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Table 2 Composition of the sampled fluids in the experiments (mmol/kg)

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

Experiment Time (h) pH25 °C a ΣCO2 b pH25 °C c pHin-situ d H2 ΣCO2 Cl Na K Mg Ca Si Fe Mn
250 °C 0 n.a. n.a. 4.9 6.0 0.003 396 1128 1036 0.08 n.d. 0.073 n.d. n.d. n.d.
43 6.3 0.9 3.7 4.1 0.010 161 1174 939 0.94 36.2 46.5 6.1 0.49 0.19
119 5.8 1.9 4.1 4.5 0.014 67 1168 951 0.89 40.4 39.7 4.4 0.56 0.15
452 6.6 1.0 4.3 4.7 0.004 35 1186 948 0.85 38.4 39.2 2.4 0.77 0.23
859 6.4 2.3 4.6 5.0 0.007 36 1178 937 1.24 37.2 48.7 2.1 0.85 0.24
1771 7.1 1.0 4.4 4.8 0.021 35 1186 820 0.88 36.4 43.6 1.6 0.93 0.24
2760 6.8 1.2 4.5 4.8 0.024 33 1175 949 0.95 36.4 48.8 3.5 0.97 0.25
350 °C 0 n.a. n.a. 4.9 7.2 n.d. 396 966 946 0.10 0.03 0.078 n.d. n.d. n.d.
90 6.1 1.9 3.8 5.6 6.0 176 971 902 0.78 1.2 39.4 3.7 1.53 0.71
258 6.4 1.7 3.9 5.6 2.8 163 968 882 0.86 1.2 38.0 3.7 1.80 0.73
594 6.4 1.7 3.9 5.6 2.9 179 963 877 0.98 1.1 42.2 3.6 1.65 0.67
1146 6.5 1.8 3.9 5.7 2.7 174 969 900 1.08 1.0 41.1 3.8 1.61 0.63
1530 6.6 1.7 3.9 5.7 2.2 171 953 884 0.81 1.0 37.3 4.1 1.55 0.60
  1. n.a., not analyzed
  2. n.d., not detected
  3. aMeasured pH after CO2 degassing
  4. bMeasured ΣCO2 concentration after CO2 degassing
  5. cCalculated pH25 °C at 1 bar before CO2 degassing at room temperature
  6. dCalculated pHin-situ at high-temperatures, 500 bars