2021 Annual Meeting of Japan Association of Mineralogical Sciences (JAMS)
Sep 15 - Sep 19, 2021Online
2021 Annual Meeting of Japan Association of Mineralogical Sciences (JAMS)
Sep 15 - Sep 19, 2021Online
[R3-13]Density deficit of Earth’s inner core revealed by a multi-megabar rhenium pressure scale
*Eiji Ohtani1, Daijo Ikuta1, Hiroshi Fukui2,3, Tatsuya Sakamaki1, Daisuke Ishikawa4,3, Alfred Q Baron3,4(1. Tohoku Uni. Sci., 2. Uni Hyogo, Sci., 3. RIKEN, 4. JASRI)
Keywords:
primary pressure scale,high pressure,Earth’s core,density deficit,Inelastic X-ray scattering
We report the first primary pressure scale extending to the multi-megabar pressures of Earth’s core by measuring acoustic phonon velocities using inelastic X-ray scattering from a rhenium sample in a diamond anvil cell. Our new pressure scale agrees with previous primary scales at lower pressures and shock compression experiments, but previous scales have overestimated laboratory pressures by 20% at 230GPa. Our new scale suggests the density deficit of the inner core is ~9%, doubling the light-element content of the inner core.