Paromay thermal springs of Sakhalin Island: modern state and prospects for use

Реферат PDF Rus The paper presents the results of modern studies of physical and chemical features of littleknown Paromay thermal springs in the north of Sakhalin Island, obtained during field works in November 2018 and October 2019. There were no significant changes in the thermal spring physical and chemical features in comparison with the previous studies of 1951 and 1953. Several thermal springs with a temperature up to 32 °C are on a small plot in the floodplain of the Paromay River. By chemical composition Paromay springs belong to fresh (mineralization up to 0.68 g/l), slightly alkaline (pH 7.3–7.5), hydrogen carbonate-chloride sodium waters. Gas composition of thermal springs mainly consists of nitrogen (61.4 %) and methane (31.6 %), which are not typical to other thermal springs of North Sakhalin, in which the methane dominates. The measurements of volumetric activity of subsoil radon–222 in the area of thermal springs do not reveal abnormal concentrations; values of OA Rn 58–83 Bq/m are comparable to other manifestations of thermal and mineral waters of the island. Computed by complex geothermal meters (Na–K, K–Mg, Na–Li, Mg–Li, SiO2) the temperatures of deep water reservoir are 30–40 °C, which corresponds to thermal spring formation depth of 1–1.5 km. Paromay thermal waters can be used as drinking water and for balneological application.