Инд. авторы:	Bataleva Y.V., Palyanov Y., Borzdov Y., Novoselov I., Bayukov O.
Заглавие:	Graphite and Diamond Formation in the Carbide-Oxide-Carbonate Interactions (Experimental Modeling under Mantle P,T-Conditions)
Библ. ссылка:	Bataleva Y.V., Palyanov Y., Borzdov Y., Novoselov I., Bayukov O. Graphite and Diamond Formation in the Carbide-Oxide-Carbonate Interactions (Experimental Modeling under Mantle P,T-Conditions) // MINERALS. - 2018. - Vol.8. - Iss. 11. - Art.522. - ISSN 2075-163X.
Идентиф-ры:	DOI: 10.3390/min8110522; SCOPUS: 2-s2.0-85057315914; WoS: 000451530500049;
Реферат:	eng: Experimental modeling of the formation of graphite and diamond as a result of carbide-fluid interactions was performed in the Fe3C-SiO2-Al2O3-(Mg,Ca)CO3 systems at 6.3 and 7.5 GPa and 1100-1650 degrees C. In the experiments with fO(2)-gradient (7.5 GPa, 1250-1350 degrees C), graphite + magnesiowustite + garnet +/- cohenite assemblage was formed. Graphite was produced through the redox interactions of carbide with carbonate or CO2 (reducing conditions), and redox reactions of magnesiowustite and CO2 (oxidizing conditions). At 1450-1650 degrees C, crystallization of graphite, garnet, magnesiowustite and ferrospinel, as well as generation of Fe-2+,Fe-3+-rich carbonate-silicate melt occurred. This melt, saturated with carbon, acted as a medium of graphite crystallization and diamond growth on seeds. In the experiments without fO(2)-gradient (6.3 GPa), decarbonation reactions with the formation of CO2-fluid and Fe,Mg,Ca-silicates, as well as C-0-producing redox reactions of CO2-fluid with cohenite were simultaneously realized. As a result, graphite (+/- diamond growth) was formed in assemblage with Fe2+,Fe3+,Mg-silicates and magnetite (1100-1200 degrees C), or with Fe3+-rich garnet and orthopyroxene (1300-1500 degrees C). It has been established that a potential mechanism for the crystallization of graphite or diamond growth is the oxidation of cohenite by CO2-fluid to FeO and Fe3O4, accompanied by the extraction of carbon from Fe3C and the corresponding reduction of CO2 to C-0.
Ключевые слова:	OXIDATION; INCLUSIONS; CRYSTALLIZATION; STABILITY; METALLIC IRON; EARTHS MANTLE; CRYSTAL-GROWTH; IRON CARBIDE; HIGH-PRESSURE; metasomatism; lithospheric mantle; high pressure; experiment; garnet; carbonate; CO2 fluid; diamond; graphite; cohenite; NITROGEN;
Издано:	2018
Физ. хар-ка:	522