Инд. авторы:	Lobanov S.S., Holtgrewe N., Lin J.-F., Goncharov A.F.
Заглавие:	Radiative conductivity and abundance of post-perovskite in the lowermost mantle
Библ. ссылка:	Lobanov S.S., Holtgrewe N., Lin J.-F., Goncharov A.F. Radiative conductivity and abundance of post-perovskite in the lowermost mantle // Earth and Planetary Science Letters. - 2017. - Vol.479. - P.43-49. - ISSN 0012-821X. - EISSN 1385-013X.
Внешние системы:	DOI: 10.1016/j.epsl.2017.09.016; РИНЦ: 31069220; SCOPUS: 2-s2.0-85032300362; WoS: 000415778600004;
Реферат:	eng: 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. © 2017 Elsevier B.V.
Ключевые слова:	Heat transfer; High pressure engineering; Iron compounds; Light absorption; Magnesium compounds; Perovskite; Silicon compounds; Diamond-anvil cell; High pressure; Laser-heated diamond anvil cells; Lattice thermal conductivity; Optical absorption measurement; Optical spectroscopy; Spin transition; Temperature conditions; Thermal conductivity; abundance estimation; core-mantle boundary; diamond anvil cell; high pressure; lattice dynamics; optical property; P-T conditions; perovskite; Calluna vulgaris; thermal conductivity; Electromagnetic wave absorption; thermal conductivity; spin transition; optical spectroscopy; high pressure; core–mantle boundary; diamond anvil cell; Experimental mineralogy;
Издано:	2017
Физ. характеристика:	с.43-49