Influence of oxygen fugacity on the solubility of nitrogen, carbon, and hydrogen in FeO-Na2O-SiO2-Al2O3 melts in equilibrium with metallic iron at 1.5 GPa and 1400°C

Кадик, А. А.; Kurovskaya, N. A.; Ignat’ev, Yu. A.; Кононкова, Н. Н.; Колташев, В. В.; Плотниченко, В. Г.

doi:10.1134/s001670291105003x

Cited by 73 publications

(59 citation statements)

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“…However, considering that nitrogen solubility in reduced silicate melt ranges up to a few wt. % (Kadik et al, 2011(Kadik et al, , 2013Roskosz et al, 2013) and only a few hundred ppm nitrogen was present in our silicate melt, partial crystallisation during quench may not have caused exsolution of nitrogen. The observed systematic dependence of D N metal/silicate on oxygen fugacity ( Fig.…”

Section: Resultsmentioning

confidence: 99%

“…Figure 1 shows that regardless of pressure or temperature, D N metal/silicate increases with increasing oxygen fugacity, as calculated from the composition of the coexisting quenched metal and silicate (Table S-1). The trend in Figure 1 can be rationalised if one assumes that under these very reducing conditions below the iron-wüstite buffer, nitrogen is mostly dissolved as N 3-ion in the silicate melt (Kadik et al, 2011(Kadik et al, , 2013Li et al, 2015), while it dissolves as interstitial N atoms in the metal (Häglund et al, 1993 Figure 1. We noticed that the silicates recovered from the multi-anvil experiments performed at 5.0 to 7.0 GPa were not completely glassy, but contained fine-grained quench crystals.…”

Section: Resultsmentioning

confidence: 99%

“…1) also precludes any significant exsolution of nitrogen during quench. (Kadik et al, 2011(Kadik et al, , 2013Roskosz et al, 2013) are plotted for comparison. D N metal/silicate is a function of oxygen fugacity, regardless of pressure or temperature.…”

Section: Resultsmentioning

confidence: 99%

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Nitrogen isotope fractionation during terrestrial core-mantle separation

Li¹,

Marty²,

Shcheka³

et al. 2016

Geochem. Persp. Let.

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doi: 10.7185/geochemlet.1614The origin and evolution of the terrestrial nitrogen remains largely unresolved. In order to understand the potential influence of core-mantle separation on terrestrial nitrogen evolution, experiments were performed at 1.5 to 7.0 GPa and 1600 to 1800 °C to study nitrogen isotope fractionation between coexisting liquid Fe-rich metal and silicate melt. The results show that the metal/silicate partition coefficient of nitrogen D N metal/silicate ranges from 1 to 150 and the nitrogen isotope fractionation d15 N metal-silicate is −3.5 ± 1.7 ‰. Calculations show that the bulk Earth is more depleted in d 15 N than the present-day mantle, and that the presentday mantle d 15 N of −5 ‰ could be derived from an enstatite chondrite composition via terrestrial core-mantle separation, with or without the addition of carbonaceous chondrites. These results strongly support the notion that enstatite chondrites may be a main component from which the Earth formed and a main source of the terrestrial nitrogen. Moreover, in the deep reduced mantle, the Fe-rich metal phase may store most of the nitrogen, and partial melting of the coexisting silicates may generate oceanic island basalts (OIBs) with slightly positive d15 N values.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Nitrogen isotope fractionation during terrestrial core-mantle separation

Li¹,

Marty²,

Shcheka³

et al. 2016

Geochem. Persp. Let.

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“…However, it should be noted that the heterogeneous distribution of water in lunar mantle (e.g., Albarède et al, 2014;Robinson and Taylor, 2014) must cause different parts of the lunar mantle to degas carbon with different efficiencies, and extremely dry parts of the lunar mantle may not degas significant quantity of CH 4 . Furthermore, these calculated values of CH 4 contents in both lunar and Martian basalts may be maximum because other volatiles such as nitrogen at reduced conditions (Kadik et al, 2011;Li et al, 2013Li et al, , 2015 may compete for non-hydroxyl hydrogen. However, with 200-600 ppm H and log f O 2 of IW-2 to IW, our experiments indeed show 20-70 ppm CH 4 in silicate melt (see Fig.…”

