Suppl. 15.1 Estimated end-member chemical and isotopic compositions of hydrothermal fluid from Kairei and Edmond fields, summarized from Gallant and Von Damm (2006) and Kumagai et al. (2008).

Kairei
units / Kali* / Monju* / Fugen* / Daikoku* / Bishamon* / 4** / 5** / 6**
depth / m / 2450 / 2420 / 2420 / 2443 / 2432 / 2422 / 2448 / 2452
pH / 3.4 / 3.6 / 3.4 / 3.4 / 3.4 / 3.35 / 3.51 / 3.44
Alk / mmol/kg / -0.456 / ± / 0.006 / -1.24 / ± / 0.040 / -0.288 / ± / 0.004 / -0.788 / ± / 0.015 / -1.090 / ± / 0.040 / -0.369 / ± / 0.004 / -0.222 / ± / 0.002 / -0.315 / ± / 0.003
Na / mmol/kg / 518 / ± / 15 / 484 / ± / 20 / 489 / ± / 19 / 489 / ± / 18 / 490 / ± / 26 / 492 / ± / 10 / 511 / ± / 10 / 528 / ± / 10
Ca / mmol/kg / 27.2 / ± / 0.8 / 25.6 / ± / 1.0 / 26.7 / ± / 1.0 / 25.9 / ± / 1.0 / 25.9 / ± / 1.2 / 28.6 / ± / 0.3 / 30.2 / ± / 0.3 / 31.3 / ± / 0.3
K / mmol/kg / 13.8 / ± / 0.6 / 12.8 / ± / 0.8 / 12.7 / ± / 0.7 / 12.7 / ± / 0.7 / 12.5 / ± / 0.8 / 13.3 / ± / 0.1 / 14.5 / ± / 0.1 / 15.2 / ± / 0.2
Si / mmol/kg / 16.0 / ± / 0.7 / 16.7 / ± / 0.9 / 16.8 / ± / 0.9 / 16.8 / ± / 0.9 / 16.9 / ± / 0.9 / 17.1 / ± / 0.2 / 16.7 / ± / 0.2 / 16.6 / ± / 0.2
Cl / mmol/kg / 623 / ± / 6 / 589 / ± / 7 / 606 / ± / 0.9 / 611 / ± / 7 / 595 / ± / 7 / 571 / ± / 2 / 595 / ± / 2 / 620 / ± / 2
SO4 / mmol/kg / -0.17 / ± / 0.02 / 0.93 / ± / 0.48 / -0.06 / ± / 0.02 / 6.93 / ± / 0.45 / -0.63 / ± / 0.39 / 0.48 / ± / 0.235 / 1.56 / ± / 0.14 / 0.76 / ± / 0.008
Fe / mmol/kg / 5.40 / ± / 0.25 / 3.67 / ± / 0.19 / 3.86 / ± / 0.20 / 3.86 / ± / 0.20 / 3.73 / ± / 0.20 / 3.54 / ± / 0.07 / 4.6 / ± / 0.05 / 6.01 / ± / 0.06
Mn / µmol/kg / 828 / ± / 35 / 848 / ± / 44 / 840 / ± / 43 / 828 / ± / 42 / 828 / ± / 48 / 811 / ± / 8 / 829 / ± / 8 / 857 / ± / 9
Sr / µmol/kg / 74.2 / ± / 3.3 / 66.5 / ± / 4.2 / 68.2 / ± / 3.5 / 66.7 / ± / 3.7 / 66.6 / ± / 0.3 / 70.3 / ± / 1.4 / 76.1 / ± / 1.5 / 79.6 / ± / 1.6
Ba / µmol/kg / 42.5 / ± / 2.3 / 10.6 / ± / 0.6 / 14.8 / ± / 0.8 / 9.54 / ± / 0.48 / 5.51 / ± / 0.29 / - / - / -
H2S / mmol/kg / 4.81 / ± / 0.17 / - / 6.40 / ± / 0.07 / 5.90 / ± / 0.07 / 6.06 / ± / 0.09 / 4.07 / ± / 0.12 / 3.97 / ± / 0.12 / 3.93 / ± / 0.08
CO2 / mmol/kg / 9.47 / ± / 0.47 / 8.57 / ± / 0.58 / 10.1 / ± / 0.70 / - / - / 4.53 / ± / 0.27 / 5.13 / ± / 0.31 / 4.76 / ± / 0.29
H2 / mmol/kg / 3.71 / ± / 0.14 / 2.48 / ± / 0.12 / 2.97 / ± / 0.15 / - / - / 8.19 / ± / 0.49 / 8.15 / ± / 0.49 / 7.89 / ± / 0.47
CH4 / µmol/kg / 123 / ± / 6 / 163 / ± / 11 / 202 / ± / 14 / - / - / 203 / ± / 12 / 191 / ± / 11 / 171 / ± / 10
