“…Frictional heating and complex interactions between the slab and overriding plate were neglected for simplicity. The average thermal diffusivity κ during the slab descent was calculated based on literature data for thermal conductivity Λ Ol (Chang et al, 2017), density ρ Ol (Zhang & Bass, 2016), and specific heat capacity C P Ol (Su et al, 2018) of olivine (Table S12). As we focus on the impact of hydrous ringwoodite on the thermal evolution, we did not take into account any hydration reduction of Λ lat at this stage.…”
Section: Potential Impact On the Thermal Structure Of Subducting Slabsmentioning
The presence of water in minerals generally alters their physical properties. Ringwoodite is the most abundant phase in the lowermost mantle transition zone and can host up to 1.5–2 wt% water. We studied high‐pressure lattice thermal conductivity of dry and hydrous ringwoodite by combining diamond‐anvil cell experiments with ultrafast optics. The incorporation of 1.73 wt% water substantially reduces the ringwoodite thermal conductivity by more than 40% at mantle transition zone pressures. We further parameterized the ringwoodite thermal conductivity as a function of pressure and water content to explore the large‐scale consequences of a reduced thermal conductivity on a slab's thermal evolution. Using a simple 1‐D heat diffusion model, we showed that the presence of hydrous ringwoodite in the slab significantly delays decomposition of dense hydrous magnesium silicates, enabling them to reach the lower mantle. Our results impact the potential route and balance of water cycle in the lower mantle.
“…Frictional heating and complex interactions between the slab and overriding plate were neglected for simplicity. The average thermal diffusivity κ during the slab descent was calculated based on literature data for thermal conductivity Λ Ol (Chang et al, 2017), density ρ Ol (Zhang & Bass, 2016), and specific heat capacity C P Ol (Su et al, 2018) of olivine (Table S12). As we focus on the impact of hydrous ringwoodite on the thermal evolution, we did not take into account any hydration reduction of Λ lat at this stage.…”
Section: Potential Impact On the Thermal Structure Of Subducting Slabsmentioning
The presence of water in minerals generally alters their physical properties. Ringwoodite is the most abundant phase in the lowermost mantle transition zone and can host up to 1.5–2 wt% water. We studied high‐pressure lattice thermal conductivity of dry and hydrous ringwoodite by combining diamond‐anvil cell experiments with ultrafast optics. The incorporation of 1.73 wt% water substantially reduces the ringwoodite thermal conductivity by more than 40% at mantle transition zone pressures. We further parameterized the ringwoodite thermal conductivity as a function of pressure and water content to explore the large‐scale consequences of a reduced thermal conductivity on a slab's thermal evolution. Using a simple 1‐D heat diffusion model, we showed that the presence of hydrous ringwoodite in the slab significantly delays decomposition of dense hydrous magnesium silicates, enabling them to reach the lower mantle. Our results impact the potential route and balance of water cycle in the lower mantle.
“…Other formulations for the temperature-dependence of the thermal conductivity, heat capacity, and density than the ones described here are also available (e.g., Berman & Brown, 1985;Seipold, 1998;Wen et al, 2015;Su et al, 2018), but here we limit ourselves to the formulations described in this section to test the first-order e↵ect of such variability.…”
“…In contrast, laboratory experiments have shown that these parameters actually depend on temperature and can di↵er as much as a factor of 2 depending on the temperature (e.g., Berman, 1988;Berman & Aranovich, 1996;Seipold, 1998;A. Hofmeister, 1999;Xu et al, 2004;Wen et al, 2015;Su et al, 2018).…”
We study the e↵ect of temperature-dependent thermal conductivity, heat capacity, and density on simple subduction models• Using temperature-dependent thermal properties alters the modelled seismogenic zone size and location of dehydration reactions• Thermo(-mechanical) models of subduction zones should ideally include temperaturedependent thermal parameters
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.