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Nanometre-sized mineral and fluid inclusions in cloudy Siberian diamonds; new insights on diamond formation

Alla M. Logvinova, Richard Wirth, Ekaterina N. Fedorova and Nikolai V. Sobolev
Nanometre-sized mineral and fluid inclusions in cloudy Siberian diamonds; new insights on diamond formation (in Diamonds, Makoto Arima (editor), Ben Harte (editor) and Nikolay V. Sobolev (editor))
European Journal of Mineralogy (June 2008) 20 (3): 317-331


Nanometre-sized isolated inclusions have been studied in four cloudy octahedral diamonds from the Internatsionalnaya and one from the Yubileynaya mines (Yakutia). Transmission electron microscopy (TEM) techniques such as electron diffraction, analytical electron microscopy (AEM), electron energy-loss spectroscopy (EELS) and high-resolution electron microscopy (HREM) were applied as well as line scan and elemental mapping of the samples. All crystals exhibit octahedral external habit with opaque central cuboid cores that contain numerous nano-inclusions. All nano-inclusions in the size range between 30 and 800 nm reflect the diamond habit and are considered primary, syngenetic to host diamond. They are composed of multi-phase assemblages, which include solid phases (silicates, oxides, carbonates), brines (halides), and fluid bubbles. These inclusions are relatively homogeneous in composition and contain distinguishable crystalline and fluid phases. Al-bearing high-Mg silicate, dolomite, Ba-Sr carbonate, phlogopite, ilmenite, ferropericlase, apatite, magnetite, K-Fe sulfides (djerfisherite?) and kyanite have been identified as crystalline mineral phases by electron diffraction patterns, except the Ba-Sr carbonate. Several phases, including CaF (sub 2) and clinohumite-like phases, have never been reported as inclusions in diamond. The halide phase was KCl. Bubbles contained high K, Cl, O, P and less S, Ba, Si, Ti components. Carbonates were identified in TEM foils from all studied diamonds. They occur in all assemblages with silicates, oxides, and sulfides and show a general enrichment in incompatible elements such as Sr and Ba. Some elemental variations may be explained by fractional crystallization of fluid/melt or mixing of fluids with different compositions (carbonatitic, hydrous-silicic, brines).

ISSN: 0935-1221
EISSN: 1617-4011
Serial Title: European Journal of Mineralogy
Serial Volume: 20
Serial Issue: 3
Title: Nanometre-sized mineral and fluid inclusions in cloudy Siberian diamonds; new insights on diamond formation
Title: Diamonds
Author(s): Logvinova, Alla M.Wirth, RichardFedorova, Ekaterina N.Sobolev, Nikolai V.
Author(s): Arima, Makotoeditor
Author(s): Harte, Beneditor
Author(s): Sobolev, Nikolay V.editor
Affiliation: Russian Academy of Sciences, Siberian Branch, Institute of Geology and Mineralogy, Novosibirsk, Russian Federation
Pages: 317-331
Published: 200806
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Federal Republic of Germany
References: 73
Accession Number: 2008-111806
Categories: Economic geology, geology of nonmetal depositsMineralogy of non-silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 2 tables
N55°00'00" - N73°00'00", E108°00'00" - E162°00'00"
Secondary Affiliation: GeoForschungsZentrum Potsdam, DEU, Federal Republic of Germany
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, copyright, Schweizerbart'sche Verlagsbuchhandlung. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 200841
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