Low Thermal Conductivity of Hydrous Phase D Leads to a Self‐Preservation Effect Within a Subducting Slab

Hsieh, Wen‐Pin; Marzotto, Enrico; Ishii, Takayuki; Dubrovinsky, Leonid; Aslandukovа, Alena; Criniti, Giacomo; Tsao, Yi‐Chi; Chun-Hung, Lin,; Tsuchiya, Jun; Ohtani, Eiji

doi:10.1029/2022jb024556

Cited by 11 publications

(21 citation statements)

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“…The results of this study and previous experiments (Chang et al., 2017; Hofmeister et al., 2006; Hsieh et al., 2022; Marzotto et al., 2020; B. Zhang, Ge, et al., 2019) demonstrate that water can effectively reduce the thermal conductivity of minerals. In the P‐T conditions of the MTZ, 0.81 wt.% water reduces the thermal conductivity of wadsleyite by ∼10%, and 0.47 wt.% water reduces the thermal conductivity of ringwoodite by ∼10% (Marzotto et al., 2020).…”

Section: Discussionsupporting

confidence: 74%

“…The results of this study and previous experiments (Chang et al, 2017;Hofmeister et al, 2006;Hsieh et al, 2022;Marzotto et al, 2020;B. Zhang, Ge, et al, 2019) demonstrate that water can effectively reduce the thermal conductivity of minerals.…”

Section: Influence On the Temperature Of Slabs: Implications For Wate...supporting

confidence: 78%

“…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).…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Discussionsupporting

confidence: 74%

Section: Influence On the Temperature Of Slabs: Implications For Wate...supporting

confidence: 78%

Section: Introductionmentioning

confidence: 99%

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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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“…Figure 1(b) describes the temperature dependence of Λ of Al-garnets at a fixed pressure and 300-773 K. Though our measurement temperature was increased to only 773 K, clear and consistent dependences among these Al-garnets were observed. As expected, the Λ of all three Algarnets decreases with temperature, a typical behavior of mantle silicate minerals (Xu et al 2004;Hsieh et al 2018Hsieh et al , 2022bY. Zhang et al 2019).…”

Section: Resultssupporting

confidence: 81%

“…Such crucial property of garnets, however, had only been studied at relatively low pressure and a wide range of temperature conditions, see, e.g., (Horai 1971;Slack and Oliver 1971;Osako et al 2004;Hofmeister 2006;Marquardt et al 2009;Hofmeister and Branlund 2015). As a result, previous numerical modellings on the dynamics of the mantle and slab subduction have often assumed that the thermal conductivity of garnets along relevant high P-T conditions is either a constant (Davies 1988;Eberle et al 2002) or that of olivine (Hsieh et al 2022a(Hsieh et al , 2022b, which may lead to incomplete understanding of the thermochemical state and evolution in Earth's interior. A systematic study on the thermal conductivity of Al-garnets with representative chemical compositions under P-T conditions relevant to the pyrolitic mantle and subducting slabs is therefore critically needed.…”

Section: Introductionmentioning

confidence: 99%

Thermal conductivity of aluminous garnets in Earth’s deep interior

Hung,

Tsao,

Lin

et al. 2024

American Mineralogist

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Aluminous garnets [(Mg,Fe,Ca) 3 Al 2 (SiO 4 ) 3 ] are a key mineral group in Earth's interior. Their thermal conductivity under relevant chemical compositions and high pressure-temperature (P-T) conditions plays a crucial role in affecting the thermal states of pyrolitic mantle and subducted basaltic crust over the depth range they are present. Using ultrafast optical pump-probe spectroscopy combined with an externally-heated diamond anvil cell, we have precisely determined the high P-T thermal conductivity of aluminous garnets, including pyrope, grossular, and pyrope-almandine solid solution. We find that the variable chemical composition has minor effects on the thermal conductivity of these garnets over the P-T range we studied. Combined with previous results, we provide new depth-dependent thermal conductivity profiles for a pyrolitic mantle and a subducted basaltic crust. These important results significantly benefit geodynamics simulations and advance our understanding of the thermal structure and evolution dynamics in Earth's upper mantle and transition zone. In addition, as garnets are also a key, useful material family for modern technology, our results on the thermal property of natural garnets also shed lights on the novel design of optical and electronic devices based on a variety of synthetic nonsilicate garnets.

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Exceptionally Low Thermal Conduction of Basaltic Glasses and Implications for the Thermo‐Chemical Evolution of the Earth's Primitive Magma Ocean

Hsieh,

Chang,

Tsao

et al. 2024

JGR Solid Earth

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The thermal properties of the Earth's primordial magma are the key factors that constrained crystallization and other thermo‐chemical processes in Earth's primitive magma ocean and therefore controlled the Earth's long‐term evolution. Thermal conductivity of the primordial magma is conventionally assumed to be a constant of about 4 W m−1 K−1 under the high pressure‐temperature conditions of the primitive magma ocean. Here we measured the lattice thermal conductivity of a variety of basaltic and silicate glasses at high pressures and a wide range of temperatures. Our results suggest that the primordial magma, if it is indeed represented by basaltic melts, had a thermal conductivity of ∼1.0–1.9 W m−1 K−1, much lower than previously thought. Such low thermal conduction reduced heat loss and thus prolonged the cooling time of the early magma ocean, promoting convection in the solidifying mantle and preventing a global overturn. Moreover, if the seismic ultralow velocity zones presently observed in the lowermost mantle are made of basaltic melts, originating either from remnants of the primitive magma ocean or pieces of subducted crust, the material in these zones must have an ultralow thermal conductivity, which would reduce cooling and thus influence the thermo‐chemical evolution of the present day core‐mantle boundary.

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Low Thermal Conductivity of Hydrous Phase D Leads to a Self‐Preservation Effect Within a Subducting Slab

Abstract: Subduction of oceanic lithosphere can bring water embedded within hydrous minerals into Earth's interior, which would affect physical and chemical properties, rheology, geodynamics, and thermo-chemical evolution of our planet (

Cited by 11 publications

References 89 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

Thermal conductivity of aluminous garnets in Earth’s deep interior

Exceptionally Low Thermal Conduction of Basaltic Glasses and Implications for the Thermo‐Chemical Evolution of the Earth's Primitive Magma Ocean

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