Argon storage and diffusion in Earth’s upper mantle

Delon, Rémi; Demouchy, Sylvie; Marrocchi, Yves; Bouhifd, Mohamed Ali; Addad, Ahmed; Burnard, Pete

doi:10.1016/j.gca.2019.03.007

Cited by 9 publications

(3 citation statements)

References 127 publications

(118 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Nobles gases are inert at room conditions, but, at the high pressures and temperatures of Earth's interior, distortion of their electron clouds (polarization) allows them to bond with ions in silicates (e.g., Hiyagon and Ozima, 1986), and olivine can incorporate trace amounts of He, Ne, Ar, Kr, and Xe (e.g., Valbracht et al, 1996;Trull et al, 1991;Brooker et al, 2003;Parman et al, 2005;Tolstikhin et al, 2010;Sanloup et al, 2011;Moirera and Kurz, 2013;Burnard et al, 2015;Delon et al, 2018Delon et al, , 2019. Noble gas ionic radii from Zhang and Xu (1995) are included in Fig.…”

Section: Anions and Noble Gasesmentioning

confidence: 99%

“…5. Although interstitial sites are a valid hypothetical mechanism of noble gas incorporation, recent studies have shown that He and Ar can also occupy Me vacancies (Delon et al, 2018(Delon et al, , 2019 and Xe is more likely to occupy Si vacancies (e.g., Sanloup et al, 2011).…”

Section: Anions and Noble Gasesmentioning

confidence: 99%

“…In addition, analyses of noble gas incorporation have important implications for geochronology and Earth's history ( 3 He; e.g., Trull et al, 1991). The most notable contributions (Dukes et al, 1999;Deloule and Robert, 1995) have demonstrated the effective intake of H + and helium (as He + ) into chondritic olivines via the irradiation of their surfaces by solar wind. As expected, the addition of surfactants im-pacts the electric charge of the free surface, and achieving electroneutrality minimizes interfacial tension.…”

Section: Free Surfacesmentioning

confidence: 99%

See 2 more Smart Citations

Defects in olivine

Demouchy¹

2021

Eur. J. Mineral.

Self Cite

View full text Add to dashboard Cite

Abstract. Olivine, a ferromagnesian orthosilicate, is the most abundant mineral in Earth's upper mantle and is stable down to the olivine–wadsleyite phase transition, which defines the 410 km depth mantle transition zone. Olivine also occurs in crustal environments in metamorphic and hydrothermal rocks and is expected to be the major mineral constituent of the Martian and Venusian mantles. The olivine atomic structure is also used in materials science to manufacture lithium batteries. Like any other crystalline solid, including minerals, olivine never occurs with a perfect crystalline structure: defects in various dimensions are ubiquitous, from point, line, and planar defects to three-dimensional (3-D) inclusions. In this contribution, I review the current state of the art of defects in olivine and several implications for key processes occurring in Earth's mantle. Intrinsic and extrinsic point defects are detailed, exemplifying the astonishing diversity of atomic impurities in mantle-derived olivine. Linear defects, one of the key defect types responsible for ductile deformation in crystalline solids, are examined in light of recent progress in 3-D transmission electron microscopy, which has revealed an important diversity of dislocation slip systems. I summarize the principal characteristics of interface defects in olivine: the free surface, grain and interface boundaries, and internal planar defects. As the least-studied defects to date, interface defects represent an important challenge for future studies and are the main application of numerical simulation methods in materials science. I provide an overview of melt, fluid, and mineral inclusions, which are widely studied in volcanology and igneous petrology. Special attention is given to new crystalline defects that act as deformation agents: disclinations (rotational defects) and the potential occurrence of disconnections in olivine, both of which are expected to occur along or near grain boundaries. Finally, I detail outstanding questions and research directions that will further our understanding of the crystalline specificities and paradoxes of olivine and olivine-rich rocks and ultimately their implications for the dynamics of Earth's upper mantle.

show abstract

Section: Anions and Noble Gasesmentioning

confidence: 99%

Section: Anions and Noble Gasesmentioning

confidence: 99%

Section: Free Surfacesmentioning

confidence: 99%

See 1 more Smart Citation

Defects in olivine

Demouchy¹

2021

Eur. J. Mineral.

Self Cite

View full text Add to dashboard Cite

show abstract

Hydrogen, trace, and ultra-trace element distribution in natural olivines

Demouchy

Alard

2021

Contrib Mineral Petrol

Self Cite

View full text Add to dashboard Cite

We investigate the coupling between H, minor, trace, and ultra-trace element incorporations in 17 olivines from ten different locations covering various petrological origins: magmatic, hydrothermal and mantle-derived context. Concentrations in major element are determined by micro X-ray fluorescence. Minor, trace, and ultra-trace element are determined by laser ablation inductively coupled plasma mass spectrometry. Hydrogen concentrations are quantified using unpolarized and polarized Fourier transform infrared spectroscopy (FTIR). Forsterite contents (83.2 to 94.1 %) reflect the petrogenetic diversity. Hydrogen concentrations range from 0 to 54 ppm H2O wt. Minor element concentrations (Ni + Mn) range from 3072 to 4333 ppm, and impurities are dominated by Ni, Mn, Ca or B. Total trace element concentrations range from 8.2 to 1473 ppm. Total rare Earth and extended ultra-trace elements concentrations are very low (< 0.5 ppm). Magmatic and hydrothermal olivines show the most and least amount of impurities, respectively, and mantle-derived olivines have concentrations between these two extremes. Combined with minor, trace, and ultra-trace element concentrations, the hydrogen concentrations and FTIR OH bands reflect the point defect diversity imposed by different geological settings. Hydrogen concentrations are inversely correlated with divalent impurities,indicating their competition for vacancies. However, a broad positive correlation is also found between OH bands at 3575 and 3525 cm -1 and Ti, confirming the existence of Ti-clinohumitelike point defect in mantle olivines. Nonetheless, Ti does not exclusively control hydrogen incorporation in olivine due to the co-existence with other mechanisms, and its effect appears diluted. Our results confirm that hydrogen behaves as a peculiar incompatible element, and furthermore as an opportunistic impurity in olivine.

show abstract

The geochemical concept of a “Primitive Mantle”

Stracke

2025

Treatise on Geochemistry

View full text Add to dashboard Cite

Argon storage and diffusion in Earth’s upper mantle

Cited by 9 publications

References 127 publications

Defects in olivine

Defects in olivine

Hydrogen, trace, and ultra-trace element distribution in natural olivines

The geochemical concept of a “Primitive Mantle”

Contact Info

Product

Resources

About