The effect of fluorine on the stability of wadsleyite: Implications for the nature and depths of the transition zone in the Earth's mantle

Grützner, Tobias; Klemme, Stephan; Rohrbach, Arno; Gervasoni, Fernanda; Berndt, Jasper

doi:10.1016/j.epsl.2017.11.011

Cited by 23 publications

(11 citation statements)

References 51 publications

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“…It is well known that the mantle is a major water reservoir in the Earth because of the storage of hydrogen defects in nominally anhydrous mantle minerals such as olivine (e.g., Bell and Rossman 1992;Pearson et al 2014). Recent studies have also indicated that the mantle has acted as a reservoir for F (e.g., Beyer et al 2016;Grützner et al 2018;Yoshino and Jaseem 2018). A close association between F and OH has been demonstrated via their coupled incorporation mechanism in olivine (Crépisson et al 2014).…”

Section: Discussionmentioning

confidence: 99%

Impact of fluorine on the thermal stability of phlogopite

Sun¹,

Yang²,

Ingrin

et al. 2022

American Mineralogist

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Knowledge of volatile cycling is vital to understand evolution of the planet and the life it supports. Although it is gradually accepted that the mantle is a vast store house of H 2 O and other volatiles, the impact of co-existing volatiles on the thermal stabilities of OH and the lattice of the host mineral is still poorly understood.Phlogopite is one of the few hydrous minerals capable of carrying both water and halogens into the mantle. Previous observations from both experiments and textural relationships in natural samples have indicated that F-rich phlogopite can be stable under ultra-high-temperature conditions. Here, the impact of F on the thermal stability of phlogopite was investigated via XRD, Raman, and IR spectroscopy from room temperature to 1000 to 1200 °C. Based on the experimental results from a F-poor and a F-rich natural phlogopites, we show that about 4 wt% F can increase the breakdown temperature of phlogopite by 100 °C under ambient pressure. The impact mechanism mainly involves preventing OH and lattice softening at high temperatures. This study reveals the links between F and the behavior of OH and phlogopite lattice, which is important for constraining volatile cycling as well as F's role in the physical and chemical properties of the upper mantle.

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Section: Discussionmentioning

confidence: 99%

Impact of fluorine on the thermal stability of phlogopite

Sun¹,

Yang²,

Ingrin

et al. 2022

American Mineralogist

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“…High-pressure high-temperature decomposition of (NH4)2[Os0.40Pt0.60Cl6] at 1 GPa has been performed in an end-loaded piston cylinder apparatus installed at the Institut für Mineralogie, WWU Münster [17]. (NH4)2[Os0.40Pt0.60Cl6] powder was enclosed in a 2 mm alumina crucible.…”

Section: Methodsmentioning

confidence: 99%

“…10/4 assemblies were used with chromium-doped MgO octahedra, stepped LaCrO3 furnaces and pyrophyllite gaskets. The assembly was pressure-calibrated at high temperatures using olivine-wadsleyite-ringwoodite phase transitions [17]. The starting powders were encapsulated into polycrystalline crushable Al2O3 containers.…”

Section: Methodsmentioning

confidence: 99%

Equations of state of rhodium, iridium and their alloys up to 70 GPa

Yusenko

Khandarkhaeva

Fedotenko

et al. 2019

Journal of Alloys and Compounds

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Thermal decomposition of (NH4)2[OsxPt1-xCl6] as single-source precursors for Os-Pt binary alloys has been investigated under ambient and high pressure up to 40 GPa. Thermal decomposition of mixed-metal (NH4)2[OsxPt1-xCl6] precursor in hydrogen atmosphere (reductive environment) under ambient pressure results in formation of β-trans-[Pt(NH3)2Cl2] and α-trans-[Pt(NH3)2Cl2] crystalline intermediates as well as single and twophase Os-Pt binary alloys. For the first time, direct thermal decomposition of coordination compound under pressure has been investigated. A formation of pure metallic alloys from single-source precursors under pressure has been shown. Miscibility between fccand hcpstructured alloys has been probed up to 50 GPa by in situ high-pressure X-ray diffraction. Miscibility gap between fccand hcp-structured alloys does not change its positions with pressure up to at least 50 GPa.

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“…American Mineralogist, in press. DOI: https://doi.org/10.2138/am-2019-6694 mantle minerals in transition zone (Grützner et al, 2018). Substitution of OH-1 by fluorine (F -) occurs in natural minerals including topaz and recent study shows that such substitution does indeed influence the bulk sound velocity (Tennakoon et al, 2018).…”

Section: Discussionmentioning

confidence: 99%

Anomalous elastic behavior of phase Egg, AlSiO3(OH), at high pressures

2018

msam

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Phase Egg (AlSiO 3 (OH)), is an aluminosilicate hydrous mineral that is thermodynamically stable in lithological compositions represented by Al 2 O 3-SiO 2-H 2 O (ASH) ternary i.e., a simplified ternary for the mineralogy of subducted sediments and continental crustal rocks. High-pressure and high-temperature experiments on lithological compositions resembling hydrated sedimentary layers in subducting slabs show that phase Egg is stable up to pressures of 20-30 GPa which translates to transition zone to lower mantle depths. Thus phase Egg is a potential candidate for transporting water into the Earth's mantle transition zone. In this study, we use first-principles simulations based on density functional theory to explore the pressure dependence of crystal structure and how it influences energetics and elasticity. Our results indicate that phase Egg exhibits anomalous behavior of the pressure dependence of the elasticity at mantle transition zone depths (~ 15 GPa). Such anomalous behavior in the elasticity is related to changes in the This is a preprint, the final version is subject to change, of the American Mineralogist (MSA) Cite as Authors (Year) Title. American Mineralogist, in press.

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The effect of fluorine on the stability of wadsleyite: Implications for the nature and depths of the transition zone in the Earth's mantle

Cited by 23 publications

References 51 publications

Impact of fluorine on the thermal stability of phlogopite

Impact of fluorine on the thermal stability of phlogopite

Equations of state of rhodium, iridium and their alloys up to 70 GPa

Anomalous elastic behavior of phase Egg, AlSiO3(OH), at high pressures

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The effect of fluorine on the stability of wadsleyite: Implications for the nature and depths of the transition zone in the Earth's mantle

Cited by 23 publications

References 51 publications

Impact of fluorine on the thermal stability of phlogopite

Impact of fluorine on the thermal stability of phlogopite

Equations of state of rhodium, iridium and their alloys up to 70 GPa

Anomalous elastic behavior of phase Egg, AlSiO3(OH), at high pressures

Contact Info

Product

Resources

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Equations of state of rhodium, iridium and their alloys up to 70 GPa