Fig. 2: Isothermal compression curves predicted by ab initio calculations for (Mg0.5Fe0.5)(Si0.5Fe0.5)O3 and (Mg0.5Fe0.5)(Si0.5Al0.5)O3 bridgmanite.
From: Formation of large low shear velocity provinces through the decomposition of oxidized mantle
a (Mg0.5Fe0.5)(Si0.5Fe0.5)O3 bridgmanite, b (Mg0.5Fe0.5)(Si0.5Al0.5)O3 bridgmanite. The blue, green, orange, and red curves are calculated compression curves of (Mg0.5Fe0.5)(Si0.5Fe0.5)O3 and (Mg0.5Fe0.5)(Si0.5Al0.5)O3 bridgmanite at 300, 1000, 2000, and 3000 K, respectively. The blue squares are experimental measurements from Liu et al.36, which shows that the spin transition of Fe3+ in the B-site of (Mg0.5Fe0.5)(Si0.5Fe0.5)O3 bridgmanite occurs between 43 and 53 GPa at 300 K. The blue circles are experimental results of Zhu et al.42.
