Effect of composition, structure, and spin state on the thermal conductivity of the Earth's lower mantle

Goncharov, Alexander F.; Struzhkin, Viktor V.; Montoya, Javier A.; Kharlamova, S. A.; Kundargi, R.; Siebert, J.; Badro, James; Antonangeli, Daniele; Ryerson, Frederick J.; Mao, Wendy L.

doi:10.1016/j.pepi.2010.02.002

Cited by 49 publications

(48 citation statements)

References 33 publications

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“…2000-25000 cm −1 ) (Clark, 1957a(Clark, , 1957bHofmeister, 2004Hofmeister, , 2005Shankland et al, 1979;Fukao et al, 1968;Goncharov et al, 2008Goncharov et al, , 2009aGoncharov et al, , 2006Goncharov et al, , 2010Goncharov et al, , 2015Keppler and Smyth, 2005;Keppler et al, 2007Keppler et al, , 2008Thomas et al, 2012;Murakami et al, 2014) to allow using the room temperature absorption coefficient in the absence of high-temperature absorption data. Our results are at odds with this assumption because optical properties of Fe-bearing minerals appear sensitive to high temperature.…”

Section: Radiative Thermal Conductivity Of the Spin Transition Zonementioning

confidence: 99%

“…Soon it was realized that optical properties of minerals themselves are highly dependent on temperature and pressure; thus, these must be addressed at relevant mantle conditions. Diamond anvil cells (DACs) have previously been employed to study variations in visible and near-IR absorption at high pressure, but at room temperature (Goncharov et al, , 2009a(Goncharov et al, , 2006(Goncharov et al, , 2010Keppler and Smyth, 2005;Keppler et al, 2007Keppler et al, , 2008; Mao and Bell, 1972 temperature studies at near-ambient pressures were not conclusive (Shankland et al, 1979;Fukao et al, 1968;Taran et al, 2009;Sung et al, 1977;Ullrich et al, 2002). More recently, examining optical properties of minerals in resistively-heated DACs helped understand the combined effect of pressure and temperature, but the results are scarce and limited to T < 900 K Thomas et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

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Reduced radiative conductivity of low spin FeO6-octahedra in FeCO3 at high pressure and temperature

Lobanov

Holtgrewe

Goncharov

2016

Earth and Planetary Science Letters

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Section: Radiative Thermal Conductivity Of the Spin Transition Zonementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Reduced radiative conductivity of low spin FeO6-octahedra in FeCO3 at high pressure and temperature

Lobanov

Holtgrewe

Goncharov

2016

Earth and Planetary Science Letters

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“…Heat transfer within the DAC was simulated numerically by solving for the 213 transient heat equation with appropriate boundary conditions using a finite element 214 method (Beck et al, 2007;Goncharov et al, 2009a;Goncharov et al, 2010;215 Goncharov et al, 2012c;Konopkova et al, 2011;Montoya and Goncharov, 2012). 216…”

Section: Finite-element Modelling 212mentioning

confidence: 99%

“…and planetary properties such as magnetic fields (Goncharov et al, 2009a;Goncharov 43 et al, 2015;Goncharov et al, 2010;Olson, 2013;Pozzo et al, 2012;Zhang et al, 44 2015). Efforts to constrain the transport properties of materials under extreme 45 conditions require an understanding of the physical processes involved, which has 46 been particularly elusive in the case of metals such as iron 47 7 In a given spectrogram, emission was measured from either side of the foil or 150 from both sides simultaneously using color filtering to split the spectral window (165 151 nm range) to include emission from both sides.…”

Section: Introduction 40mentioning

confidence: 99%

A flash heating method for measuring thermal conductivity at high pressure and temperature: Application to Pt

McWilliams

Konôpková

Goncharov

2015

Physics of the Earth and Planetary Interiors

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20 21The transport properties of matter at high pressure and temperature are critical 22 components in planetary interior models, yet are challenging to measure or predict at 23 relevant conditions. Using a novel flash-heating method for in-situ high-temperature 24 and high-pressure thermal conductivity measurement, we study the transport 25 2 properties of platinum to 55 GPa and 2300 K. Experimental data reveal a simple high-26 pressure and high-temperature behavior of the thermal conductivity that can be 27 described as linear in both pressure and temperature. The corresponding electrical 28 resistivity evaluated through the Wiedemann-Franz-Lorenz law is nearly constant 29 along the melting curve, experimentally confirming the prediction of Stacey for an 30 ideal metal. This study together with prior first-principles predictions of transport 31 properties in Al and Fe at extreme conditions suggests a broad applicability of 32 Stacey's law to diverse metals, supporting a limit on the thermal conductivity of iron 33 at the conditions of Earth's outer core of 90 W/mK or less. 34 35

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“…According to this profile, k is assumed to increase by a factor of 3 across the mantle, implying a thermal conductivity of about 10 W/mK near the core-mantle boundary (CMB). Although no conclusive agreement has been reached on the exact values that the total lattice thermal conductivity takes at lower-mantle pressures, growing consensus supported by experiments and theoretical firstprinciple calculations favors a picture of k increasing across both the upper (e.g., Xu et al, 2004) and lower mantle (e.g., Goncharov et al, 2010) with values at the CMB ranging from 6 W/mK (de Koker, 2010) to about 10 W/mK (Goncharov et al, 2010;Ohta, 2010;Tang and Dong, 2010) to even 20-30 W/mK (Hofmeister, 2008).…”

Section: Model Description Rheology and Materials Parametersmentioning

confidence: 99%

Influences of lower-mantle properties on the formation of asthenosphere in oceanic upper mantle

2011

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Asthenosphere is a venerable concept based on geological intuition of Reginald Daly nearly 100 years ago. There have been various explanations for the existence of the asthenosphere. The concept of a plume-fed asthenosphere has been around for a few years due to the ideas put forth by Yamamoto et al.. Using a two-dimensional Cartesian code based on finite-volume method, we have investigated the influences of lower-mantle physical properties on the formation of a low-viscosity zone in the oceanic upper mantle in regions close to a large mantle upwelling. The rheological law is Newtonian and depends on both temperature and depth. An extended-Boussinesq model is assumed for the energetics and the olivine to spinel, the spinel to perovskite and perovskite to post-perovskite (ppv) phase transitions are considered. We have compared the differences in the behavior of hot upwellings passing through the transition zone in the mid-mantle for a variety of models, starting with constant physical properties in the lower-mantle and culminating with complex models which have the post-perovskite phase transition and depth-dependent coefficient of thermal expansion and thermal conductivity. We found that the formation of the asthenosphere in the upper mantle in the vicinity of large upwellings is facilitated in models where both depth-dependent thermal expansivity and conductivity are included. Models with constant thermal expansivity and thermal conductivity do not produce a hot low-viscosity zone, resembling the asthenosphere. We have also studied the influences of a cylindrical model and found similar results as the Cartesian model with the important difference that upper-mantle temperatures were much cooler than the Cartesian model by about 600 to 700 K. Our findings argue for the potentially important role played by lower-mantle material properties on

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Effect of composition, structure, and spin state on the thermal conductivity of the Earth's lower mantle

Cited by 49 publications

References 33 publications

Reduced radiative conductivity of low spin FeO6-octahedra in FeCO3 at high pressure and temperature

Reduced radiative conductivity of low spin FeO6-octahedra in FeCO3 at high pressure and temperature

A flash heating method for measuring thermal conductivity at high pressure and temperature: Application to Pt

Influences of lower-mantle properties on the formation of asthenosphere in oceanic upper mantle

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