg.2011.10.003
Publisher: Elsevier BV
Date: 2011
Author/Creator: Zedgenizov, D. A
Author/Creator: Ragozin, A. L
Author/Creator: Shatsky, V. S
Author/Creator: Araujo, Debora
Author/Creator: Griffin, William L
Description: 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 geochemi cal 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.
Description: 12 page(s)
Subject Keyword: Carbon isotope composition
Subject Keyword: Diamond
Subject Keyword: Fluid
Subject Keyword: Melt
Subject Keyword: Microinclusions
Resource Type: journal article
Organisation: Macquarie University. National Key Centre for Geochemical Evolution and Metallogeny of Continents (GEMOC)

Identifier: http://hdl.handle.net/1959.14/163884
Identifier: ISSN:1068-7971
Identifier: mq_res-ext-2-s2.0-80455156312
Language: eng
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