ABSTRACT
Along the Sikhote-Alin ridge of the Russian Far East, 30◦ to 50◦C thermal waters emerge in a series of sodium bicarbonate and sodium bicarbonate-sulfate type springs. Atmospheric nitrogen and oxygen are the dominant dissolved gases. Rare earth element data constrain understanding of water-rock interaction occurring in the source region. Thermal waters are of meteoric origin and the water exchange time is low according to the hydrogen and oxygen isotopic data and geochemical modelling. A conceptual model of groundwater evolution of Sikhote-Alin thermal waters is proposed.
