Lattice thermal conductivity of MgSiO3 perovskite and post-perovskite at the core–mantle boundary

Ohta, Kenji; Yagi, Takashi; Taketoshi, Naoyuki; Hirose, Kei; Komabayashi, Tetsuya; Baba, Toshihide; Ohishi, Yasuo; Hernlund, J. W.

doi:10.1016/j.epsl.2012.06.043

Cited by 127 publications

(138 citation statements)

References 40 publications

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“…6). These values are comparable to the CMB heat flow of 5-15 TW estimated from the mantle side (Imada et al, 2014;Lay et al, 2008;Ohta et al, 2012).…”

Section: High Thermal Conductivity and Inferred Isentropic Heat Flow supporting

confidence: 80%

Electrical resistivity and thermal conductivity of hcp Fe–Ni alloys under high pressure: Implications for thermal convection in the Earth’s core

Gomi

Hirose

2015

Physics of the Earth and Planetary Interiors

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“…6). These values are comparable to the CMB heat flow of 5-15 TW estimated from the mantle side (Imada et al, 2014;Lay et al, 2008;Ohta et al, 2012).…”

Section: High Thermal Conductivity and Inferred Isentropic Heat Flow supporting

confidence: 80%

Electrical resistivity and thermal conductivity of hcp Fe–Ni alloys under high pressure: Implications for thermal convection in the Earth’s core

Gomi

Hirose

2015

Physics of the Earth and Planetary Interiors

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“…Ohta et al, 2012), which is comparable to the value of thermal conductivity in this study (10 Wm À1 K À1 ) and proposed value by Stacey (1992).…”

Section: Effects Of Strongly-depth-dependent Thermal Conductivitysupporting

confidence: 91%

Geoid and topography of Earth-like planets: A comparison between compressible and incompressible models for different rheologies

Shahraki

Schmeling

2013

Physics of the Earth and Planetary Interiors

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“…High-pressure experiments (Ohta et al, 2012) and molecular dynamics calculations (Ammann et al, 2014) indicate that the thermal conductivity of magnesium post-perovskite exceeds that of magnesium perovskite by 40-60% at lower mantle conditions. The post-perovskite phase is expected to be present in the coldest portions of the D"-region, i.e., below mantle downwellings, where the basal layer in Figure 1 is thinnest.…”

Section: Lower Mantle Superplumes and Cmb Heat Fluxmentioning

confidence: 99%

Mantle superplumes induce geomagnetic superchrons

Olson

Amit

2015

Front. Earth Sci.

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We use polarity reversal systematics from numerical dynamos to quantify the hypothesis that the modulation of geomagnetic reversal frequency, including geomagnetic superchrons, results from changes in core heat flux related to growth and partial collapse of the two seismically-imaged lower mantle superplumes. We parameterize the reversal frequency sensitivity from numerical dynamos in terms of average core heat flux normalized by the difference between the present-day core heat flux and the core heat flux at geomagnetic superchron onset. A low-order polynomial fit to the 0-300 Ma Geomagnetic Polarity Time Scale (GPTS) reveals that a decrease in core heat flux relative to present-day of ∼30% can account for the Cretaceous Normal Polarity and Kiaman Reverse Polarity Superchrons, whereas the hyper-reversing periods in the Jurassic require a core heat flux equal to or higher than present-day. Possible links between GPTS transitions, large igneous provinces (LIPs), and the two lower mantle superplumes are explored. Lower mantle superplume growth and collapse induce GPTS transitions by increasing and decreasing core heat flux, respectively. Age clusters of major LIPs postdate transitions from hyper-reversing to superchron geodynamo states by 30-60 Myr, suggesting that superchron onset may be contemporaneous with LIP-forming instabilities produced during collapses of lower mantle superplumes.

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Lattice thermal conductivity of MgSiO3 perovskite and post-perovskite at the core–mantle boundary

Cited by 127 publications

References 40 publications

Electrical resistivity and thermal conductivity of hcp Fe–Ni alloys under high pressure: Implications for thermal convection in the Earth’s core

Electrical resistivity and thermal conductivity of hcp Fe–Ni alloys under high pressure: Implications for thermal convection in the Earth’s core

Geoid and topography of Earth-like planets: A comparison between compressible and incompressible models for different rheologies

Mantle superplumes induce geomagnetic superchrons

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