DOI: 10.1016/j.epsl.2017.12.019
Scopus记录号: 2-s2.0-85038206814
论文题名: Bonding of xenon to oxygen in magmas at depth
作者: Leroy C. ; Sanloup C. ; Bureau H. ; Schmidt B.C. ; Konôpková Z. ; Raepsaet C.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2018
卷: 484 起始页码: 103
结束页码: 110
语种: 英语
英文关键词: high pressure
; silicate melt
; x-ray diffraction
; xenon
Scopus关键词: Atmospheric chemistry
; Chemical bonds
; Distribution functions
; Inert gases
; Iron alloys
; Isotopes
; O rings
; Silica
; Silicates
; Solubility
; X ray diffraction
; Electron microprobes
; High pressure
; High-energy synchrotron X-rays
; Inter-atomic distances
; Pair distribution functions
; Pressure-temperature conditions
; Silicate melts
; Solubility measurement
; Xenon
; alloy
; atmospheric chemistry
; high pressure
; magma
; oxygen
; silicate melt
; X-ray diffraction
; xenon
英文摘要: The field of noble gases chemistry has witnessed amazing advances in the last decade with over 100 compounds reported including Xe oxides and Xe–Fe alloys stable at the pressure-temperature conditions of planetary interiors. The chemistry of Xe with planetary materials is nonetheless still mostly ignored, while Xe isotopes are used to trace a variety of key planetary processes from atmosphere formation to underground nuclear tests. It is indeed difficult to incorporate the possibility of Xe reactivity at depth in isotopic geochemical models without a precise knowledge of its chemical environment. The structure of Xe doped hydrous silica-rich melts is investigated by in situ high energy synchrotron X-ray diffraction using resistive heating diamond anvil cells. Obtained pair distribution functions reveal the oxidation of Xe between 0.2 GPa and 4 GPa at high T up to 1000 K. In addition to the usual interatomic distances, a contribution at 2.05 ± 0.05 Å is observed. This contribution is not observed in the undoped melt, and is interpreted as the Xe–O bond, with a coordination number of about 12 consistent with Xe insertion in rings of the melt structure. Xe solubility measurements by electron microprobe and particle induced X-rays emission analysis confirm that Xe and Ar have similar solubility values in wt% in silicate melts. These values are nonetheless an order of magnitude higher than those theoretically calculated for Xe. The formation of Xe–O bonds explains the enhanced solubility of Xe in deep continental crust magmas, revealing a mechanism that could store Xe and fractionate its isotopes. Xenon is indeed atypical among noble gases, the atmosphere being notably depleted in elemental Xe, and very strongly depleted in Xe light isotopes. These observations are known as the ‘missing’ Xe paradox, and could be solved by the present findings. © 2017 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/110053
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
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作者单位: Sorbonne Universités, UPMC Univ Paris 06, CNRS, Institut de Minéralogie, de Physique des matériaux et de Cosmochimie, Paris, 75005, France; Sorbonne Universités, UPMC Univ Paris 06, CNRS, Institut des Sciences de la Terre de Paris, Paris, 75005, France; Goettingen University, Geowissenschaftliches Zentrum, Goettingen, 37077, Germany; DESY Photon Science, Notkestr. 85, Hamburg, 22607, Germany; NIMBE, CEA, CNRS, Université Paris-Saclay, CEA Saclay, Gif-sur-Yvette, 91191, France
Recommended Citation:
Leroy C.,Sanloup C.,Bureau H.,et al. Bonding of xenon to oxygen in magmas at depth[J]. Earth and Planetary Science Letters,2018-01-01,484