Fluid Chemistry of Mid-Ocean Ridge Hydrothermal Vents: A Comparison between Numerical Modeling and Vent Geochemical Data

Table 1

Average MORB and seawater compositions integrated in the calculations of this study.

Average MORB composition^1		Seawater composition^2
	wt%		Solution (mol/kg)
SiO2	50.43	Na^+	0.469
TiO2	1.49	Mg^2+	0.0528
Al2O3	15.37	Ca^2+	0.0104
FeO	8.95	K^+	0.0102
Fe2O3	1.84	Cl^−	0.5467
MgO	7.58	SO4^2−	0.0282
CaO	11.53	HCO3^−	0.0017
Na2O	2.54	CO3^2−	2.4 × 10^−4
K2O	0.14	F^−	6.8 × 10^−5
S	0.13	OH^−	1.09 × 10^−4
Fe^3+/ΣFe	0.1563	CO2	9.5 × 10^−6
		H2O	53.5565
		pH	8.1

¹Average composition of eight MORB glasses from the East Pacific Rise, Mid-Atlantic Ridge, Galapagos Spreading Center, and Juan de Fuca Ridge (data after Kelley and Cottrell [55] and reference therein). ²Seawater composition modified from the reference composition of Millero et al. [56], defined at  = 25°C,  = 1 atm, and a salinity of 35 g/kg.