Abstract
Pb/Ba ratios of barite from various origins (hot springs, banks in the Japan Sea and Kuroko-type or vein-type ore mines) vary from 10-5 to 10-1. When they are plotted against chloride concentrations of the barite-precipitating solutions, both expressed in logarithms, the ratios increase almost linearly with a decrease in those of the solutions. For their chloride concentrations except those of hot spring waters, NaCl-equivalent salinities of fluid inclusions in the barite were used as an approximation. This fact is possibly elucidated in terms of chloro-complexing of lead in thermal solutions.
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