Arima hot springs

Arima hot springs are located at middle Honshu. The geology of this area is composed of upper Cretaceous, and Paleogene granitic rocks. 

The Arima hot spring waters are classified into three types (1) Na-Ca-Cl type brine which is high in salinity and CO2 and medium to low in temperature (2) highly saline Na-Ca-Cl-type water of high temperature and low CO2 concentration and (3) dilute and C02-rich water of low temperature (Table 2.8). 

Sulfide minerals (galena, sphalerite, pyrite) were reported by Nakamura and Maeda (1961). 

Chemical composition of geothermal water associated with base-metal deposits (White, 1967) 

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Nakamura, H. and Maeda, K. (1961) Thermal waters and hydrothermal activities in Arima hot spring area, Hyogo Prefecture (Japan). Japan Geol Surv. Bull, 12, AKl-VJl. 

Base-metal (Pb, Zn, Cu) mineralizations were reported from Okuaizu, Nigorikawa, Arima and Ibusuki geothermal areas as scale products and precipitates from hot springs. Gold precipitations from hot springs are known from the Osorezan volcano and Beppu. 

Saiki, T., Kimura, R., and Arima, K. (1972) Isolation and characterization of extremely thermophilic bacteria from hot springs. Agric, Biol Chem., 36, 2357-2366. 

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