Инд. авторы:	Mikhailenko D.S., Stagno V., Korsakov A.V., Andreozzi G.B., Marras G., Cerantola V., Malygina E.V.
Заглавие:	Redox state determination of eclogite xenoliths from Udachnaya kimberlite pipe (Siberian craton), with some implications for the graphite/diamond formation
Библ. ссылка:	Mikhailenko D.S., Stagno V., Korsakov A.V., Andreozzi G.B., Marras G., Cerantola V., Malygina E.V. Redox state determination of eclogite xenoliths from Udachnaya kimberlite pipe (Siberian craton), with some implications for the graphite/diamond formation // Contributions to Mineralogy and Petrology. - 2020. - Vol.175. - Iss. 11. - Art.107. - ISSN 0010-7999. - EISSN 1432-0967.
Внешние системы:	DOI: 10.1007/s00410-020-01748-3; РИНЦ: 45186596; WoS: 000587962500001;
Реферат:	eng: The formation of diamonds within eclogitic rocks has been widely linked to the fate of carbon during subduction and, therefore, referred to conditions of pressure, temperature, and oxygen fugacity (fo(2)). Mantle-derived eclogite xenoliths from Udachnaya kimberlite pipes represent a unique window to investigate the formation of carbon-free, graphite-diamond-bearing and diamond-bearing rocks from the Siberian craton. With this aim, we exploited oxy-thermobarometers to retrieve information on the P-T-fo(2) at which mantle eclogites from the Siberian craton equilibrated along with elemental carbon. The chemical analyses of coupled garnet and omphacitic clinopyroxene were integrated with data on their iron oxidation state, determined both by conventional and synchrotron Fe-57 Mossbauer spectroscopy. The calculated fo(2)s largely vary for each suite of eclogite samples from 0.10 to - 2.43 log units (Delta FMQ) for C-free eclogites, from - 0.01 to - 2.91 (Delta FMQ) for graphite-diamond-bearing eclogites, and from - 2.08 to - 3.58 log units (Delta FMQ) for diamond-bearing eclogites. All eclogite samples mostly fall in the fo(2) range typical of diamond coexisting with CO2-rich water-bearing melts and gaseous fluids, with diamondiferous eclogites being more reduced at fo(2) conditions where circulating fluids can include some methane. When uncertainties on the calculated fo(2) are taken into account, all samples essentially fall within the stability field of diamonds coexisting with CO2-bearing melts. Therefore, our results provide evidence of the potential role of CO2-bearing melts as growth medium on the formation of coexisting diamond and graphite in mantle eclogites during subduction of the oceanic crust.
Ключевые слова:	TRACE-ELEMENT; CARBON-ISOTOPE; METAMORPHIC ROCKS; PERIDOTITE MASSIF; LITHOSPHERIC MANTLE; GRAPHITIZED DIAMONDS; SOUTH-AFRICA; OXIDATION-STATE; Ferric iron; Carbon cycle; Oxygen fugacity; Graphite; Diamond; Eclogite; DIAMOND CRYSTALLIZATION; EARTHS MANTLE;
Издано:	2020
Физ. характеристика:	107
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