Journal
SCIENCE
Volume 351, Issue 6269, Pages 144-147Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.aad3113
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Funding
- NSF
- Directorate For Geosciences
- Division Of Earth Sciences [1361276, 1361463, 1520006] Funding Source: National Science Foundation
- Division Of Earth Sciences
- Directorate For Geosciences [1361327] Funding Source: National Science Foundation
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Rheological properties of the lower mantle have strong influence on the dynamics and evolution of Earth. By using the improved methods of quantitative deformation experiments at high pressures and temperatures, we deformed a mixture of bridgmanite and magnesiowustite under the shallow lower mantle conditions. We conducted experiments up to about 100% strain at a strain rate of about 3 x 10(-5) second(-1). We found that bridgmanite is substantially stronger than magnesiowustite and that magnesiowustite largely accommodates the strain. Our results suggest that strain weakening and resultant shear localization likely occur in the lower mantle. This would explain the preservation of long-lived geochemical reservoirs and the lack of seismic anisotropy in the majority of the lower mantle except the boundary layers.
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