Инд. авторы:	Reutsky V.N., Borzdov Y.M., Palyanov Y.N.
Заглавие:	Carbon isotope fractionation during high pressure and high temperature crystallization of Fe-C melt
Библ. ссылка:	Reutsky V.N., Borzdov Y.M., Palyanov Y.N. Carbon isotope fractionation during high pressure and high temperature crystallization of Fe-C melt // Chemical Geology. - 2015. - Vol.406. - P.18-24. - ISSN 0009-2541. - EISSN 1878-5999.
Внешние системы:	DOI: 10.1016/j.chemgeo.2015.04.015; SCOPUS: 2-s2.0-84928997001; WoS: 000356234000003;
Реферат:	eng: There is a growing body of experimental evidence that iron carbides can play an important role in the mantle both as a host of carbon and as a redox couple (Fe-C) determining the nature of reduced phases. If carbides are significant in the mantle, it could be of interest to know if any carbon isotope fractionation accompanies carbide crystallization. A series of high-pressure and high-temperature experiments were performed on carbide crystallization from a Fe-C melt. An offset of 2% was observed between the delta C-13 values of Fe3C and Fe-C melt at 6.3 GPa and 1400 degrees C. The carbon isotopic compositions of Fe3C and diamond crystallizing from a single carbon source near the peritectic region at 6.3 GPa differ by 2.5%. Fe7C3 was detected as a quench phase during Fe-C melt quenching. Our results have important implications for understanding carbon isotope distributions in iron meteorites and indicate that iron carbide crystallization may be a significant mechanism for carbon isotope heterogeneity in the Earth's mantle. (C) 2015 Elsevier B.V. All rights reserved.
Ключевые слова:	SYSTEM; GRAPHITE; METEORITES; GROWTH; DIAMOND; DEEP MANTLE; C-12-ENRICHED CARBON; GEOCHEMISTRY; IRON CARBIDE MELT; Carbon isotope fractionation; Crystallization; Diamond; Iron carbide; HPHT experiment; Fe-C melt; EARTHS MANTLE;
Издано:	2015
Физ. характеристика:	с.18-24