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Temperature profile in the lowermost mantle from seismological and mineral physics joint modeling

Abstract : The internal structure of the core-mantle boundary (CMB) region of the Earth plays a crucial role in controlling the dynamics and evolution of our planet. We have developed a comprehensive model based on the radial variations of shear velocity in the D″ layer (the base of the lower mantle) and the high-P,T elastic properties of major candidate minerals, including the effects of post-perovskite phase changes. This modeling shows a temperature profile in the lowermost mantle with a CMB temperature of 3,800 ± 200 K, which suggests that lateral temperature variations of 200-300 K can explain much of the large velocity heterogeneity observed in D″. A single-crossing phase transition model was found to be more favorable in reproducing the observed seismic wave velocity structure than a double-crossing phase transition model.
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Submitted on : Thursday, March 10, 2022 - 4:39:32 PM
Last modification on : Saturday, March 12, 2022 - 3:32:32 AM

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Kenji Kawai, Taku Tsuchiya. Temperature profile in the lowermost mantle from seismological and mineral physics joint modeling. Proceedings of the National Academy of Sciences, 2009, 106, pp.22119-22123. ⟨10.1073/pnas.0905920106⟩. ⟨insu-03604882⟩

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