Hydrogeochemistry of Thermal Springs at Ebeco Volcano (Kuril Islands)

Abstract

Five contrasting types of waters were distinguished at Ebeco volcano, Paramushir Island, northern Kuriles. All these waters have different mineralization, macro- and microcomponent compositions. Solutions at fumarolic fields have the largest part of magmatic component; crater lakes consist mainly of meteoric waters. The REE content in boiling pots and springs of the Yurieva River is one order higher than in crater lakes or cold streams. The difference between REE distribution (Eu-minimum in crater lakes and cold springs and no Eu-minimum in waters of hot springs) witnesses to significant portion of hypogene fluids in hot hydrothermal manifestations. Solid phases precipitated in and around boiling pots and hot springs are mainly silica group minerals, hydrous silicates and hydroxyl-silicates of aluminium. Significant amount of precipitates may form in cold crater lakes, and this process causes gradual decrease of water mineralization.