Abstract—
A weathering profile of phyllite shales with an original Ag concentration of 10–5 wt % (the average Ag concentration in the Earth’s crust is 7 × 10–6 wt %) was numerically simulated with the SELECTOR program package. Under oxidizing conditions, Ag occurs in the solutions dominantly in the form of the \({\text{Ag}}_{{({\text{aq}}{\text{.}})}}^{ + }\) cation and a few percent of the anion 
, at a total Ag concentration of ×10–6.4 mol/L. Under reduced conditions, the dominant ion is \({\text{Ag}}_{{({\text{aq}}{\text{.}})}}^{0}\), whose concentration is 10–8.19 mol/L. The mineral form of Ag throughout the whole vertical section is native silver.
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Kopeikin, V.A. Physicochemical Model of Silver Behavior in a Weathering Profile. Geochem. Int. 58, 746–752 (2020). https://doi.org/10.1134/S001670292006004X
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DOI: https://doi.org/10.1134/S001670292006004X