Melting of Iron at Earth’s Inner Core Boundary Based on Fast X-ray Diffraction

Author:

Anzellini S.1,Dewaele A.1,Mezouar M.2,Loubeyre P.1,Morard G.3

Affiliation:

1. Commissariat à l’Énergie Atomique, Direction des Applications Militaires Île de France 91297 Arpajon Cedex, France.

2. European Synchrotron Radiation Facility, BP 220, F-38043 Grenoble Cedex, France.

3. Institut de Minéralogie et de Physique des Milieux Condensés UMR CNRS 7590, Université Pierre et Marie Curie, 75005 Paris, France.

Abstract

Hot Enough to Melt Iron Earth's core is divided into a fluid outer core and a solid inner core, both composed predominately of iron at extremely high pressures and temperatures. The boundary between these two regions is largely controlled by the melting point of iron at ∼330 GPa, which in turn influences heat transfer and geodynamo generation. Anzellini et al. (p. 464 , see the Perspective by Fei ) compressed iron in a laser-heated diamond anvil cell, tracking its structure and texture by using time-resolved x-ray diffraction as the pressure increased to 200 GPa. The melting curve suggests the possibility of high heat flux and partial melting at the core-mantle boundary.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

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