The evolution of terrestrial volatiles: a view from helium, neon, argon and nitrogen isotope modelling

Tolstikhin, Igor; Marty, Bernard

doi:10.1016/s0009-2541(97)00170-8

Cited by 147 publications

(82 citation statements)

References 103 publications

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“…The observed N concentrations of bulk peridotite xenoliths are however close to the lower end of the estimated values. Furthermore, observed radiogenic 40 Ar concentrations of bulk peridotite xenoliths (0.14-5.4 ×10 -12 mol/g) are more than an order of magnitude lower than the modeled one (8 ×10 -11 mol/g: Tolastikhin and Marty, 1998). This suggests that a significant fraction of mantle-derived fluid phase might have been lost during the entrainment of the peridotite xenoliths probably due to decrepitation of fluid inclusions.…”

Section: Perspectives On N In the Mantlementioning

confidence: 70%

“…If N is proven to abundantly occur in the mantle in other speciation than molecular N, it would become necessary to consider that the concentration of N in the mantle might be higher than previous estimates based on model Ar concentrations of the mantle and N 2 /Ar ratios of fluid inclusions (0.27 and 2.7 ppm for depleted and undepleted mantle : Tolstikhin and Marty, 1998). The observed N concentrations of bulk peridotite xenoliths are however close to the lower end of the estimated values.…”

Section: Perspectives On N In the Mantlementioning

confidence: 98%

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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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Section: Perspectives On N In the Mantlementioning

confidence: 70%

Section: Perspectives On N In the Mantlementioning

confidence: 98%

Nitrogen in peridotite xenoliths: Lithophile behavior and magmatic isotope fractionation

Yokochi

Marty

Chazot

et al. 2009

Geochimica et Cosmochimica Acta

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“…The formation and evolution of the geo-, hydro-, and atmosphere are closely linked to the behavior of volatiles in the Earth's interior (e.g., Kasting et al, 1993;Jambon, 1994;Holloway, 1998;Tolstikhin and Marty, 1998;Deines, 2002;Cartigny and Ader, 2003). Volatiles in the CAOAH system (H 2 O, H 2 , CO 2 , CO, CH 4 ) dominate in the silicate Earth (e.g., Jambon, 1994).…”

Section: Introductionmentioning

confidence: 99%

Solution behavior of reduced COH volatiles in silicate melts at high pressure and temperature

Mysen

Fogel

Morrill

et al. 2009

Geochimica et Cosmochimica Acta

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The solubility and solution mechanisms of reduced CAOAH volatiles in Na 2 OASiO 2 melts in equilibrium with a (H 2 + CH 4 ) fluid at the hydrogen fugacity defined by the iron-wü stite + H 2 O buffer [f H2 (IW)] have been determined as a function of pressure (1-2.5 GPa) and silicate melt polymerization (NBO/Si: nonbridging oxygen per silicon) at 1400°C. The solubility, calculated as CH 4 , increases from $0.2 wt% to $0.5 wt% in the melt NBO/Si-range $0.4 to $1.0. The solubility is not significantly pressure-dependent, probably because f H2 (IW) in the 1-2.5 GPa range does not vary greatly with pressure. Carbon isotope fractionation between methane-saturated melts and (H 2 + CH 4 ) fluid varied by $14& in the NBO/Si-range of these melts. The (C..H) and (O..H) speciation in the quenched melts was determined with Raman and 1 H MAS NMR spectroscopy. The dominant (C..H)-bearing complexes are molecular methane, CH 4 , and a complex or functional group that includes entities with C"CAH bonding. Minor abundance of complexes that include SiAOACH 3 bonding is tentatively identified in some melts. There is no spectroscopic evidence for SiAC or SiACH 3 . Raman spectra indicate silicate melt depolymerization (increasing NBO/Si). The [CH 4 /C"CAH] melt abundance ratio is positively correlated with NBO/Si, which is interpreted to suggest that the (C"CAH)-containing structural entity is bonded to the silicate melt network structure via its nonbridging oxygen. The $14& carbon isotope fractionation change between fluid and melt is because of the speciation changes of carbon in the melt.

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“…primitive, never melted) Earth's mantle, which is between the inferred R/Ra ratio of 120 and 330 for the initial solar nebula and the solar wind, respectively (Class and Goldstein 2005; and references therein). The much higher 3 He content within the mantle reflects the inherited primordial 3 He from when the Earth was formed, with the upper mantle being almost completely degassed compared with the lower mantle (Allègre et al 1987;Tolstikhin and Marty 1998). Alternatively, mantle convection and magmatism results in variable helium isotopic depletion where prolonged isolation of plume sources preserves the high 3 He/ 4…”

Section: Sub-surface Sources Of Heliummentioning

confidence: 99%

“…11)) than any association of nitrogen with mantle 3 He. Given that the atmospheric nitrogen content and its N-isotopic compositions (d 15 N N 2 ) have remained conservative for the past 4 Ga (Tolstikhin and Marty 1998), the complementary isotopic composition of nitrogen is a powerful tool in the attribution of organic, inorganic and mixed sources of nitrogen in natural gases (Liu et al 2016;and references therein). Although the majority of gases shown in Fig.…”

Section: Nitrogenmentioning

confidence: 99%

Helium in the Australian liquefied natural gas economy

et al. 2018

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Australia is about to become the premier global exporter of liquefied natural gas (LNG), bringing increased opportunities for helium extraction. Processing of natural gas to LNG necessitates the exclusion and disposal of non-hydrocarbon components, principally carbon dioxide and nitrogen. Minor to trace hydrogen, helium and higher noble gases in the LNG feed-in gas become concentrated with nitrogen in the non-condensable LNG tail gas. Helium is commercially extracted worldwide from this LNG tail gas. Australia has one helium plant in Darwin where gas (containing 0.1% He) from the Bayu-Undan accumulation in the Bonaparte Basin is processed for LNG and the tail gas, enriched in helium (3%), is the feedstock for helium extraction. With current and proposed LNG facilities across Australia, it is timely to determine whether the development of other accumulations offers similar potential. Geoscience Australia has obtained helium contents in ~800 Australian natural gases covering all hydrocarbon-producing sedimentary basins. Additionally, the origin of helium has been investigated using the integration of helium, neon and argon isotopes, as well as the stable carbon (13C/12C) isotopes of carbon dioxide and hydrocarbon gases and isotopes (15N/14N) of nitrogen. With no apparent loss of helium and nitrogen throughout the LNG industrial process, together with the estimated remaining resources of gas accumulations, a helium volumetric seriatim results in the Greater Sunrise (Bonaparte Basin) > Ichthys (Browse Basin) > Goodwyn–North Rankin (Northern Carnarvon Basin) accumulations having considerably more untapped economic value in helium extraction than the commercial Bayu-Undan LNG development.

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The evolution of terrestrial volatiles: a view from helium, neon, argon and nitrogen isotope modelling

Cited by 147 publications

References 103 publications

Nitrogen in peridotite xenoliths: Lithophile behavior and magmatic isotope fractionation

Nitrogen in peridotite xenoliths: Lithophile behavior and magmatic isotope fractionation

Solution behavior of reduced COH volatiles in silicate melts at high pressure and temperature

Helium in the Australian liquefied natural gas economy

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