Colloids in the hydrothermal-magmatic systems of Kamchatka and the Kuril Islands

摘要

Metacolloids in active hydrothermal systems began to be investigated in the 1960s. Currently, several hydrothermal-magmatic systems associated with stratovolcanoes have been explored in Kamchatka and the Kuril Islands. The water-volcanic reaction leads to the formation of silicate and sulphide colloids. Silicate colloids are a geological and geochemical factor that changes the permeability of host rocks, the temperature regime, the chemical properties of thermal waters and affects the formation of ore deposits. The accumulation of heat and non-reactive gases under impermeable layers leads to an increase in temperature and is accompanied by partial melting of siliceous rocks with the formation of ignimbrites and foci of acid magmas.