News Registration Abstracts Accommodation Excursions Deadlines Organizing committee
First circular Participants Abstract submission Travel Program Seminar History Contact us
Первый циркуляр
Оформление тезисов
Важные даты
Обратная связь

Experimental study of syngenetic relations of diamond and its inclusions in the heterogeneous system eclogite-carbonatite-sulfide-diamond at 7.0 GPa


Vasiliev, P.*, Okoemova, V.*, Litvin Y.A**, Bobrov A.*

*Geological Faculty, Moscow State University, Russia

**Institute of Experimental Mineralogy, Chernogolovka, Russia



The role of physicochemical experiment is decisive for understanding of chemical and phase state of mantle diamond-forming media [1]. Application of the criterion of syngenesis of diamonds and primary inclusions is special importance for investigation of the systems with compositions similar to natural multi-component diamond-forming media. We studied melting relations for syngenesis of diamond and inclusions in the system eclogite (garnet +clinopyroxene) – K-Mg-Ca-carbonatite – sulfide (mixture of pyrrhotite, pentlandite, and chalcopyrite) – diamond at 7.0 GPa by the analysis of a fragment of the syngenesis diagram within the pseudo-binary section eclogite50-carbonatite50-diamond. The main element of this diagram is the curve of diamond solubility in completely miscible carbonate-silicate melts depending on temperature. The diagram shows melting relations in carbon-saturated diamond-forming carbonate-silicate melts with silicate (garnet and clinopyroxene) and carbonate (magnesite, aragonite, and K-carbonate) mineral phases.

The syngenesis diagram for the sulfide-diamond system contains the curve of diamond solubility in sulfide melts depending on temperature and demonstrates the areas where diamond growing in carbon-sulfide melts captures inclusions of sulfide melts and minerals. The general diagram of the multi-component eclogite-carbonatite-sulfide-diamond systems is a combination of two discussed diagrams. It demonstrates two curves of diamond solubility in sulfide and carbonate-silicate melts. The results obtained provide evidence for complete immiscibility of carbonate-silicate and sulfide components of parental melts and predominant crystallization of diamond in carbonate-silicate media. This is consistent with the carbonatite (carbonate-silicate) model of diamond genesis [1].


This study was financially supported by RFBR grants 08-05-00110 and 09-05-00751



[1] Litvin, Y.A. (2007) in Ohtani, E., ed., Advances in High-Pressure Mineralogy: Geological Society of America Special Paper 421,  High-pressure mineralogy of diamond genesis, 83-103.