Elastic properties of Fe-bearing Akimotoite at mantle conditions: Implications for composition and temperature in lower mantle transition zone

Zhao, Yong; Wu, Zhongqing; Hao, Shangqin; Wang, Wenzhong; Deng, Xin; Song, Jian

doi:10.1016/j.fmre.2021.12.013

Cited by 10 publications

(5 citation statements)

References 66 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Hence, the thermal conductivity of the minerals in the slab is the critical parameter for understanding its thermal structure. Olivine and its high‐pressure polymorphs (wadsleyite and ringwoodite) constitute ∼60% of the upper mantle and the MTZ (Frost, 2008; Ringwood, 1991; Zhao et al., 2022), and ∼80% of the harzburgitic slab (Irifune & Ringwood, 1987). Many studies have proposed that subducting slabs can transport water to the MTZ (He, 2017; Kuritani et al., 2011; Ohtani et al., 2004; Z. Wang, Kusky, & Capitanio, 2018; X.‐C.…”

Section: Introductionmentioning

confidence: 99%

Thermal Conductivity of Hydrous Wadsleyite Determined by Non‐Equilibrium Molecular Dynamics Based on Machine Learning

Wang

Deng

2022

Geophysical Research Letters

Self Cite

View full text Add to dashboard Cite

Subduction of slabs couples the Earth's interior with its exterior, and powers the unique plate tectonics on our planet. The temperature of the slabs controls a series of subduction processes. Slab temperature influences the composition and the density of subducting slabs, which determines the fate of the slabs (Ganguly et al., 2009;Litasov et al., 2004). Low temperature can kinetically inhibit the gradual dissolution of pyroxene into garnet (Nishi et al., 2013;van Mierlo et al., 2013), which plays a critical role for the stagnation of the relative cold slabs above the depth of 660 km (King et al., 2015) because pyroxene is less dense than majoritic garnet. The phase transformations of the surviving pyroxene and pyrope could account for multiple discontinuities at the depths of ∼600-750 km in some cold subduction zones such as Northeast China and Tonga (Ai et al., 2003;Deuss et al., 2006;Zang et al., 2006). Temperature also controls slab devolatilization and affects the component of arc magma and the amount of volatiles recycling to the surface (Hsieh et al., 2022;Rüpke et al., 2004;van Keken et al., 2011). The partition coefficients of key elements that define arc geochemical signatures also exhibit strong temperature dependence (Kessel et al., 2005). The thermal structure of the slabs is believed to have a large effect on seismicity (

show abstract

Section: Introductionmentioning

confidence: 99%

Thermal Conductivity of Hydrous Wadsleyite Determined by Non‐Equilibrium Molecular Dynamics Based on Machine Learning

Wang

Deng

2022

Geophysical Research Letters

Self Cite

View full text Add to dashboard Cite

show abstract

“…This method only needs the VDos of the unstrained configuration to obtain high-T elasticity, significantly reducing the computational workload to less than 10% of the conventional methods while maintaining high accuracy. This method has been applied successfully to many minerals (Deng et al, 2022(Deng et al, , 2023Duan et al, 2019;Hao et al, 2019;Wang et al, 2020;Wu & Wang, 2016;Zhao et al, 2022). Additionally, the phase boundary was determined by comparing the Gibbs free energy of the reactant and the product, which is directly deduced from F from…”

Section: Methodsmentioning

confidence: 99%

“…This method has been applied successfully to many minerals (Deng et al., 2022, 2023; Duan et al., 2019; Hao et al., 2019; Z. J. Song et al., 2022; Wang et al., 2020; Wu & Wang, 2016; Zhao et al., 2022). Additionally, the phase boundary was determined by comparing the Gibbs free energy of the reactant and the product, which is directly deduced from F from G ( P , T ) = F ( V , T ) + P ( V , T ) V .…”

Section: Methodsmentioning

confidence: 99%

Elasticity of Anhydrous Phase B Under Mantle Conditions: Implications for the Deep X‐Discontinuity in the Subduction Zones

Song,

Wang,

2023

Geochem Geophys Geosyst

Self Cite

View full text Add to dashboard Cite

Anhydrous phase B (anh‐B) is a dense magnesium silicate with the composition Mg14Si5O24 and space group Pmcb. In magnesium‐rich environments, forsterite reacts with periclase to form anh‐B, and the formation of anh‐B was proposed as a plausible mechanism for the origin of the X‐discontinuity. However, the elastic properties of anh‐B, which are critical for evaluating the seismic features associated with its formation, have not been determined. In this study, we investigated the elasticity of anh‐B at high pressure and temperature via first‐principles calculations. Combining with the elasticity of other minerals, we determined the contrasts caused by the formation of anh‐B: ∼3%, ∼7%, and ∼10% jumps for density, VP, and VS, respectively. The 2%–8% impedance contrasts of the X‐discontinuity can be explained by the formation of 15–60 vol% anh‐B, which requires 3–12 vol% MgO as a reactant.

show abstract

“…The method derives the analytical expression of the second derivative in Equation (1) and avoids the vibrational calculations of strained configurations. This method only requires one‐tenth of the computation workloads of the usual method without losing accuracy (e.g., Deng et al., 2022; Duan et al., 2019; Hao et al., 2019; Wang et al., 2020; Zhao et al., 2022; Zou et al., 2018).…”

Section: Methodsmentioning

confidence: 99%

Elasticity of Phase H Under the Mantle Temperatures and Pressures: Implications for Discontinuities and Water Transport in the Mid‐Mantle

Song

Wang

et al. 2022

JGR Solid Earth

Self Cite

View full text Add to dashboard Cite

show abstract

Elastic properties of Fe-bearing Akimotoite at mantle conditions: Implications for composition and temperature in lower mantle transition zone

Cited by 10 publications

References 66 publications

Thermal Conductivity of Hydrous Wadsleyite Determined by Non‐Equilibrium Molecular Dynamics Based on Machine Learning

Thermal Conductivity of Hydrous Wadsleyite Determined by Non‐Equilibrium Molecular Dynamics Based on Machine Learning

Elasticity of Anhydrous Phase B Under Mantle Conditions: Implications for the Deep X‐Discontinuity in the Subduction Zones

Elasticity of Phase H Under the Mantle Temperatures and Pressures: Implications for Discontinuities and Water Transport in the Mid‐Mantle

Contact Info

Product

Resources

About