Abstract
Abstract An estimation of the barium concentration in Tamagawa Hot Spring water was made on the basis of the partition of lead between spring waters and barite deposits precipitated from the waters. As the lead content of the waters and the chemical composition of the deposits are already known, the barium concentration can be computed by the use of the following relation: D=(\fracPbBa)S⁄(\fracPbBa)L where D is the partition coefficient of lead, and where S and L denote the solid and liquid phases respectively. A value of 2±1 mg./1. was obtained for the barium concentration in the water issuing from the vents. It was pointed out that the water is supersaturated with barium sulfate. This supersaturation may be due to the addition of a considerable amount of sulfates, probably formed by supergene processes, to the original thermal water. The genesis of hydrothermal barite deposits was also discussed.
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