Some mineral physics constraints on the rheology and geothermal structure of Earth’s lower mantle

By D. Yamazaki, S. Karato. 2001

310 citations recorded by the source corpus.

View Paper: https://www.semanticscholar.org/paper/3b3fef78a5cbb66640a704537784ee1a8dd845b6

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In Geophysics

Citations in the corpus

Dynamics and evolution of the deep mantle resulting from thermal, chemical, phase and melting effects (2012, methodology): “In the regional model (left panel), a reasonable variation of material properties with depth is assumed as given in Tackley (2002), with a viscosity variation with temperature and pressure based on Yamazaki and Karato (2001) and a value of 1022 Pa.s just above the lower thermal boundary layer.”
Modelling post-glacial rebound with lateral viscosity variations (2005, methodology): “(b) Use the relation η(r) = A0 exp[γ T m (r )/T (r)], with γ = 17 in the upper mantle and γ = 10 in the lower mantle (Yamazaki & Karato 2001) (as used in McNamara et al. 2003).”
Hotspots, mantle plumes and core heat loss (2002, background): “However, inferring large radial variations of the viscosity from models that do not allow lateral variations [40] is highly questionable [41] since viscosity is thought to vary by several orders of magnitude with temperature but only mildly with pressure [42] in the absence of chemical strati¢cation”
Models of large‐scale viscous flow in the Earth's mantle with constraints from mineral physics and surface observations (2006, methodology): “Yamazaki & Karato (2001) consider using the melting curves of these constituents—which both look similar— appropriate.”
Post‐perovskite phase transition and mineral chemistry in the pyrolitic lowermost mantle (2005, background): “Yamazaki and Karato [2001] suggested that Mw occurs as continuous films after large shear strains in a convection boundary layer such as D 00 region.”
Rheology of the Earth's mantle: A historical review (2010, methodology): “In contrast, in a more recent approach by Yamazaki and Karato (2001b), they first used the observed lack of seismic anisotropy in the lower mantle as evidence for diffusion creep.”
Strong heterogeneity caused by deep mantle layering (2002, background): “According to best estimates [Yamazaki and Karato, 2001] the total activation enthalpy H* (i.e., including both the activation energy and activation volume terms) is at least 450 kJ/mol for diffusion creep in the lower 1000 km of the mantle, so a temperature change from 2500 to 3500 Kwould give a…”
Persistence of strong silica-enriched domains in the Earth’s lower mantle (2016, background): “An initial global lower-mantle SiO2-enrichment compatible with our model starting conditions could arise due to (1) incomplete equilibration of the proto-mantle during multi-stage core formation(41), (2) fractionation during magma-ocean crystallization(42), and/or (3) continental extraction that lea”
Plate tectonics on super-Earths: Equally or more likely than on Earth (2011, background): “Viscosity is generally thought to increase with pressure (e.g. Ammann et al., 2009; Yamazaki and Karato, 2001) although at higher pressures it might start to decrease with pressure due to a change in creep mechanism (Karato, 2011).”