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RMS Annual Session combined with the Fedorov Session 2014
Saint Petersburg, Russia
7-9 October 2014
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Redox mechanism of diamond formation at the interaction of subducted carbonates with metal-saturated rocks of the lithospheric mantle

RMS-DPI code:  2014-1-68-0
Scientific session:  M3. MIneralogy ad geochemistry of diamond deposits
Author listing:  Palyanov Yu.N., Bataleva Y.V., Sokol A.G.
Principal author:  Palyanov Yuri Nikolaevich
Language:  Russian
Abstract - Summary 
(short description):
Experiments on the interaction of Mg, Ca-carbonate and iron, modeling processes at the contact of oxidized subducted material and reduced mantle rocks, were performed. Found that due to the ƒO2 gradient in experiments a redox front is formed. Behind the front, under oxidizing conditions, generation of carbonate melt, enriched in Ca, occurs, which is both the crystallization medium and carbon source of diamonds with high nitrogen (1000-1500 ppm) content. Ahead of the front, under reducing conditions, diamond synthesis realizes only in Fe-C melt, and the resulting diamond is characterized by a low content of nitrogen (100-200 ppm). Thus, diamonds, which common source of carbon is carbonate, is found to be significantly different in composition of inclusions, isotope ratios of carbon and nitrogen content, and allow understanding the nature of the heterogeneity and diversity of diamonds in the Earth\'s mantle.
 
Date of presentation:  08/10/2014
Presentation Place:  Mining University, Hall 4312
 
RMS-DPI code:  2014-1-68-0
File of proceedings 
(PDF): 
 234 K
Status:  printed
Accepted:  31/08/2014
Published on-line:  29/12/2015
Permanent address of publication:  http://www.minsoc.ru/2014-1-68-0/
Contact author(s):  Palyanov, Yuri Nikolaevich
 

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