Extended Data Table 3.

Temporal variations in dissolved species in fluids (in M), with pH at the calculated in-situ pH at 150 °C and 30 MPa

Analytical errors are shown in parentheses. For P concentrations, the values of “P” are the results of total dissolved P in fluids measured using a tandem inductively coupled plasma mass spectrometer (ICP–MS/MS); and those of “PO₄” are the results of ΣPO₄³⁻ measured using ion chromatography (see Methods 3a). In cases where element concentrations were too low to be measured (i.e., Mg and Al), the upper limits of concentration (detection limits) are given.