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Title: Elasticity of ferropericlase across the spin crossover in the Earth’s lower mantle

Knowing the elasticity of ferropericlase across the spin transition can help explain seismic and mineralogical models of the lower-mantle including the origin of seismic heterogeneities in the middle to lowermost parts of the lower mantle1–4. However, the effects of spin transition on full elastic constants of ferropericlase remain experimentally controversial due to technical challenges in directly measuring sound velocities under lower-mantle conditions1–5. Here we have reliably measured both V P and V S of a single-crystal ferropericlase ((Mg 0.92,Fe 0.08)O) using complementary Brillouin Light Scattering and Impulsive Stimulated Light Scattering coupled with a diamond anvil cell up to 96 GPa. The derived elastic constants show drastically softened C 11 and C 12 within the spin transition at 40–60 GPa while C 44 is not affected. The spin transition is associated with a significant reduction of the aggregate V P/V S via the aggregate V P softening because V S softening does not visibly occur within the transition. Based on thermoelastic modelling along an expected geotherm, the spin crossover in ferropericlase can contribute to 2% reduction in V P/V S in a pyrolite mineralogical model in mid lower-mantle. Our results indicate that the middle to lowermost parts of the lower-mantle wouldmore » exhibit enhanced seismic heterogeneities due to the occurrence of the mixed-spin and low-spin ferropericlase.« less
Authors:
 [1] ;  [1] ;  [2] ;  [3] ;  [3]
  1. Univ. of Texas, Austin, TX (United States). Department of Geological Sciences, Jackson School of Geosciences
  2. Univ. of Texas, Austin, TX (United States). Department of Geological Sciences, Jackson School of Geosciences; Center for High Pressure Science and Technology Advanced Research, (China)
  3. Institute for Study of the Earth's Interior, Misasa, Tottori (Japan)
Publication Date:
OSTI Identifier:
1240833
Grant/Contract Number:
AC02-06CH11357; NA0002006
Type:
Accepted Manuscript
Journal Name:
Scientific Reports
Additional Journal Information:
Journal Volume: 5; Journal ID: ISSN 2045-2322
Publisher:
Nature Publishing Group
Research Org:
Univ. of Chicago, Argonne, IL (United States); Carnegie Institution of Washington, Washington, D.C. (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); USDOE National Nuclear Security Administration (NNSA)
Country of Publication:
United States
Language:
English
Subject:
geophysics; techniques and instrumentation; 58 GEOSCIENCES