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- Title
Formation of N-С-О-Н molecules and complexes in the basalt-basaltic andesite melts at 1.5 Gpa and 1400°C in the presence of liquid iron alloys.
- Authors
Kadik, A.; Kurovskaya, N.; Lukanin, O.; Ignat'ev, Yu.; Koltashev, V.; Kryukova, E.; Plotnichenko, V.; Kononkova, N.
- Abstract
The contents and speciation of nitrogen, carbon, and hydrogen were determined in basalt-basaltic andesite melts in equilibrium with liquid Fe alloys at 1.5 Gpa, 1400°C, and oxygen fugacity ( fO) 1.4-1.9 log units below that of the Fe-FeO buffer (Δlog fO(IW) =-1.4 ...-1.9). Experiments were carried out on a piston- cylinder type apparatus using welded Pt capsules in the presence of excess С (graphite). Starting mixture consisted of natural ferrobasaltic glass and silicon nitride (SiN) as nitrogen source in the system. Experimental quench products representing glasses with spherical inclusions of iron alloy were analyzed using electron microprobe, Raman, and IR spectroscopy. With increase of SiN in the starting mixture and, respectively, decrease of fO, silicate melt forming during experiments became depleted in FeO and enriched in SiO. It was established that the nitrogen content in the glasses increases from 0.13 to 0.44 wt % with decrease of Δlog fO(IW) from-1.4 to-1.9, whereas C content in the first approximation remains constant within 1.18-1.13 wt %, while the total water content (ОН + НО) determined by IR spectroscopy decreases from 4.91 to 1.20 wt %. The N (0.13-0.48 wt %) and C (0.75-2.26 wt %) contents determined in the Fe alloy show no clear correlation with fO. The IR and Raman spectroscopic study of the glasses indicates the formation of molecules and complexes with bonds N-H (NH, NH , NH , NH ), Н-О (НО, OH), С-Н (СН) as well as N and Н molecules in silicate melts. IR spectra also reveal the presence of complexes with С=О, С-N bonds and СО molecules. Obtained data are compared with results of previous studies on the solubility and speciation of N, С, and Н in the model FeO-NaO-SiO-AlO melts in equilibrium with liquid iron alloys at 1.5 GPa (1400°C) and 4 GPa (1550°C) (Kadik et al., 2011, 2015).
- Subjects
NITROGEN compound spectra; SILICON nitride synthesis; CHEMICAL speciation; ANDESITE; IRON alloys; RAMAN spectroscopy
- Publication
Geochemistry International, 2017, Vol 55, Issue 2, p151
- ISSN
0016-7029
- Publication type
Article
- DOI
10.1134/S0016702917020033