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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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Mineralogy of diamonds from placers of Northern-Eastern Siberian platform

RMS-DPI code:  2007-1-146-0
Scientific session:  Session 5. Crystal chemistry and crystal morphology of minerals
Author listing:  Ragozin A.L., Shatsky V.S., Zedgenizov D.A.
Principal author:  Ragozin Alexey L'vovich
Language:  Russian
Abstract - Summary 
(short description):
Mineralogy and genesis features of diamonds from placers of NE of Siberian platform has been described in this study. In comparison with others some of studied crystals are unique in terms of carbon isotopic composition and nitrogen content. There is the limiting sector, which reflects the evolution of mantle melt or fluid during differentiation. The data points of rounded diamonds from placers of the northeastern Siberian Platform are plotted far beyond this sector, thus indicating their unusual source. The studied diamonds are enriched in nitrogen (up to 2600 ppm), have a light carbon isotopic composition and contain coesite inclusions. Taking into account these facts, one can assume with a high probability that diamonds from placers of the northeastern Siberian Platform crystallized in subducted crustal rocks. The high degree of nitrogen aggregation based on kinetic models indicates that diamonds remained under upper mantle conditions for a long time after crystallization.
 
RMS-DPI code:  2007-1-146-0
Proceeedings volume 
in the RMS catalogue:
 
Crystallogenesis and Mineralogy
Pages:  328-331
File of proceedings 
(PDF): 
 325 K
Status:  printed
Accepted:  07/05/2007
Published on-line:  06/01/2008
Permanent address of publication:  http://www.minsoc.ru/2007-1-146-0/
Contact author(s):  Ragozin, Alexey L'vovich
 

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