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Table 1 Concentrations of selected aqueous species in M-vent and L-vent fluids and seawater

From: Microbial succession during the transition from active to inactive stages of deep-sea hydrothermal vent sulfide chimneys

  M-vent L-vent Seawater
  Measured Endmember  
Temperature 35 °C 231 °C 2 °C
pH (25 °C) 4.8 5.2 7.8
K+ (mmol/kg) 10.7 18.9 9.95
Ca2+ (mmol/kg) 18.5 19.7 9.98
Mg2+ (mmol/kg) 39.2 0 53.0
Cl (mmol/kg) 549 528 537
SO42− (mmol/kg) 22.2 0 27.7
∑H2S (mmol/L) 0.00042 6.3
∑CO2 (mmol/kg) 21.6 11.5 2.3
CH4 (μmol/L) 24 83
H2 (mmol/L) < 0.002 0.83
  1. The L-vent concentrations are extrapolated endmember values (see text), while the M-vent values are measured concentrations