Geochemical features and the flow system for saline mineral spring at the Tsuwano Town, Shimane Prefecture

Murakami, Hiroaki ; Tanaka, Kazuhiro*

This study examined the geochemical properties and the distribution of mineral spring water, river water and bubbling gas in the Tsuwano Town, Shimane Prefecture, Western Japan. In Tsuwano, high Na-Cl concentration groundwater is discharged with bubbling gas mainly composed of CO. The geochemical properties of mineral spring water, gas, hydrogen-oxygen isotopes and rare gas isotopes suggest that mineral spring water at Tsuwano possibly contains deep-seated fluid. In addition, the largest flux of the deep-seated fluid is found along active fault, suggesting that active fault acts as a path way for fluid upwelling. Furthermore, In Tsuwano, deep-seated fluid discharges along the Lake Ohara-West Yauneyama fault system and surface fracture.