2:30 PM - 2:45 PM
[SMP44-04] Relation of high-temperature acid hot-springs to volcanoes
Keywords:acid hot springs, volcanoes, geochemistry
Acid hot-spring waters exhibit contribution of low-temperature meteoric water to high-temperature magmatic fluids more than 80% based on isotopic compositions, the value which is necessary to form liquid-dominated discharges. Acid hot springs seem to interact fully with rocks, situating at a transitional point in progress from dissolution to neutralization stages. Acid SO4-Cl type waters are classified into HCl-dominated and SO4-dominated waters, probably indicating reduced and oxidized conditions of waters at deep depths, respectively. Geothermometers applied to acid hot-spring waters might suggest acid water reservoirs where mixing between magmatic fluid and meteoric water promote water-rock interaction through dissolution and dissociation of gaseous components.
Referring these lines of consideration, potential resources and tasks to be solved in future for thermal energy exploitation will be discussed.