Инд. авторы:	Dymshits A.M., Sharygin I.S., Liu Z., Korolev N., Malkovets V.G., Alifirova T.A., Yakovlev I.V., Xu Y.G.
Заглавие:	Oxidation State of the Lithospheric Mantle Beneath Komsomolskaya-Magnitnaya Kimberlite Pipe, Upper Muna Field, Siberian Craton
Библ. ссылка:	Dymshits A.M., Sharygin I.S., Liu Z., Korolev N., Malkovets V.G., Alifirova T.A., Yakovlev I.V., Xu Y.G. Oxidation State of the Lithospheric Mantle Beneath Komsomolskaya-Magnitnaya Kimberlite Pipe, Upper Muna Field, Siberian Craton // MINERALS. - 2020. - Vol.10. - Iss. 9. - Art.740.
Идентиф-ры:	DOI: 10.3390/min10090740; WoS: 000579951000001;
Реферат:	eng: The oxidation state of the mantle plays an important role in many chemical and physical processes, including magma genesis, the speciation of volatiles, metasomatism and the evolution of the Earth's atmosphere. We report the first data on the redox state of the subcontinental lithospheric mantle (SCLM) beneath the Komsomolskaya-Magnitnaya kimberlite pipe (KM), Upper Muna field, central Siberian craton. The oxygen fugacity of the KM peridotites ranges from -2.6 to 0.3 logarithmic units relative to the fayalite-magnetite-quartz buffer ( increment logfO(2)(FMQ)) at depths of 120-220 km. The enriched KM peridotites are more oxidized (-1.0-0.3 increment logfO(2)(FMQ)) than the depleted ones (from -1.4 to -2.6 increment logfO(2)(FMQ)). The oxygen fugacity of some enriched samples may reflect equilibrium with carbonate or carbonate-bearing melts at depths >170 km. A comparison of well-studied coeval Udachnaya and KM peridotites revealed similar redox conditions in the SCLM of the Siberian craton beneath these pipes. Nevertheless, Udachnaya peridotites show wider variations in oxygen fugacity (-4.95-0.23 increment logfO(2)(FMQ)). This indicates the presence of more reduced mantle domains in the Udachnaya SCLM. In turn, the established difference in the redox conditions is a good explanation for the lower amounts of resorbed diamonds in the Udachnaya pipe (12%) in comparison with the KM kimberlites (33%). The obtained results advocate a lateral heterogeneity in the oxidation state of the Siberian SCLM.
Ключевые слова:	GARNET PERIDOTITES; WESSELTON KIMBERLITE; ULTRAMAFIC XENOLITHS; REDOX STATE; DIAMOND DISSOLUTION; U-PB; UDACHNAYA KIMBERLITE; OXYGEN FUGACITY; PERIDOTITE XENOLITHS; mantle metasomatism; Siberian craton; diamond; kimberlite; peridotite; xenolith; diamond; redox state; oxidation state; craton; lithospheric mantle; SUBCALCIC GARNET;
Издано:	2020
Физ. хар-ка:	740