Deformation of Post‐Spinel Under the Lower Mantle Conditions

To study the viscosity of bridgmanite and ferropericlase aggregate, uniaxial compression deformation experiments on pre-synthesized post-spinel phase two-layered samples were conducted under top lower mantle pressure 1773 K utilizing DT-Cup apparatus. Up to strain 0.25 ± 0.05, observed comparable suggests dominates bulk without localization in periclase. The microstructures deformed show evidence a similar periclase with partitioning. Texture analyses indicate dominant slip plane (100), steady state fabric strength achieved within 0.12 0.01. current experiment has provided no about an onset ∼30 vol.% at strain. Our observations provide direct experimental verification controlled rheology low magnitude, which should be considered geodynamical models include compositional rheological evolution mantle.