δ13C(CO2) / ‰PDB / -5.3 / ± / 0.3 / -5.1 / ± / 0.3 / -5.1 / ± / 0.3 / - / - / - / - / -
δ13C(CH4) / ‰PDB / -9.8 / ± / 0.3 / -17.6 / ± / 0.3 / -18.0 / ± / 0.3 / - / - / - / - / -
Edmond
units / Nura Nura* / White head* / Huge Monk* / 2** / 10** / 12** / A**
depth / m / 3280 / 3290 / 3290 / 3300 / 3303 / 3273 / 3281
pH / 3.3 / 3.1 / 3.2 / ≤3.02 / ≤2.97 / 3.13 / 3.13
Alk / mmol/kg / -0.397 / ± / 0.006 / -1.34 / ± / 0.08 / -1.55 / ± / 0.1 / ≤-0.901 / ± / 0.009 / ≤-0.398 / ± / 0.004 / -0.532 / ± / 0.005 / -0.527 / ± / 0.005
Na / mmol/kg / 704 / ± / 14 / 713 / ± / 32 / 697 / ± / 32 / 698 / ± / 14 / 718 / ± / 14 / 733 / ± / 14 / 721 / ± / 14
Ca / mmol/kg / 58.5 / ± / 1.2 / 54.9 / ± / 2.3 / 55.3 / ± / 2.3 / 58.1 / ± / 0.6 / 64.9 / ± / 0.6 / 64.1 / ± / 0.6 / 63.4 / ± / 0.6
K / mmol/kg / 40.8 / ± / 1.2 / 41.5 / ± / 2.4 / 39.1 / ± / 2.3 / 44.7 / ± / 0.4 / 45.4 / ± / 0.4 / 44.6 / ± / 0.4 / 44.2 / ± / 0.5
Si / mmol/kg / 20.2 / ± / 0.6 / 19.6 / ± / 1.1 / 18.2 / ± / 1.1 / 20.3 / ± / 0.2 / 19.0 / ± / 0.2 / 21.0 / ± / 0.2 / 20.8 / ± / 0.2
Cl / mmol/kg / 946 / ± / 6 / 973 / ± / 15 / 928 / ± / 15 / 929 / ± / 3 / 926 / ± / 3 / 933 / ± / 3 / 927 / ± / 3
SO4 / mmol/kg / -0.300 / ± / 0.02 / -8.30 / ± / 0.8 / -2.19 / ± / 0.99 / -6.72 / ± / 0.4 / -0.385 / ± / 0.064 / 0.615 / ± / 0.012 / 0.415 / ± / 0.158
Fe / mmol/kg / 13.9 / ± / 0.4 / 11.5 / ± / 0.7 / 11.8 / ± / 0.7 / 10.5 / ± / 0.2 / 13.1 / ± / 0.1 / 13.6 / ± / 0.1 / 13.9 / ± / 0.1
Mn / µmol/kg / 1360 / ± / 40 / 1420 / ± / 80 / 1360 / ± / 80 / 1450 / ± / 10 / 1430 / ± / 10 / 1410 / ± / 10 / 1430 / ± / 10
Sr / µmol/kg / 181 / ± / 6 / 175 / ± / 11 / 177 / ± / 11 / 165 / ± / 3 / 182 / ± / 4 / 183 / ± / 4 / 184 / ± / 4
Ba / µmol/kg / 102 / ± / 3 / 49.7 / ± / 2.7 / 119 / ± / 7 / - / - / - / -
H2S / mmol/kg / 3.98 / ± / 0.03 / 1.83 / ± / 0.04 / 1.15 / ± / 0.03 / 1 / ± / 0.02 / 3.79 / ± / 0.08 / 4.66 / ± / 0.09 / 4.81 / ± / 0.10
CO2 / mmol/kg / 13.7 / ± / 0.5 / 9.95 / ± / 0.71 / 15.8 / ± / 1.1 / 9.72 / ± / 0.58 / 9.77 / ± / 0.59 / 9.84 / ± / 0.59 / 7.19 / ± / 0.43
H2 / mmol/kg / 0.1116 / ± / 0.0037 / 0.0556 / ± / 0.0031 / - / 0.0222 / ± / 0.0013 / 0.0391 / ± / 0.0023 / 0.249 / ± / 0.015 / 0.142 / ± / 0.009
CH4 / µmol/kg / 314 / ± / 12 / 283 / ± / 20 / 233 / ± / 16 / 415 / ± / 25 / 395 / ± / 24 / 381 / ± / 23 / 289 / ± / 17
δ13C(CO2) / ‰PDB / -5.4 / ± / 0.3 / -5.0 / ± / 0.3 / -5.8 / ± / 0.3 / - / - / - / -
δ13C(CH4) / ‰PDB / -13.5 / ± / 0.3 / -12.5 / ± / 0.3 / -13 / ± / 0.3 / - / - / - / -
* Kumagai et al. (2008), ** Gallant and Von Damm (2006)