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Table 2 Mineral assemblages and physical properties of inferred lithologies for sub-IBM crust and mantle

From: Evolution of the Earth as an andesite planet: water, plate tectonics, and delamination of anti-continent

Layer Middle crust Lower crust Upper mantle
Composition 1:1 mixture 3:2 mixture 7:3 mixture Basalt Restite Restite + 10 % olivine Harzburgite
Depth (km) 5 8.5 11 5 9 11 5 10 11 11 12 20.5 25 25 27 40 25 30 40 40 50 70
T (°C) 300 380 430 300 390 430 300 410 430 430 450 650 750 750 780 970 750 820 970 970 1113 1400
Quartz 31.7 31.6 31.9 26.9 26.8 27.0 22.0 21.8 22.0 6.2 6.3 7.2 7.3 1.5 2.6 4.1       
Plagioclase 34.8 34.8 33.6 36.8 37.0 35.9 38.8 38.8 38.1 45.3 44.5 34.4 32.2 36.6 32.2 26.0 20.4 17.1 17.1    
Alkali feldspar 4.5 4.5 4.5 3.8 3.7 3.8 3.1 3.0 3.1 0.7 0.7 0.7 0.7 0.2 0.2 0.2 0.2 0.2 0.2    
Hornblende 22.0 22.0 22.1 22.2 22.2 22.3 22.5 22.5 22.6 23.4 23.4 24.2 24.4          
Garnet   0.4 2.3   0.2 1.9   0.4 1.4   1.4 19.3 20.5 27.1 32.1 33.5 34.6 36.8 37.0    
Olivine                     80.0 80.0 80.0
Orthopyroxene 5.1 4.8 3.5 6.9 6.9 5.7 8.8 8.6 7.9 14.9 14.0 0.0 0.0 4.3    8.4 7.2 6.7 20.0 20.0 20.0
Clinopyroxene 1.3 1.3 1.4 2.6 2.6 2.7 4.1 4.1 4.2 8.7 8.9 13.3 14.4 29.8 32.3 35.6 35.6 37.7 38.5    
Ilmenite 0.6 0.6 0.6 0.7 0.7 0.7 0.7 0.7 0.7 0.9 0.9 0.9           
Rutile              0.5 0.6 0.6 0.6   0.5 0.5    
ρ (g/cm3) 2.92 2.93 2.95 2.96 2.96 2.98 3.00 3.00 3.01 3.11 3.12 3.27 3.26 3.35 3.38 3.40 3.46 3.46 3.46 3.25 3.24 3.20
V P (km/s) 6.50 6.51 6.54 6.57 6.56 6.59 6.63 6.63 6.65 6.82 6.85 7.13 7.14 7.33 7.45 7.48 7.60 7.64 7.62 7.86 7.81 7.51
V S (km/s) 3.82 3.81 3.82 3.82 3.80 3.82 3.82 3.80 3.81 3.80 3.82 3.98 3.99 4.06 4.12 4.14 4.23 4.25 4.23 4.49 4.44 4.22
Poisson’s ratio 0.24 0.24 0.24 0.24 0.25 0.25 0.25 0.25 0.25 0.27 0.27 0.27 0.27 0.28 0.28 0.28 0.27 0.28 0.28 0.26 0.26 0.27