Interstitial voids in silica melts and implication for argon solubility under high pressures

Zhang, Chi; Duan, Zhenhao; Li, Mingyan

doi:10.1016/j.gca.2010.04.017

Cited by 19 publications

(13 citation statements)

References 46 publications

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“…Up to 0.25 wt%Ar was detected in the SiO 2 rich glass, but no Xe was detected in the decomposed products. We note that this 0.25 wt%Ar content value is similar to that measured in silica melts quenched from above 5 GPa (Chamorro-Perez et al, 1998;Bouhifd et al, 2008;Zhang et al, 2010). Such decomposition of San Carlos olivine is commonly reported in high-T experiments when using a Pt caspule (Jaoul et al, 1987;Kohlstedt and Maxwell, 1987) and often described as early partial melting.…”

Section: Decomposed Samples: a Clue To Noble Gas Solubility Mechanismsupporting

confidence: 84%

“…Ar solubility drop has been observed in laser-heated diamond anvil cell experiments, and a positive correlation between the P drop onset and the Al/Al + Si ratio (Bouhifd and Jephcoat, 2006) may explain why previous multi-anvil experiments did not report it (Schmidt and Keppler, 2002). Theoretical work has confirmed that gradual structural transformations of the silicate melt could explain the solubility drop above 5 GPa in silica (Zhang et al, 2010).…”

Section: Noble Gases Solubility In Silicates: Natural Samples and Expmentioning

confidence: 85%

See 1 more Smart Citation

Xenon and Argon: A contrasting behavior in olivine at depth

Sanloup¹,

Schmidt²,

Guðfinnsson³

et al. 2011

Geochimica et Cosmochimica Acta

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Section: Decomposed Samples: a Clue To Noble Gas Solubility Mechanismsupporting

confidence: 84%

Section: Noble Gases Solubility In Silicates: Natural Samples and Expmentioning

confidence: 85%

Xenon and Argon: A contrasting behavior in olivine at depth

Sanloup¹,

Schmidt²,

Guðfinnsson³

et al. 2011

Geochimica et Cosmochimica Acta

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“…He and Ne) are preferentially solvated with respect to large ones. More recently, Zhang et al (2010) evaluated by MD simulation the distribution of interstitial voids in the structure of fused silica in modeling the oxygen and silicon atoms as exclusion spheres of given radii. The Ar solubility is calculated from a statistical model depending on the hole size distribution and the fugacity of the coexisting noble gas fluid.…”

Section: Introductionmentioning

confidence: 99%

Noble gases in high-pressure silicate liquids: A computer simulation study

Guillot

Sator

2012

Geochimica et Cosmochimica Acta

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The test particle method has been used in conjunction with molecular dynamics simulations to evaluate the solubility of noble gases in silicate melts of various composition. At low pressure the calculated solubility constants (the inverse of the Henry's constant) are in excellent agreement with data of the literature. In particular it is found that the solubility constant (i) decreases when the size of the noble gas increases, (ii) decreases from silica-rich to silica-poor composition of the melt, and (iii) is positively correlated with the temperature. Moreover it is shown that the solubility is governed primarily by the entropic cost of cavity formation for inserting the noble gas into the melt and secondarily by its solvation energy. Interestingly, the behaviour of these two contributions differ from each other as the entropic cost of cavity formation increases strongly with the size of the solute atom to insert whereas large atoms are better solvated than small ones. Considerations of thermodynamics show that the weight fraction of a noble gas in a silicate melt coexisting with its parent fluid at T and P is equal to n g c m /n m c g , where n g and n m are the densities of the two coexisting phases (gas and melt, respectively) and where the solubility parameters c m and c g express the probability of inserting the noble gas atom in the melt and in the parent fluid, respectively. The c m and c g decrease drastically when the pressure is increased and the noble gas solubility at high pressure is the result of a balance between these two quantities. Here again, the pressure behaviour of c m and c g is dominated by the pressure dependence of the entropic cost of cavity formation, the energetic contribution being of minor importance but not negligible at high pressures. With all melt composition investigated here (silica, rhyolite, MORB and olivine), the calculated solubility curves exhibit the same qualitative behaviour with pressure; a steep rise culminating in a broad maximum followed by a gradual decrease of the solubility at higher pressure. At variance with LHDAC experiments (Chamorro-Pérez et al., 1996Bouhifd et al., 2006Bouhifd et al., , 2008 where a Ar solubility drop is observed at about 50 kbar in silica and molten olivine and in the pressure range $100-160 kbar with other melt composition, we do not find such a sudden change of the solubility.

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“…In silicate-COH melt and fluid systems, the principal hydrogen-bearing species are H 2 O, OH, H 2, CH 4 , CH 3 , and HCO 3 where redox conditions and chemical composition of the fluids govern which species will dominate. The molecular species, H 2 O and H 2 , when present likely occupy 3-dimensional cavities in glass and melts much like that reported for noble gases, for example (Carroll and Stolper 1993;Zhang et al 2010;Guillot and Sator 2012). Hydrogen isotopes in those molecular species likely will not show significant fractionation effects.…”

Section: Hydrogen Isotopesmentioning

confidence: 70%

Redox-controlled mechanisms of C and H isotope fractionation between silicate melt and COH fluid in the Earth’s interior

Mysen

2018

Prog Earth Planet Sci

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The behavior of COH fluids, their isotopes (hydrogen and carbon), and their interaction with magmatic liquids are at the core of understanding formation and evolution of the Earth. Experimental data are needed to aid our understanding of how COH volatiles affect rock-forming processes in the Earth's interior. Here, I present a review of experimental data on structure of fluids and melts and an assessment of how structural factors govern hydrogen and carbon isotope partitioning within and between melts and fluids as a function of redox conditions, temperature, and pressure. The solubility of individual COH components in silicate melts can differ by several orders of magnitude and ranges from several hundred ppm to several wt%. Silicate solubility in fluid can reach several molecular at mantle temperatures and pressures. Different solubility of oxidized and reduced C-bearing species in melts reflects different solution equilibria. These equilibria are 2CH 4

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Interstitial voids in silica melts and implication for argon solubility under high pressures

Cited by 19 publications

References 46 publications

Xenon and Argon: A contrasting behavior in olivine at depth

Xenon and Argon: A contrasting behavior in olivine at depth

Noble gases in high-pressure silicate liquids: A computer simulation study

Redox-controlled mechanisms of C and H isotope fractionation between silicate melt and COH fluid in the Earth’s interior

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