Solubilities of nitrogen and noble gases in silicate melts under various oxygen fugacities: implications for the origin and degassing history of nitrogen and noble gases in the earth

Miyazaki, Akiko; Hiyagon, H.; Sugiura, N.; Hirose, Kei; Takáhashi, Eiichi

doi:10.1016/s0016-7037(03)00484-8

Cited by 76 publications

(57 citation statements)

References 61 publications

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“…Nitrogen concentration in the core is ~0.5 wt.% (Sugiura, 1998), and its content for the core is estimated at ~1  10 24 g, which is several magnitudes higher than the total N budget in other parts of the Earth (Miyazaki et al, 2004). The solubility of N in molten iron was reported to be ~0.05 wt.% at 1600 o C; and it rapidly increases with decreasing fO 2 (Miyazaki et al, 2004). According to high-pressure experiments, the most probable concentrators of nitrogen are iron nitrides; the most stable of them is Fe 7 N 3 , which was synthesised at 51 GPa and is stable up to 168 GPa.…”

Section: Role Of Iron Carbides and Nitrogen In The Earth's Interiormentioning

confidence: 88%

Iron Carbide Inclusions in Lower-Mantle Diamond From Juina, Brazil

Kaminsky

Wirth

2011

The Canadian Mineralogist

120

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Iron carbides in association with native iron, graphite, and magnetite were identified in a diamond from the Juina area, Brazil, which contains a series of other, lower-mantle mineral inclusions. Among iron carbides, Fe 3 C, Fe 2 C ("chalypite"), and Fe 23 C 6 (haxonite) are present; the two latter are identified in the terrestrial environment for the first time. Some of the analyzed iron carbide grains contain 7.3-9.1 at.% N and are, in fact, nitrocarbide. It is suggested, based on the high-pressure mineral paragenesis previously observed in the diamond and experimental data on the system Fe-C, that "chalypite" crystallized, within a pressure interval of 50-130 GPa, from an iron-carbon melt, rich in nitrogen. Following crystallization, iron carbides and native iron were partially oxidised to magnetite, and encapsulated in diamond along with other highpressure minerals. The finds of various iron carbides, some of which are rich in nitrogen, in lower-mantle diamond confirm a significant role of carbides and nitrogen in the Earth's interior.

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Section: Role Of Iron Carbides and Nitrogen In The Earth's Interiormentioning

confidence: 88%

Iron Carbide Inclusions in Lower-Mantle Diamond From Juina, Brazil

Kaminsky

Wirth

2011

The Canadian Mineralogist

120

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“…Magma degassing in magma chambers or magmatic conduits may disturb the initial volatile composition due to different solubilities in magmas (Carroll and Webster 1994;Nuccio and Paonita 2001). N 2 , Ar and He have low solubilities in silicate melts, comparable within one order of magnitude, (Nuccio and Paonita 2001; Miyazaki et al 2004) and have low (N 2 ) or no (Ar, He) reactivity. Therefore they remain almost coupled until the surface.…”

Section: He As An Indicator Of the Parent Magmatic Gas Compositionmentioning

confidence: 99%

Geochemistry of volcanic and hydrothermal gases of Mutnovsky volcano, Kamchatka: evidence for mantle, slab and atmosphere contributions to fluids of a typical arc volcano

Zelenski

Taran

2011

Bull Volcanol

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We report chemical compositions (major and trace components including light hydrocarbons), hydrogen, oxygen, helium and nitrogen isotope ratios of volcanic and geothermal fluids of Mutnovsky volcano, Kamchatka. Several aspects of the geochemistry of fluids are discussed: chemical equilibria, mixing of fluids from different sources, evaluation of the parent magmatic gas composition and contributions to magmatic vapors of fluids from different reservoirs of the Kamchatkan subduction zone. Among reactive species, hydrogen and carbon monoxide in volcanic vapors are chemically equilibrated at temperatures >300°C with the SO 2 -H 2 S redox-pair. A metastable equilibrium between saturated and unsaturated light hydrocarbons is attained at close to discharge temperatures. Methane is disequilibrated. Three different sources of fluids from three fumarolic fields in the Mutnovsky craters can be distinguished: (1) magmatic gas from a large convecting magma body discharging through Active Funnel, a young crater with the hottest fumaroles (up to 620°C) contributing 80% to the total volcanic gas output; (2) volcanic fluid from a separate shallow magma body beneath the Bottom Field of the main crater (96-280°C fumaroles); and (3) hydrothermal fluid with a high relative and absolute concentrations of CH 4 from the Upper Field in the main crater (96-285°C fumaroles). The composition of the parent magmatic gas is estimated using water isotopes and correlations between He and other components in the Active Funnel gases. The He-Ar-N 2 systematics of volcanic and hydrothermal fluids of Mutnovsky are consistent with a large slab-derived sedimentary nitrogen input for the nitrogen inventory, and we calculate that only~1% of the magmatic N 2 has a mantle origin and <<1% is derived from the arc crust.

