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Table 12.1 Location, host-rock type, and hydrothermal fluid chemistry of the four CIR hydrothermal vent fields

From: Indian Ocean Hydrothermal Systems: Seafloor Hydrothermal Activities, Physical and Chemical Characteristics of Hydrothermal Fluids, and Vent-Associated Biological Communities

Hydrothermal field Dodo Solitaire Edmond Kairei
Location CIR-segment16 on-axis CIR-segment15 off-axis CIR-segment4 off-axis CIR-segment1 off-axis
Host-rock type E-MORB E-MORB N-MORB Troctolite + D-MORB
Depth (m) 2,745 2,606 3,270–3,303 2,420–2,452
Temperature (°C) 356 296 382 369
pH (25 °C) 3.2 4.8 ≤2.97–3.3 3.35–3.60
Cl (mmol/L) ~680 ~500 926–973 571–623
H2 (mmol/L) ~2.4 0.46 0.0556–0.1116 2.48–8.50
CH4 (mmol/L) ~0.02 ~0.05 0.233–0.415 0.123–0.203
CO2 (mmol/L) ~4 ~8 7.19–15.8 4.53–10.1
References 1 1 2, 3 2, 3, 4
  1. CIR central indian ridge, MORB mid-ocean ridge basalt, E-MORB enriched MORB, N-MORB normal MORB, D-MORB depleted MORB
  2. 1. Nakamura et al. (2012), 2. Gallant and Von Damm (2006), 3. Kumagai et al. (2008), 4. Van Dover et al. (2001)