Fig. 2: The low-temperature hydrothermal (LTH) system.
From: New isotope constraints on the Mg oceanic budget point to cryptic modern dolomite formation
a Schematic illustration of ridge-flank hydrothermal circulation and its effect on temperature, T, and Mg concentration, [Mg] (after Fisher and Wheat29). The sediment cover has low permeability relative to the basalt that comprises the upper permeable portion of the basaltic basement35. b Concentration of Mg vs. temperature at the sediment-basement-interface (SBI) in LTH fluids (data from Wheat et al.34,36,37,39, Fisher et al.38, and Fisher and Wheat29 and references therein). Blue-dashed line (SW) is seawater Mg concentration (~53 mmol kg−1). Gray-solid line (H&S) is a modeled temperature dependence taken from Higgins and Schrag20.
