Extended Data Fig. 3: Effects of Ca dissolution on crystal structure of bridgmanite.
From: Calcium dissolution in bridgmanite in the Earth’s deep mantle
a,b, The molar volumes of bridgmanite (Brg) at high pressures and 300 K. The red and blue symbols represent Ca-rich Brg and Brg, respectively. The solid curves are fits of the solid symbol data points to the Vinet equation with fixed K0′ = 4. The data shown as open symbols were not used for fitting. The calculated molar volume of the Brg + CaSiO3 perovskite (CaPv) assemblage is plotted as the dashed black curve for comparison with uncertainties (the grey shade). a, The blue dashed curve is from Mg,Fe,Al-bearing Brg in KLB-1 peridotite2. b, The inset is a magnified view for the purple triangles. c,d, The octahedral tilting of Brg at high pressures and 300 K. The octahedral tilting angle for MgSiO3 endmember Brg is shown as the black dashed line. d, The red circles (K62 and K100) and diamonds (K59B and K73B) denote Ca-rich Brg. The blue circles (K33) and diamonds (K59B and K73B) denote Brg. b,d, The purple triangles represent the data points of Ca-rich Brg observed together with CaPv in XRD patterns (K100-2; Methods). The error bars are estimated 1σ uncertainties.
