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Crystallogenesis and Mineralogy
Saint Petersburg, Russia
1-5 October 2007
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Conferences & Meetings 2nd International Conference "Crystallogenesis and Mineralogy"
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Nanometre-sized mineral and fluid inclusions in Yakutian diamonds: In a new way

RMS-DPI code:  2007-1-174-0
Scientific session:  Session 6. Nanophases and nanoprocesses
Author listing:  Logvinova A.M., Wirth R., Sobolev N.V.
Principal author:  Louvinova Alla Mikhailovna
Language:  Russian
Abstract - Summary 
(short description):
Nanometric-sized isolated inclusions have been studied in six cloudy octahedral diamonds from Internationalnaya and Yubileynaya mines (Yakutia). Transmission electron microscopy (TEM) techniques such as electron diffraction, AEM, EELS and HREM were applied. All crystals exhibit octahedral external habit with cloudy cores which contain numerous micro- and nanoinclusions, each of them is composed of multi-phase assemblages, which include solid phases (silicates, oxides, carbonates), brines (halides) and fluid bubbles. All inclusions are relatively homogenous in composition and contain the distinguishable crystalline and fluid phases. Al-bearing highMg silicate, Ca,Mg-carbonates, Ba-carbonate, Sr-carbonate, phlogopite, ilmenite, apatite, magnetite, K,Fe-sulfides and kyanite have been identified as crystalline mineral phases by electron diffraction patterns, except of Ba and Sr-carbonate. Halide phase is KCl. Bubbles contained high K, Cl, O, F, P and less S, Ba, Si, Ti components. Carbonates were identified in TEM foils from all studied diamonds in all assemblages with silicates, oxides, sulfides. Some elemental variations may be explained by fractional crystallization of such fluid/melt or mixing of fluids with different compositions (carbonatitic, hydrous-silicic, brines).
 
RMS-DPI code:  2007-1-174-0
Proceeedings volume 
in the RMS catalogue:
 
Crystallogenesis and Mineralogy
Pages:  394-396
File of proceedings 
(PDF): 
 255 K
Status:  printed
Accepted:  07/05/2007
Published on-line:  06/01/2008
Permanent address of publication:  http://www.minsoc.ru/2007-1-174-0/
Contact author(s):  Logvinova, Alla Mikhailovna
 

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