Инд. авторы:	Litasov K.D., Safonov O.G., Ohtani E.
Заглавие:	Origin of Cl-bearing silica-rich melt inclusions in diamonds: Experimental evidence for an eclogite connection
Библ. ссылка:	Litasov K.D., Safonov O.G., Ohtani E. Origin of Cl-bearing silica-rich melt inclusions in diamonds: Experimental evidence for an eclogite connection // Geology. - 2010. - Vol.38. - Iss. 12. - P.1131-1134. - ISSN 0091-7613. - EISSN 1943-2682.
Внешние системы:	DOI: 10.1130/G31325.1; SCOPUS: 2-s2.0-78650132478;
Реферат:	eng: Melting phase relations of a model chloridefiand carbonate-bearing eclogite have been studied at 7.0-10.5 GPa and 1200-1675 °C. The mineral assemblage coexisting with partial melts is garnet, omphacite, kyanite, and coesite or stishovite. At temperatures of 1200-1400 °C, the partial melt has an SiO2-poor, Cl-bearing carbonatite composition. With increasing temperature, it becomes progressively SiO2 rich, and at temperatures of 1500-1700 °C contains as much as 53 wt% SiO2. The compositions of the melts are comparable with those of silicic end members of inclusions in fibrous and/or cloudy diamonds worldwide, implying that they may be produced via chemical reactions of alkalic chloride-carbonate liquids with mantle eclogites. Our experiments reproduced the trends of the compositional variations of the fluid or melt inclusions within eclogitic diamonds, and thus suggest a reliable model for their origin. © 2010 Geological Society of America.
Ключевые слова:	Compositional variation; Eclogites; Endmembers; Experimental evidence; Melt inclusions; Melting phase; Mineral assemblage; partial melting; silica; stishovite; omphacite; mineral deposit; melt inclusion; kyanite; garnet; eclogite; diamond; coesite; chemical composition; Diamonds; Silicate minerals; Silica; Metamorphic rocks; Diamond deposits; Chlorine compounds; Chlorine; Astatine; Reliable models; Partial melt; Carbonatites; Omphacite;
Издано:	2010
Физ. характеристика:	с.1131-1134