Инд. авторы:	Sokol A.G., Tomilenko A.A., Bul’bak T.A, Kruk A.N., Zaikin P.A., Sokol I.A, Seryotkin Y.V., Palyanov Y.N.
Заглавие:	The Fe–C–O–H–N system at 6.3–7.8 GPa and 1200–1400 °C: implications for deep carbon and nitrogen cycles
Библ. ссылка:	Sokol A.G., Tomilenko A.A., Bul’bak T.A, Kruk A.N., Zaikin P.A., Sokol I.A, Seryotkin Y.V., Palyanov Y.N. The Fe–C–O–H–N system at 6.3–7.8 GPa and 1200–1400 °C: implications for deep carbon and nitrogen cycles // Contributions to Mineralogy and Petrology. - 2018. - Vol.173. - Iss. 6. - Art.47. - ISSN 0010-7999. - EISSN 1432-0967.
Внешние системы:	DOI: 10.1007/s00410-018-1472-3; РИНЦ: 35514307; SCOPUS: 2-s2.0-85047405082; WoS: 000433207600002;
Реферат:	eng: Interactions in a Fe–C–O–H–N system that controls the mobility of siderophile nitrogen and carbon in the Fe0-saturated upper mantle are investigated in experiments at 6.3–7.8 GPa and 1200–1400 °C. The results show that the γ-Fe and metal melt phases equilibrated with the fluid in a system unsaturated with carbon and nitrogen are stable at 1300 °C. The interactions of Fe3C with an N-rich fluid in a graphite-saturated system produce the ε-Fe3N phase (space group P63/mmc or P6322) at subsolidus conditions of 1200–1300 °C, while N-rich melts form at 1400 °C. At IW- and MMO-buffered hydrogen fugacity (fH2), fluids vary from NH3- to H2O-rich compositions (NH3/N2 > 1 in all cases) with relatively high contents of alkanes. The fluid derived from N-poor samples contains less H2O and more carbon which mainly reside in oxygenated hydrocarbons, i.e., alcohols and esters at MMO-buffered fH2 and carboxylic acids at unbuffered fH2 conditions. In unbuffered conditions, N2 is the principal nitrogen host (NH3/N2 ≤ 0.1) in the fluid equilibrated with the metal phase. Relatively C- and N-rich fluids in equilibrium with the metal phase (γ-Fe, melt, or Fe3N) are stable at the upper mantle pressures and temperatures. According to our estimates, the metal/fluid partition coefficient of nitrogen is higher than that of carbon. Thus, nitrogen has a greater affinity for iron than carbon. The general inference is that reduced fluids can successfully transport volatiles from the metal-saturated mantle to metal-free shallow mantle domains. However, nitrogen has a higher affinity for iron and selectively accumulates in the metal phase, while highly mobile carbon resides in the fluid phase. This may be a controlling mechanism of the deep carbon and nitrogen cycles. © 2018, Springer-Verlag GmbH Germany, part of Springer Nature.
Ключевые слова:	Fluid; Gas chromatography–mass spectrometry; upper mantle; oxygen; nitrogen cycle; mass spectrometry; iron; hydrogen; high temperature; high pressure; gas chromatography; carbon cycle; Nitrogen; Metal; Mantle; Hydrocarbons; hydrocarbon; Carbon;
Издано:	2018
Физ. характеристика:	47
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