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Table 1 Compositions of the synthetic komatiite, mineral/glass phases therein, starting materials used in a previous experiment (wt.%)

From: Reactions between komatiite and CO2-rich seawater at 250 and 350 °C, 500 bars: implications for hydrogen generation in the Hadean seafloor hydrothermal system

Sample Al-depleted komatiite Olivine Glass Spinel Basaltb
SiO2 46.29 41.02 50.74 0.22 49.84
TiO 0.37 0.00 0.68 0.22 0.73
Al2O3 4.30 0.20 7.74 6.43 15.82
Cr2O3 0.21 0.48 0.52 52.22
FeOtotal a 12.52 9.70 14.81 22.03 11.00
MnO 0.13 0.09 0.18 0.14 0.22
MgO 27.47 48.80 12.57 15.49 9.44
CaO 7.20 0.30 11.84 0.22 10.84
Na2O 0.06 0.00 0.23 0.00 1.88
K2O 0.02 0.02 0.05 0.02 0.18
NiO 0.11 0.34 0.01 0.22
Total 98.68 100.95 99.37 97.23 99.95
Mg#c 79.64 89.96 60.21 55.62 60.47
  1. –, no mention
  2. aTotal iron as FeO
  3. bSynthetic basalt used in Shibuya et al. (2013b)
  4. cMg# = [Mg / (Mg+Fe)] × 100