2018
DOI: 10.1016/j.gca.2017.10.028
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New constraints on Xe incorporation mechanisms in olivine from first-principles calculations

Abstract: International audienceStorage of Xe at depth in silicate minerals has recently been proposed to explain the low Xe abundance in the Earth’s and Mars’ atmospheres compared to other noble gases (the so-called ‘Missing Xenon’ issue). Evidences for incorporation, and thus reactivity of Xe in olivine at high pressure and high temperature are based on variations in cell parameters and the appearance of a new Raman band. To constrain the, so far only hypothetical, Xe incorporation mechanism in olivine, we theoretical… Show more

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Cited by 17 publications
(37 citation statements)
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“…The significantly smallest excess volume is obtained in the case of Xe for Si substitution, with even a decrease at 0 GPa and for 0.41 at% Xe. In line with our previous study on Xe‐bearing olivine (Crépisson et al, ), this small excess volume and the formation energies suggest that Xe for Si substitution is the likeliest Xe incorporation mechanism in quartz.…”
Section: Resultssupporting
confidence: 91%
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“…The significantly smallest excess volume is obtained in the case of Xe for Si substitution, with even a decrease at 0 GPa and for 0.41 at% Xe. In line with our previous study on Xe‐bearing olivine (Crépisson et al, ), this small excess volume and the formation energies suggest that Xe for Si substitution is the likeliest Xe incorporation mechanism in quartz.…”
Section: Resultssupporting
confidence: 91%
“…As reported for olivine (Crépisson et al, ; Sanloup et al, ), the unit cell volume of quartz is systematically larger by up to 4.2%, in the presence of Xe, than the volume predicted by the equations of state of plain quartz based on in situ X‐ray diffraction data from both XRD1 and XRD2 data sets (Table ). The presence of Ar is unlikely to affect the unit cell volume of quartz as Ar is classically used as a P ‐transmitting medium.…”
Section: Resultssupporting
confidence: 58%
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“…Recent experimental studies propose that missing Xe might be stored inside silicate structures in the deep Earth (Crépisson et al 2018;Crépisson et al 2019;Sanloup 2005 (Pepin 1991). This Xe component has been nicknamed U-Xe and has resisted decades of investigation (Pepin 1994 Fig.…”
Section: The Long-standing Xenon Paradoxmentioning
confidence: 99%