Hydrochemistry of thermal waters in crystalline rocks of the Sikhote-Alin ridge, Far East of Russia

George Chelnokov,Ivan Bragin,Natalia Kharitonova,O Chudaev,R Millot,O Shouakar-Stash,Y Kharaka,R Harmon

doi:10.1051/e3sconf/20199807006

Abstract

Low-enthalpy thermal waters (30-50°C) of HCO3-Na and HCO3-SO4-Na types with nitrogen as a dominant associated gas discharge on the southern continental margin of the Russian Far East and traditionally are of great importance for recreation and balneology facilities. All studied thermal waters have meteoric origin and relate to Palaeocene granite intrusions. Based on the chemical characteristics and isotopic composition, thermal waters are divided onto “immature” thermal waters with a short residence time (3H=1.3±0.2TU), and “mature” thermal waters (3H=0.3±0.2TU) originated as a result of a longer evolution history (more than 60 years). The chemical composition of waters is largely determined by water-rock interactions, residence time and the local geothermal gradient.

Highlights

IntroductionAll geothermal manifestations occur within the Sikhote-Alin Ridge and relate to regional deep faults in crystalline rocks of different ages (Fig. 1) Most of thermal waters have been discovered as a result of drilling in 1930s - 1960s [1]
Low-temperature thermal waters of the continental margin of the Russian Far East are widespread along the coasts of the Sea of Japan and the Sea of Okhotsk
All geothermal manifestations occur within the Sikhote-Alin Ridge and relate to regional deep faults in crystalline rocks of different ages (Fig. 1) Most of thermal waters have been discovered as a result of drilling in 1930s - 1960s [1]

Summary

Introduction

All geothermal manifestations occur within the Sikhote-Alin Ridge and relate to regional deep faults in crystalline rocks of different ages (Fig. 1) Most of thermal waters have been discovered as a result of drilling in 1930s - 1960s [1]. Some groups of springs (Annensky, Tumninsky, Amgu, Chistovodny and Ulsky) are used by locals as spa for self-treatment. During the last two decades the geochemistry of these groups of springs has been studied [2,3,4,5,6]. We present the hydrochemical data for 5 groups of thermal springs of the Sikhote Alin Ridge combined with the analysis of geological and tectonic settings and discuss factors and processes controlling the origin of these waters

Location and geology

Hydrogeochemistry

Isotopic studies

Conclusions