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