Section: Degassing Of C-o-h Volatiles Via Partial Melting Of Reduced mentioning

confidence: 97%

The effects of sulfur, silicon, water, and oxygen fugacity on carbon solubility and partitioning in Fe-rich alloy and silicate melt systems at 3 GPa and 1600 °C: Implications for core–mantle differentiation and degassing of magma oceans and reduced planetary mantles

Dasgupta

Tsuno

2015

Earth and Planetary Science Letters

104

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“…Although the peak could arise from molecular H 2 O, recent studies have attributed peaks at 3,350 cm −1 (15), 3,310 cm −1 (14), and 3,290 cm −1 (32) to C-H stretching in alkyne groups. Another study (33) assigns peaks at 3,188, 3,293, and 3,377 cm −1 to N-H bonds. Overtone bands of carbonyl stretching vibrations can also occur at 3200-3600 cm −1 (31).…”

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Degassing of reduced carbon from planetary basalts

Wetzel

Rutherford

Jacobsen

et al. 2013

Proc. Natl. Acad. Sci. U.S.A.

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Degassing of planetary interiors through surface volcanism plays an important role in the evolution of planetary bodies and atmospheres. On Earth, carbon dioxide and water are the primary volatile species in magmas. However, little is known about the speciation and degassing of carbon in magmas formed on other planets (i.e., Moon, Mars, Mercury), where the mantle oxidation state [oxygen fugacity (fO 2 )] is different from that of the Earth. Using experiments on a lunar basalt composition, we confirm that carbon dissolves as carbonate at an fO 2 higher than -0.55 relative to the iron wustite oxygen buffer (IW-0.55), whereas at a lower fO 2 , we discover that carbon is present mainly as iron pentacarbonyl and in smaller amounts as methane in the melt. The transition of carbon speciation in mantle-derived melts at fO 2 less than IW-0.55 is associated with a decrease in carbon solubility by a factor of 2. Thus, the fO 2 controls carbon speciation and solubility in mantle-derived melts even more than previous data indicate, and the degassing of reduced carbon from Fe-rich basalts on planetary bodies would produce methane-bearing, CO-rich early atmospheres with a strong greenhouse potential.hydrogen | iron carbonyl | magmatic volatiles | experimental petrology M agmas formed through igneous processes on parent bodies in the early solar system span 12 log units in oxidation state, from 6.3 log units of oxygen fugacity (fO 2 ) below the iron wustite oxygen buffer (IW) to 6 log units above the IW (IW−6.3 to IW+6) (1-4). Over the wide range of basalt fO 2 observed in these planetary bodies, thermodynamic data for the C-O-H gas system indicate that there are significant changes in gas phase speciation (5). These differences should be reflected in how volatiles are dissolved in magmas, but carbon speciation experiments for basaltic systems are limited, particularly at low fO 2 . The developing evidence for volatiles in magmas erupted on the Moon (6, 7) as well as on Earth (3,8), Mars (9-12), and Mercury (13) is a strong incentive to improve our understanding of C-O-H speciation and solubility in planetary basaltic magmas.Previous experimental studies on the speciation of carbon in Fe-free silicate systems under reducing conditions or at fO 2 < IW show carbon is dissolved as methane (14-16). However, under more oxidizing conditions in basaltic melt compositions, carbon is dissolved as carbonate (17)(18)(19), and the transition in speciation from methane to carbonate has long been debated as either occurring at more reducing conditions than IW+1 (20, 21) or at more oxidizing conditions (15). Another study (22) shows that a significant amount of C 4+ (carbonate) can be incorporated at extremely low fO 2 (IW−4.5) if Fe and alkalis are present in the melt. Additional experiments on Fe-bearing basalt are clearly required to resolve the conflicts in existing data. The results are important in understanding the residence time of carbon in the mantle and the rate of carbon degassing during the early evolution of terrestrial planets ...

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Influence of oxygen fugacity on the solubility of nitrogen, carbon, and hydrogen in FeO-Na2O-SiO2-Al2O3 melts in equilibrium with metallic iron at 1.5 GPa and 1400°C

Cited by 73 publications

References 29 publications

Nitrogen isotope fractionation during terrestrial core-mantle separation

Nitrogen isotope fractionation during terrestrial core-mantle separation

The effects of sulfur, silicon, water, and oxygen fugacity on carbon solubility and partitioning in Fe-rich alloy and silicate melt systems at 3 GPa and 1600 °C: Implications for core–mantle differentiation and degassing of magma oceans and reduced planetary mantles

Degassing of reduced carbon from planetary basalts

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