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Journal Articles Proceedings of the National Academy of Sciences of the United States of America Year : 2009

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.

Dates and versions

insu-03604882 , version 1 (10-03-2022)

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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 of the United States of America, 2009, 106, pp.22119-22123. ⟨10.1073/pnas.0905920106⟩. ⟨insu-03604882⟩
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