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“…Giggenbach, 1987;Haefner et al, 2002). In addition, there are a few lines of evidence that N behaves similarly to noble gases in nature (Marty, 1995) and in laboratory experiments (unless f O2 < IW-1.3 buffer: Libourel et al, 2003;Miyazaki et al, 2004, which is unlikely for terrestrial magmas). However, abundant N in granite (Boyd et al, 1993) and the existence of NH 4 + -bearing minerals at f O2 around the QMF buffer (Juster et al, 1987) underlines the importance of NH 4 + in fluids and magmas.…”

Section: Perspectives On N In the Mantlementioning

confidence: 99%

Nitrogen in peridotite xenoliths: Lithophile behavior and magmatic isotope fractionation

Yokochi

Marty

Chazot

et al. 2009

Geochimica et Cosmochimica Acta

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International audienceIn order to document the origin and speciation of nitrogen in mantle-derived rocks and minerals, the N and Ar contents and isotopic compositions were investigated for hydrous and anhydrous peridotite xenoliths from Ataq, Yemen, from Eifel, Germany, and from Massif Central, France. Nitrogen and Ar were extracted by stepwise combustion with a fine temperature resolution, followed by fusion in a platinum crucible. A large isotopic disequilibrium of up to 25.4‰ is observed within single peridotite xenoliths, with δ15N values as low as −17.3‰ in phlogopite whereas clinopyroxene and olivine show positive δ15N values. Identical Sr isotopic ratios of phlogopite, clinopyroxene and whole rock in this wehrlite sample are consistent with crystallization from a common reservoir, suggesting that the light N signature of phlogopite might be the result of isotopic fractionation during N uptake from the host magma. The nitrogen concentration is systematically high in phlogopite, (7.6–25.7 ppm), whereas that of bulk peridotite xenoliths is between 0.1 and 0.8 ppm. The high N content of phlogopite is at least partly due to host magma–mineral interaction, and may also suggest the occurrence of N as View the MathML source that substituted for K+ during mineral growth in mafic magmas. Such speciation is consistent with the fact that N and Rb contents correlate well for a set of samples from mantle regions that were affected by subduction-related metasomatism and magmatism. The N/Rb ratios of these samples are comparable with values estimated for subduction zone magmas, but are one order of magnitude lower than the N/Rb ratios characterizing subducting slabs. This difference suggests preferential release of N relative to alkalis in the forearc region. N/40Ar* ratios of minerals from analyzed mantle xenoliths are much higher than those of vesicles in MORBs and OIBs, requiring either the occurrence of nitrogen speciation in the mantle more compatible than Ar, significant loss of fluid phase during entrainment, or long residence time of volatile elements in the mantle source(s) of fluids to increase drastically the 40Ar* budget of the latter

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Solubilities of nitrogen and noble gases in silicate melts under various oxygen fugacities: implications for the origin and degassing history of nitrogen and noble gases in the earth

Cited by 76 publications

References 61 publications

Iron Carbide Inclusions in Lower-Mantle Diamond From Juina, Brazil

Iron Carbide Inclusions in Lower-Mantle Diamond From Juina, Brazil

Geochemistry of volcanic and hydrothermal gases of Mutnovsky volcano, Kamchatka: evidence for mantle, slab and atmosphere contributions to fluids of a typical arc volcano

Nitrogen in peridotite xenoliths: Lithophile behavior and magmatic isotope fractionation

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