Geochemical study of Arima hot-spring waters, Hyogo, Japan, by means of tritium and deuterium.

Tanaka Kiriko, Koizumi Morito, Seki Riki, Ikeda Nagao

doi:10.2343/geochemj.18.173

Geochemical study of Arima hot-spring waters, Hyogo, Japan, by means of tritium and deuterium.

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Tanaka Kiriko

Institute of Chemistry, Tsukuba University
Koizumi Morito

Institute of Chemistry, Tsukuba University
Seki Riki

Institute of Chemistry, Tsukuba University
Ikeda Nagao

Institute of Chemistry, Tsukuba University

説明

Tritium, deuterium and chloride concentrations in the Arima hot spring waters were measured as a clue to their origin and subsurface behavior. T-D-Cl^- relationships clearly indicate that the saline brine of deep origin (T = 0 TR, δD = -30‰ and Cl^- = 43 g/l) is mixed with young meteoric water having T = 30 TR, δD = -50 ‰ and Cl^- = 0g/l in varying proportions to form a group of high chloride hot spring waters. The young meteoric water in a shallow aquifer is also mixed with the older meteoric water in a deeper aquifer characterized by high tritium concentration (∼100TR), forming another group of low chloride waters. The mixing ratio of the two meteoric waters varies with season.