skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Radiative conductivity and abundance of post-perovskite in the lowermost mantle

Abstract

Thermal conductivity of the lowermost mantle governs the heat flow out of the core energizing planetary-scale geological processes. Yet, there are no direct experimental measurements of thermal conductivity at relevant pressure–temperature conditions of Earth's core–mantle boundary. Here we determine the radiative conductivity of post-perovskite at near core–mantle boundary conditions by optical absorption measurements in a laser-heated diamond anvil cell. Our results show that the radiative conductivity of Mg0.9Fe0.1SiO3 post-perovskite (~1.1 W/m/K) is almost two times smaller than that of bridgmanite (~2.0 W/m/K) at the base of the mantle. By combining this result with the present-day core–mantle heat flow and available estimations on the lattice thermal conductivity we conclude that post-perovskite is at least as abundant as bridgmanite in the lowermost mantle which has profound implications for the dynamics of the deep Earth.

Authors:
ORCiD logo; ; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Org.:
National Science Foundation (NSF)
OSTI Identifier:
1410120
Resource Type:
Journal Article
Journal Name:
Earth and Planetary Science Letters
Additional Journal Information:
Journal Volume: 479; Journal Issue: C; Journal ID: ISSN 0012-821X
Publisher:
Elsevier
Country of Publication:
United States
Language:
ENGLISH
Subject:
58 GEOSCIENCES

Citation Formats

Lobanov, Sergey S., Holtgrewe, Nicholas, Lin, Jung-Fu, and Goncharov, Alexander F. Radiative conductivity and abundance of post-perovskite in the lowermost mantle. United States: N. p., 2017. Web. doi:10.1016/j.epsl.2017.09.016.
Lobanov, Sergey S., Holtgrewe, Nicholas, Lin, Jung-Fu, & Goncharov, Alexander F. Radiative conductivity and abundance of post-perovskite in the lowermost mantle. United States. https://doi.org/10.1016/j.epsl.2017.09.016
Lobanov, Sergey S., Holtgrewe, Nicholas, Lin, Jung-Fu, and Goncharov, Alexander F. Fri . "Radiative conductivity and abundance of post-perovskite in the lowermost mantle". United States. https://doi.org/10.1016/j.epsl.2017.09.016.
@article{osti_1410120,
title = {Radiative conductivity and abundance of post-perovskite in the lowermost mantle},
author = {Lobanov, Sergey S. and Holtgrewe, Nicholas and Lin, Jung-Fu and Goncharov, Alexander F.},
abstractNote = {Thermal conductivity of the lowermost mantle governs the heat flow out of the core energizing planetary-scale geological processes. Yet, there are no direct experimental measurements of thermal conductivity at relevant pressure–temperature conditions of Earth's core–mantle boundary. Here we determine the radiative conductivity of post-perovskite at near core–mantle boundary conditions by optical absorption measurements in a laser-heated diamond anvil cell. Our results show that the radiative conductivity of Mg0.9Fe0.1SiO3 post-perovskite (~1.1 W/m/K) is almost two times smaller than that of bridgmanite (~2.0 W/m/K) at the base of the mantle. By combining this result with the present-day core–mantle heat flow and available estimations on the lattice thermal conductivity we conclude that post-perovskite is at least as abundant as bridgmanite in the lowermost mantle which has profound implications for the dynamics of the deep Earth.},
doi = {10.1016/j.epsl.2017.09.016},
url = {https://www.osti.gov/biblio/1410120}, journal = {Earth and Planetary Science Letters},
issn = {0012-821X},
number = C,
volume = 479,
place = {United States},
year = {2017},
month = {12}
}