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; Song, Jian; Deng, Xin

doi:10.46427/gold2022.10858

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“…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

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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 (

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