Abstract
Experimental studies were performed in the Fe3C–S system at P = 6.3 GPa, T = 900–1600°C, and t = 18–20 h. The study aimed to characterize the conditions of iron carbide stability in a reduced lithospheric mantle and to reveal the possibility of the formation of elemental carbon by the interaction of iron carbide and sulfur. It was found that the reaction at T < 1200°C proceeds with the formation of a pyrrhotite–graphite assemblage by the following scheme: 2Fe3C + 3S2 → 6FeS + 2C0. The crystallization of graphite at T < 1200°C is accompanied by the generation of sulfide and metal–sulfide melts and via 2Fe3C + 3S2 → 6[Fe–S(melt) + Fe–S–C(melt)] + 2C 0(graphite) reaction. Resulting from the carbon-generating reactions, not only graphite crystallized in sulfide or metal–sulfide melts, but the growth of diamond also takes place. The obtained data allow one to consider cohenite as a potential source of carbon in the processes of diamond and graphite crystallization under the conditions of a reduced lithospheric mantle. The interaction of iron carbide and sulfur under which carbon extraction proceeds may be one of possible processes of the global carbon cycle.
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Original Russian Text © Yu.V. Bataleva, Yu.N. Palyanov, Yu.M. Borzdov, O.A. Bayukov, N.V. Sobolev, 2015, published in Doklady Akademii Nauk, 2015, Vol. 463, No. 2, pp. 192–196.
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Bataleva, Y.V., Palyanov, Y.N., Borzdov, Y.M. et al. Interaction of iron carbide and sulfur under P–T conditions of the lithospheric mantle. Dokl. Earth Sc. 463, 707–711 (2015). https://doi.org/10.1134/S1028334X15070077
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DOI: https://doi.org/10.1134/S1028334X15070077