Инд. авторы:	Bataleva Y.V., Palyanov Y.N., Sokol A.G., Borzdov Y.M., Palyanova G.A.
Заглавие:	Conditions for the origin of oxidized carbonate-silicate melts: Implications for mantle metasomatism and diamond formation
Библ. ссылка:	Bataleva Y.V., Palyanov Y.N., Sokol A.G., Borzdov Y.M., Palyanova G.A. Conditions for the origin of oxidized carbonate-silicate melts: Implications for mantle metasomatism and diamond formation // Lithos. - 2012. - Vol.128-131. - P.113-125. - ISSN 0024-4937. - EISSN 1872-6143.
Внешние системы:	DOI: 10.1016/j.lithos.2011.10.010; SCOPUS: 2-s2.0-82655186733;
Реферат:	eng: An experimental study on the origin of ferric and ferrous carbonate-silicate melts, which can be considered as the potential metasomatic oxidizing agents and diamond forming media, was performed in the (Ca,Mg)CO 3-SiO 2-Al 2O 3-(Mg,Fe)(Cr,Fe,Ti)O 3 system, at 6.3GPa and 1350-1650°C. At 1350-1450°C and f{hook}O 2 of FMQ+2 log units, carbonate-silicate melt, coexisting with Fe 3+-bearing ilmenite, pyrope-almandine and rutile, contained up to 13wt.% of Fe 2O 3. An increase in the degree of partial melting was accompanied by decarbonation and melt enrichment with CO 2, up to 21wt.%. At 1550-1650°C excess CO 2 segregated as a separate fluid phase. The restricted solubility of CO 2 in the melt indicated that investigated system did not achieve the second critical point at 6.3GPa. At 1350-1450°C and f{hook}O 2 close to CCO buffer, Fe 2+-bearing carbonate-silicate melt was formed in association with pyrope-almandine and Fe 3+-bearing rutile. It was experimentally shown that CO 2-rich ferrous carbonate-silicate melt can be an effective waterless medium for the diamond crystallization. It provides relatively high diamond growth rates (3-5μm/h) at P,T-conditions, corresponding to the formation of most natural diamonds. © 2011 Elsevier B.V..
Ключевые слова:	silicate melt; redox conditions; P-T conditions; metasomatism; mantle structure; ilmenite; high temperature; high pressure; experimental mineralogy; solubility; crystallization; carbonate group; carbon dioxide; Redox reactions; Mantle metasomatism; Ilmenite; HPHT experiment; Diamond formation; Carbonate-silicate melt; diamond;
Издано:	2012
Физ. характеристика:	с.113-125