Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 106, Issue 52, Pages 22119-22123Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.0905920106
Keywords
lowermost mantle; phase transition; seismic velocity; thermal structure
Categories
Funding
- Japan Society for the Promotion of Science (JSPS) [19740272, 20001005, 21740379]
- Ehime University
- Grants-in-Aid for Scientific Research [20001005, 19740272] Funding Source: KAKEN
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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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