期刊
PHYSICS OF THE EARTH AND PLANETARY INTERIORS
卷 180, 期 3-4, 页码 148-153出版社
ELSEVIER
DOI: 10.1016/j.pepi.2010.02.002
关键词
Thermal conductivity; Lower mantle; Iron bearing Earth's minerals; Electronic spin transition; High pressure; Optical properties; Diamond anvil cell
资金
- NSF [EAR 0711358, 0738873]
- Carnegie Institution of Washington
- DOE/BES
- DOE/NNSA (CDAC)
- W.M. Keck Foundation
- French National Research Agency (ANR) [ANR-07-BLAN-0124-01]
- DOD-TACOM
- US Department of Energy, Office of Science, Office of Basic Energy Sciences [W-31-109-Eng-38]
- Directorate For Geosciences
- Division Of Earth Sciences [0755143, 0738873] Funding Source: National Science Foundation
The change in electronic structure of iron at high pressures to spin-paired states in ferropericlase, silicate perovskite, and post-perovskite may have a profound influence on the thermal conductivity of the lower mantle. Here, we present optical absorption data for lower mantle minerals to assess the effect of composition (including iron oxidation state), structure, and iron spin state on radiative heat transfer. We confirm that the presence of ferric iron in ferropericlase strongly affects the optical properties, while the effect of the spin-pairing transition may be more secondary. We also show that post-perovskite exhibits larger optical absorption in the near infrared and visible spectral ranges than perovskite which may have a profound effect on the dynamics the lowermost mantle. We present preliminary results from measurements of the phonon thermal conductivity of perovskite at 125 GPa using a pulsed laser heating technique. The available data suggest a larger value than what previously estimated, although the uncertainty is large. (C) 2010 Elsevier B.V. All rights reserved.
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